Question: A 47-year-old woman was hospitalized for a 6-month history of episodic right-sided abdominal pain, nausea, and vomiting. Pain episodes occurred every month on an average, lasted for few hours at a time, and required 3 hospital admissions. As symptoms progressed, she developed diarrhea, described as 3–4 episodes of loose, watery bowel movements per day. Her medical history included hypertension controlled with medications, hysterectomy, and cholecystectomy. Physical examination was significant only for mild tenderness on the right lower abdomen, with no hepatosplenomegaly, masses, or peritoneal signs. Liver function tests, amylase, and lipase levels were normal. Abdominal ultrasonography showed no biliary dilatation. Upper endoscopy and colonoscopy (with terminal ileal intubation) were normal. Abdominal computed tomography (CT; Figure A) showed thickening of the distal ileuma a few centimeters proximal to the ileocecal valve with mild dilation of mid distal ileum proximally. Fecal material was seen in the small bowel, indicative of stasis. A clinical diagnosis of fibrostenotic Crohn's disease involving the terminal ileum was made. She underwent laparoscopic resection of the terminal ileum and cecum. Gross specimen (Figure B) showed a strictured terminal ileal segment approximately 5-cm long (arrow), with a tortuous ileum with prominent mucosal folds. On sectioning (Figure C), several hemorrhagic foci (arrow) within the thickened bowel wall were seen. Microscopic examination (Figure D; stain: hematoxylin and eosin; original magnification, 10×) revealed thickened muscularis propria, lamina propria, and subserosa with benign endometrial glands and stroma located within the muscularis propria of the thickened segment. What is the diagnosis? See the Gastroenterology web site (www.gastrojournal.org) for more information on submitting your favorite image to Clinical Challenges and Images in GI. Endometriosis, defined as presence of functional endometrial glands and stroma in locations outside the uterus, can involve intraperitoneal or extraperitoneal sites. The most common site of involvement is the ovaries. It affects up to 5%–10% women of menstruating age.1Olive D.L. Schwartz L.B. Endometriosis.N Engl J Med. 1993; 328: 1759-1769Crossref PubMed Scopus (755) Google Scholar Typical symptoms include pelvic pain, infertility, and dyspareunia. Although symptoms of early disease are usually cyclical, occurring during menstruation, they may become persistent with progressive disease or with involvement of other organs. The diagnosis is based on a high clinical suspicion and a typical histology. Endometriosis of the gastrointestinal tract affects 3%–37% women with this condition and most commonly involves the rectosigmoid region.2De Ceglie A. Bilardi C. Blanchi S. et al.Acute small bowel obstruction caused by endometriosis: a case report and review of the literature.World J Gastroenterol. 2008; 14: 3430-3434Crossref PubMed Scopus (79) Google Scholar Less commonly, it involves other colonic segments, small bowel, or the appendix. Symptoms related to gastrointestinal involvement depend on the site of involvement and vary from abdominal pain, abdominal distention, tenesmus, constipation, and diarrhea. Endometriosis rarely affects mucosal surfaces making endoscopic biopsies insufficient for diagnosis.2De Ceglie A. Bilardi C. Blanchi S. et al.Acute small bowel obstruction caused by endometriosis: a case report and review of the literature.World J Gastroenterol. 2008; 14: 3430-3434Crossref PubMed Scopus (79) Google Scholar Terminal ileal involvement from endometriosis is uncommon and occurs in 1%–7% of all patients with intestinal endometriosis.2De Ceglie A. Bilardi C. Blanchi S. et al.Acute small bowel obstruction caused by endometriosis: a case report and review of the literature.World J Gastroenterol. 2008; 14: 3430-3434Crossref PubMed Scopus (79) Google Scholar Patients with terminal ileal involvement are usually young nulliparous women who present with intermittent or persistent abdominal pain. Patients with significant involvement of the terminal ileum, like our patient, can present with symptoms and imaging evidence of obstruction.3Orbuch I.K. Reich H. Orbuch M. et al.Laparoscopic treatment of recurrent small bowel obstruction secondary to ileal endometriosis.J Minim Invasive Gynecol. 2007; 14: 113-115Abstract Full Text Full Text PDF PubMed Scopus (20) Google Scholar In the setting of obstruction, medical therapy with danazol or gonadotropin releasing hormones serve only as temporizing measures,3Orbuch I.K. Reich H. Orbuch M. et al.Laparoscopic treatment of recurrent small bowel obstruction secondary to ileal endometriosis.J Minim Invasive Gynecol. 2007; 14: 113-115Abstract Full Text Full Text PDF PubMed Scopus (20) Google Scholar and definitive treatment requires surgical resection of the involved segment of the bowel. In conclusion, endometriosis should be considered in the differential diagnosis of a young patient presenting with terminal ileal disease mimicking Crohn's disease.
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