- Research article
- Open Access
Diffuse duodenal nodular lymphoid hyperplasia: a large cohort of patients etiologically related to Helicobacter pyloriinfection
BMC Gastroenterology volume 11, Article number: 36 (2011)
Nodular lymphoid hyperplasia of gastrointestinal tract is a rare disorder, often associated with immunodeficiency syndromes. There are no published reports of its association with Helicobacter pylori infection.
From March 2005 till February 2010, we prospectively followed all patients with diffuse duodenal nodular lymphoid hyperplasia (DDNLH). Patients underwent esophagogastroduodenoscopy with targeted biopsies, colonoscopy, and small bowel video capsule endoscopy. Duodenal nodular lesions were graded from 0 to 4 based on their size and density. Patients were screened for celiac sprue (IgA endomysial antibody), immunoglobulin abnormalities (immunoglobulin levels & serum protein electrophoresis), small intestine bacterial overgrowth (lactulose hydrogen breath test), and Helicobacter pylori infection (rapid urease test, and histological examination of gastric biopsies). Patients infected with Helicobacter pylori received sequential antibiotic therapy and eradication of infection was evaluated by 14C urea breath test. Follow up duodenoscopies with biopsies were performed to ascertain resolution of nodular lesions.
Forty patients (Males 23, females 17; mean age ± 1SD 35.6 ± 14.6 years) with DDNLH were studied. Patients presented with epigastric pain, vomiting, and weight loss. Esophagogastroduodenoscopy showed diffuse nodular lesions (size varying from 2 to 5 mm or more) of varying grades (mean score ± 1SD 2.70 ± 0.84) involving postbulbar duodenum. Video capsule endoscopies revealed nodular disease exclusively limited to duodenum. None of the patients had immunoglobulin deficiency or small intestine bacterial overgrowth or positive IgA endomysial antibodies. All patients were infected with Helicobacter pylori infection. Sequential antibiotic therapy eradicated Helicobacter pylori infection in 26 patients. Follow up duodenoscopies in these patients showed significant reduction of duodenal nodular lesions score (2.69 ± 0.79 to 1.50 ± 1.10; p < 0.001). Nodular lesions showed complete resolution in 5 patients and significant resolution in remaining 21 patients. Patients with resistant Helicobacter pylori infection showed no significant reduction of nodular lesions score (2.71 ± 0.96 to 2.64 ± 1.15; p = 0.58). Nodules partially regressed in score in 2 patients, showed no interval change in 10 patients and progressed in 2 patients.
We report on a large cohort of patients with DDNLH, etiologically related to Helicobacter pylori infection.
Nodular lymphoid hyperplasia (NLH) of the gastrointestinal tract represents a rare disease that is grossly characterized by the presence of numerous visible mucosal nodules measuring up to, and rarely exceeding, 0.5 cm in diameter . Histologically, hyperplasic lymphoid follicles with large germinal centres are seen in the lamina propria and superficial submucosa . There is enlargement of the mucosal B cell follicles caused by hyperplasia of the follicle centres; surrounded by a normal appearing mantle zone. Disease may involve the stomach, the entire small intestine, and the large intestine . NLH involving the colon can mimic a variety of polyposis syndromes and this may cause difficulties in diagnosis . Disease has been reported to cause pulmonary disease as well . The etiology is unknown. In children, NLH is often associated with viral infection or food allergy; tends to have a benign course and usually regresses spontaneously [6, 7]. The disease in adults is rare and poorly described . It has been suggested that NLH is a risk factor for both intestinal and extra intestinal lymphoma [9–11]. Approximately 20% of adults with common variable immunodeficiency are found to have NLH . Some patients have low or absent IgA and IgM levels, decreased IgG levels, susceptibility to infection, small intestine bacterial overgrowth, diarrhea with or without steatorrhea [13–16]. Giardia lamblia is often present in such patients [17–19]. There is also an association with familial adenomatous polyposis and Gardner's syndrome . It has also been reported in patients with human immunodeficiency virus infection . The disease may be associated with other pathologies, especially gastrointestinal malignancies . Except an isolated case of gastric nodular lymphoid hyperplasia, there are no published reports of association of NLH with Helicobacter pylori (H. pylori) infection . Here, we report on a large cohort of patients with NLH, etiologically related to H. pylori infection.
From March 2005 till February 2010, we prospectively followed all patients with diffuse duodenal nodular lymphoid hyperplasia (DDNLH). Patients had detailed history and physical examination. Complete blood counts and serum chemistry were done by standard techniques. Stool analysis was done for ova and parasites. Giardia lamblia infection was evaluated by examinations of concentrated, iodine-stained wet stool preparations; duodenal aspirates and duodenal biopsies. IgA endomysial antibodies were detected by indirect immunofluorescence assay. Serum immunoglobulin (IgG, IgA & IgM) were estimated by immunoturbidometry. Serum protein electrophoresis was performed by agarose gel electrophoresis and densitometry. Small intestine bacterial overgrowth was evaluated by lactulose hydrogen breath test. Patient underwent esophagogastroduodenoscopy (EGD), targeted gastric and duodenal biopsies, evaluation of H. pylori infection; colonoscopies with ileoscopy and video capsule endoscopy. Patients infected with H. pylori received 10 days sequential antibiotic therapy. Eradication of H. pylori was evaluated by 14C urea breath Test (14C UBT) 4 to 6 weeks after antibiotic therapy. Patients resistant to sequential therapy received second line antibiotic therapy. Follow up EGD's were performed at/after 6 months of antibiotic therapy to assess the status of the duodenal nodular lesions detected earlier.
Diffuse Duodenal Nodular Lymphoid Hyperplasia (DDNLH)
Nodular lymphoid hyperplasia was diagnosed when numerous mucosal nodules (2 to 5 mm or more) were visible on endoscopic examination of the gut mucosa and histological examination of the forceps punch biopsies from nodules was reported as NLH . NLH was characterized by presence of well-circumscribed nodes of lymphoid tissue in the lamina propria and/or superficial submucosa. These lymphoid collections showed presence of highly reactive germinal centres, numerous cell types, prominent vascularity and polyclonality as determined immunohistochemically . The extent of nodular lesions was evaluated by various imaging tools including esophagogastroduodenoscopy, colonoscopy with ileoscopy and video capsule endoscopy. Diffuse nodular lesions limited to duodenum were diagnosed as DDNLH.
EGD was performed by an experienced endoscopist (MSK 3) with video-esophago-gastro-duodenoscope (Olympus Evis Smartage Gastro GIF V70 Serial, Olympus Japan). Procedures were video-recorded and representative findings documented on high resolution images using software program. Endoscopic findings were recorded on a proforma. Duodenum was carefully examined for nodules (circumscribed elevated mucosal lesions varying in size from 2 mm to 5 mm or more). Nodular lesions in the postbulbar duodenum, second and third part were graded on a scale of 0 to 4, depending upon the size and density of nodules. Grading was done by 2 investigators (MSK 3/NSK), blinded to results, by reviewing EGD images and recorded video. Prior to actual grading, the scoring system was mutually agreed upon and any discrepancies were mutually discussed and sorted out. Normal duodenum (grade 0) showed prominent smooth closely spaced Valvulae conniventes (Kerckring's folds) without scalloping or nodules. Nodules around 2 to 3 mm in size and less than 20 in number in the region inspected were reported as grade1. Similar size numerous (>20) nodules which had not deformed the duodenal folds were reported as grade 2. Grade 3 nodular disease was seen as numerous large (2 to 5 mm) nodules carpeting the mucosa and causing mucosal fold invasion and deformity. Nodules which were more than 5 mm in size carpeting the whole duodenal mucosa and obscuring the mucosal folds were reported as grade 4. Multiple (6 or more) forceps biopsies were taken from nodules and the intervening mucosa for histology. Biopsy specimens were examined under light microscopy after staining with hematoxylin and eosin; Periodic Acid Schiff (PAS) and reticulin stains. Immunohistochemistry using CD3 & CD20 markers was performed to evaluate the cell (T & B cells) population in the lymphoid nodules. Biopsies were examined for viral inclusions and parasites especially Giardia lamblia . H. pylori infection was evaluated by rapid urease test (RUT) and at histology. For RUT, 2 forceps punch biopsies were taken from gastric incisura and embedded in agar gel urea-rich medium (HP test™, Allied Marketing Corporation, Kolkata, India) and read as per manufacturer's instructions. Multiple gastric biopsies (two from antrum; two from body and additional specimens from any visible endoscopic visible lesions, if needed) were taken and stained with Hematoxylin & Eosin to type and grade gastritis; Alcian blue to detect intestinal metaplasia and Giemsa stain for H. pylori detection and density [25, 26].
Colonoscopy with ileoscopy was performed by an experienced endoscopist (MSK) with video-colonoscope (Olympus Evis Smartage Colono CF V70L Serial, Olympus Japan). Forceps biopsies were taken from endoscopic abnormalities as well as terminal ileum.
Video Capsule Endoscopy
Small bowel video capsule endoscopy was performed on capsule endoscopy system, Rapid 5 UPG with help of Pillcam SB2 capsule (Given Imaging, Ltd. Israel). Video images were examined for presence and extent of nodular lesions in the small bowel.
Lactulose Hydrogen Breath Test
Small intestinal bacterial overgrowth was evaluated by analyzing breath hydrogen with Gastrolyzer (Bedfont Scientific Ltd. Rochester, Kent, England) after a challenge dose of lactulose (10 g) and breath samples collected at baseline and subsequent 20 minutes intervals for 3 hours. Positive diagnosis for small intestine bacterial overgrowth was made if the breath hydrogen showed 20 ppm rise above baseline within first 2 hours .
H. pylori eradication was done with sequential antibiotic therapy. Patients received pantoprazole, 40 mg, with amoxillin, 1 g, twice daily for 5 days followed by pantoprazole, 40 mg, clarithromycin, 500 mg, and tinidazole, 500 mg, twice daily for next five days . Following sequential therapy, patients received symptomatic treatment including pantoprazole 40 mg per day for next 4 weeks. Patients with resistant H. pylori infection to sequential therapy received 10 days second line therapy (pantoprazole 40 mg twice daily along with levofloxacin 750 mg and doxycycline 100 mg once daily). This antibiotic combination was based on H. pylori antibiotic sensitivity in this region (Khuroo et al unpublished data).
14C Urea Breath Test (14C UBT)
Eradication of H. pylori infection after antibiotic therapy was evaluated by 14C UBT using Heliprobe™ System 2000 (Kibion AB, Uppsala, Sweden). After an overnight fast, patient swallowed a 14C Urea Capsule (HeliCap™). After 10 minute wait, patient breathed in to a breath card (BreathCard™) till acid sensitive indicator changed color from orange to yellow suggesting adequate trapping of exhaled breath 14Carbon dioxide as lithium carbonate. Breath Card 14C activity was analyzed in a Geiger Muller Counter (Probe™) and H. pylori infection analyzed and presented on the display as Heliprobe TM grade 0 (not infected), 1 (Indeterminate) and 2 (Infected).
Written informed consent explaining the indications, adverse affects and alternatives was obtained from all patients before the procedures were carried out. The study protocol was submitted to the ethical committee of Digestive Diseases Centre and was approved. The study protocol conformed to good medical practice as defined in the Helsinki principles.
Comparisons of the categorical variables were analyzed using the Fisher's exact test. Comparisons of the continuous variables were analyzed using the Student's t-test. All values are expressed as mean ± SD and frequencies. The statistical analysis was carried out using SPSS for Windows (version 13.0). Two-tailed P values less than 0.05 were considered significant.
From March 2005 till February 2010, 44 patients with NLH of gastrointestinal tract were diagnosed. Two patients had disease limited to distal ileum as visualized at colonoscopy & ileoscopy. Another 2 patients had extensive disease involving duodenum, jejunum and ileum. These 2 patients had common variable immunodeficiency syndrome and one of them presented with superadded recurrent Giardia lamblia infection, Remaining 40 patients (Males 23, females 17; mean age ± 1SD 35.6 ± 14.6 years; age range 14 to 62 years) had diffuse nodular disease limited to duodenum and formed the study group (Table 1).
Dominant clinical presentation was epigastric pain, postprandial abdominal distension, vomiting and weight loss. Duration of symptoms varied from 6 months to 5 years (mean ± 1 SD 2.6 ± 1.2 years). Six patients presented with recurrent episodes of diarrhoea, while 4 patients complained of constipation. None of the patients had history suggestive of steatorrhea. Hemoglobin ranged from 6 g/dl to 12.5 g/dl (mean ± 1SD 9.5 ± 2.2 g/dl). Six patients had severe anemia (<6.0 g/dl), 22 patients had moderate anemia (6 to <8 g/dl) and 12 patients had mild anemia (8 to <10 g/dl). Haematological indices revealed iron deficiency anemia in all patients. None of the patients had megaloblastic anemia. Serum albumin ranged from 2.5 g/dl to 4.5 g/dl (mean ± 1SD 3.2 ± 1.1 g/dl). 8 patients had low serum albumin. Serum calcium levels were below normal in 10 patients. Immunoglobulin levels were within normal limits in 26 patients. 14 patients had elevated immunoglobulin levels (IgG in 6 patients, IgM in 5 patients, and IgA in 3 patients). Elevated immunoglobulin levels were less than 1.5 times of the upper limit of normal values. None of the patients had low immunoglobulin level. Serum protein electrophoresis showed normal electrophoretic pattern and none of the patients had M band pattern. None of the patients had small intestine bacterial overgrowth as assessed by lactulose hydrogen breath test. IgA endomysial antibodies were negative in all patients. Stool analysis revealed ova of Ascaris lumbricoides in 11 patients. All patients with Ascaris lumbricoides infection received anthelmintic therapy namely mebendazole 100 mg twice daily per oral for 3 days. None of the patients had Giardia lamblia infection as evaluated by examinations of concentrated, iodine-stained wet stool preparations; duodenal aspirates and duodenal biopsies.
EGD showed diffuse nodular duodenal lesions in all patients (Figure 1). Duodenal bulb showed smooth mucosa, devoid of nodules in all patients. Nodular lesions appeared just beyond the apex of the bulb and were prominently seen in the second and third part of the duodenum. Nodular lesions were graded as grade 1 in 4 patients, grade 2 in 10 patients, grade 3 in 20 patients and grade 4 in 6 patients (mean ± 1SD grade 2.7 ± 1.2). All patients showed distensible duodenal lumen and none showed luminal narrowing or stricture or stasis or ulcerations. Examination of stomach showed no endoscopic abnormality in 8 patients; linear erythematous antral gastritis in 20 patients; exudative fundic gastritis in 6 patients and atrophic gastritis in 4 patients. Two patients had diffuse ulcerative nodular lesions limited to the antrum. None of the patient had pyloric or duodenal ulcer. RUT was positive in all patients and H. pylori were seen in gastric biopsies in all patients. Density of H. pylori was moderate in 6 patients and heavy in 34 patients. Histology of gastric biopsies revealed chronic superficial gastritis in 24 patients, and chronic atrophic gastritis with intestinal metaplasia in 14 patients. Two patients with diffuse ulcerative nodular disease of antrum showed histologic features of low grade MALT lymphoma. Duodenal biopsies showed mature nodes of lymphoid follicles in lamina propria (Figure 2). These lymphoid collections showed presence of highly reactive germinal centres. In addition, lamina propria showed mild increase in lympho-mononuclear cells. H. pylori were infrequently seen on the duodenal mucosa and in small numbers. Duodenal biopsies lacked features of coeliac sprue namely blunted villi, increased crypt depth, increased crypt villous ratio and epithelial cell lymphocytosis. Immunohistochemistry showed polyclonality of the cellular infiltrate which excludes possibility of duodenal lymphoma. There were no viral inclusions or Giardia lamblia seen in the tissue specimens.
Video capsule endoscopy showed nodular lesions in the postbulbar duodenum, second and third part of duodenum (Figure 3). There was marked reduction in the number of nodular lesions around the duodeno-jejunal junction. There were no nodular lesions seen in the jejunum and ileum. Colonoscopy and ileoscopy was normal in all cases and biopsies of the terminal ileum did not reveal nodular lymphoid hyperplasia.
All patients received sequential antibiotic therapy. 14C UBT, done 4 to 6 weeks following antibiotic therapy, revealed eradication of H. pylori infection in 22 patients. Another 4 patients had H. pylori eradication following second line therapy. Remaining 14 patients had persistent H. pylori infection. Abdominal pain and vomiting showed improvement in 14 of the 26 patients in whom H pylori had been eradicated (p < 0.001) (Table 2). In contrast only 3 out of 14 patients with persistent H. pylori infection had improvement in symptoms (p = 0.22). Follow up duodenoscopies in 26 patients with H. pylori eradicated showed significant reduction of duodenal nodular lesions score (2.69 ± 0.79 to 1.50 ± 1.10; p < 0.001). Nodular lesions showed complete endoscopic and histological resolution in 5 patients and significant resolution in remaining 21 patients (Figure 4). Two patients with low grade MALT lymphoma showed endoscopic and histologic resolution of the disease, after H. pylori eradication. Patients with resistant H. pylori infection showed no significant reduction of nodular lesions score (2.71 ± 0.96 to 2.64 ± 1.15; p = 0.58). Nodules regressed in 2 patients, showed no interval change in 10 patients and progressed in 2 patients (Figure 5). Histology of nodules which had progressed over the follow up continued to show polyclonality and there was no suggestion of these nodules evolving in to lymphoma.
NLH of the gastrointestinal tract is a rare disorder, often reported with immune deficiency disorders and/or recurrent giardiasis [11–13, 15, 17–19]. The disease may be localized to a segment or may affect longer segments of bowel . In contrast to reported disease in literature, the cohort of patients described in this study had significant differences. Firstly the disease was often encountered and report of 40 cases from one centre in 5 years period is a testimony to that. Second the disease involvement was limited to postbulbar duodenum, second and third part and duodeno-jejunal junction. Duodenal bulb was spared and there was no involvement of jejunum and ileum. Third none of the patients included in this study had immune deficiency or giardiasis. There are several reports of large cohort of patients similar to described by us from Mexico [16, 29]. However, around half of such patients had hypogammaglobinemia.
Diarrhea and weight loss secondary to malabsorption has been the dominant symptom of NLH of small bowel as reported in the literature [1, 15, 30, 31]. Malabsorption is a common symptom in patients with immune deficiency with or without superadded recurrent giardiasis . In contrast our patients with DDNLH presented with epigastric pain and vomiting, clinically suggesting gastric stasis and obstruction. Only 6 of our patients presented with diarrhea which may suggest co-existent malabsorption. Weight loss, gastric symptoms, iron lack anemia, and hypoalbuminemia in our patients were mostly caused by selective and dominant involvement of the duodenal mucosa .
The pathogenesis of nodular lymphoid hyperplasia has been a matter of debate for long. Histology of these lesions demonstrates hyperplasic lymphoid follicles with mitotically active germinal centres. In immune deficiency states, the lymphoid hyperplasia is likely the result of an accumulation of plasma-cell precursors due to maturational defect in the development of B-lymphocytes [2, 29]. These cells attempt to compensate for functionally inadequate intestinal lymphoid function. Bacterial contamination of small intestines is often mentioned as an etiological factor for NLH . This is supported by regression of nodules following oral antibiotic therapy in some cases . Some investigators suggest that coeliac disease may be associated with NLH . However, NLH may occur in a whole spectrum of disorders without any abnormalities in immunoglobulins [33–35]. It is believed that NLH in absence of immune deficiency disorders may be related to immune stimulation of the gut lymphoid tissue.
H. pylori infection is etiologically associated with a number of gastroduodenal disorders. Acute infection causes neutrophilic gastritis with transient hypochlorhydria and subjects complain of epigastric pain and nausea . Chronic infection causes a wide variety of gastritis including chronic superficial gastritis, nodular gastritis and chronic atrophic corpus gastritis with metaplasia [37, 38]. H. pylori infection is strongly associated with peptic ulceration of duodenum and stomach [39, 40]. Chronic corpus atrophic gastritis with intestinal metaplasia caused by H. pylori infection is an initiating event in most cases of intestinal type adenocarcinomas stomach. In fact H. pylori infection is associated with both diffuse-type and intestinal-type gastric adenocarcinoma [40, 41]. Another entity which is etiologically related to H. pylori infection is gastric MALT lymphoma. The disease evolves through H. Pylori gastritis with mucosa associated lymphoid tissue (MALT), lymphoepithelial lesions, low grade B cell lymphoma and finally diffuse large B cell lymphoma [42–44]. There are no published reports of association of diffuse duodenal nodular lymphoid hyperplasia (DDNLH) with H. pylori infection.
A number of findings strongly pointed to H. pylori to be etiologically associated with DDNLH in our patients. All patients were infected with H. pylori infection. Patients in whom H. pylori were eradicated showed significant clinical response and regression/resolution of duodenal events. In contrast patients in whom H. pylori could not be eradicated showed persistence of clinical symptoms and persistence of duodenal nodular lesions. A number of earlier studies have suggested H. pylori as a possible cause of NLH [16, 29], but none has followed this lead and none has substantiated this association.
What could be the pathogenesis of DDNLH in our patients? All patients had heavy H. pylori infection with advanced changes in the stomach as evidenced by gastroscopic and histological findings. In fact 2 of our patients had low grade MALT lymphoma. However, the duodenal changes seen were not as a result of direct involvement by H. pylori, as the organisms were not consistently present in the duodenal biopsies. A number of nongastrointestinal tract diseases are possibly associated with H. pylori infection. Many of these associations are suggested to be related to the effects of H. pylori on coagulation and markers of systemic inflammation. We believe the duodenal lesions were as a result of immune stimulation of prolonged and heavy H. pylori infection . This was supported by elevated immunoglobulins in a number of patients in our series. Some extragastric disease states are particularly associated with H. pylori CagA-positive infections [46, 47]. DDNLH seen in our community may be related to high prevalence of such H. pylori infections in our community and this need to be explored further. We believe careful examination of post-bulbar and second part of duodenum at EGD and liberal use of duodenal biopsies in patients with heavy H. pylori infection in tropical countries is needed to define the impact of this disease.
Two of our patients who failed to eradicate H. pylori infection had disease progression. However, biopsies showed prominent lymphoid follicles with active germinal centres located in the mucosa and there was no suspicion of disease evolving in to lymphoma. NLH has special relationship with lymphoma [7–9]. The disease needs to be differentiated from lymphoma. The presence of highly reactive germinal centres, numerous cell types, prominent vascularity, and polyclonality as determined immunohistochemically are the most important features in the differential diagnosis with lymphoma. Lymphoid hyperplasia may be differentiated from follicular lymphoma presenting as lymphomatous polyposis by Bcl-2 immunostaining of follicular germinal centres. NLH may be a manifestation of extraintestinal lymphoma and disease regresses after extraintestinal lymphoma undergoes remission under chemotherapy . May patients with gastrointestinal lymphoma may present with NLH. Moreover, studies have shown that NLH itself may evolve in to lymphoma on long term follow up. The study period in our patients was not enough to define whether disease can evolve in to lymphoma. Long term follow up of these patients needs to be done to evaluate the malignant potential of this entity.
In summary, we report on 40 patients with DDNLH. Patients presented with intractable dyspepsia and esophagogastroduodenoscopy showed diffuse nodular lesions of varying grades involving postbulbar duodenum. None of the patients had immunoglobulin deficiency or small intestine bacterial overgrowth or positive IgA endomysial antibodies. All patients were infected with H. pylori infection. Sequential antibiotic therapy eradicated H. pylori infection in 26 patients. Follow up duodenoscopies in these patients showed significant reduction of duodenal nodular lesions score. Fourteen patients with resistant H. pylori infection showed no significant reduction of nodular lesions score. We believe DDNLH in our patients was etiologically related to H. pylori infection.
1. Mehnaaz S Khuroo, MBBS, MD (Pathology), Lecturer, Department of Pathology, Government Medical college, Srinagar, Kashmir, India; Formerly Consultant Pathology, Jawahir Lal Nehru Memorial (JLMN) Hospital Rainawari, Srinagar, Kashmir, India. E-mail: firstname.lastname@example.org
2. Naira S Khuroo, MBBS, FIMR (KFSHRC Riyadh), Consultant Radiology, Digestive Diseases Centre, Srinagar, Kashmir, India. E-mail: email@example.com
3. Mohammad S Khuroo, MBBS, MD, DM, FRCP (Edin), FACP, Master American College of Physicians (MACP, Emeritus), Consultant Gastroenterology, Digestive Diseases Centre, Srinagar, Kashmir, India. E-mail: firstname.lastname@example.org; visit at: http://www.drkhuroo.com
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Funding: This work was conducted at Digestive Diseases Centre, Srinagar, Kashmir, India and was supported by funds from "Dr. Khuroo's Medical Trust".
The authors declare that they have no competing interests.
Contribution by individual authors:
MSK 1 conceived the study; participated in the design of the study; reviewed pathology and performed the statistical work. NSK participated in the design of the study; performed the blind scoring of the endoscopic findings and helped drafting the manuscript. MSK 3 participated in the design of the study; performed the blind scoring of endoscopic findings; and drafted the manuscript. All authors read and approved the final manuscript.
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Khuroo, M.S., Khuroo, N.S. & Khuroo, M.S. Diffuse duodenal nodular lymphoid hyperplasia: a large cohort of patients etiologically related to Helicobacter pyloriinfection. BMC Gastroenterol 11, 36 (2011). https://0-doi-org.brum.beds.ac.uk/10.1186/1471-230X-11-36
- Pylorus Infection
- Nodular Lesion
- Small Intestine Bacterial Overgrowth
- Duodenal Biopsy