A Rare Medullary Carcinoma of Jejunum
Abstract Introduction/Objective Medullary carcinoma of jejunum is an extremely rare condition. These tumors account for less than 0.04% of all colorectal cancers and less than 3 cases to date has been reported in the small intestine Methods/Case Report We present a case of 78-year-old woman with a celiac disease and collagenous colitis, chronic diarrhea, chronic anemia and 2.1 cm apple core lesion on mid to distal jejunum on CT leading to partial obstruction. Results (if a Case Study enter NA) Histologically tumor showed invasive carcinoma in a solid growth pattern with pushing border. The tumor cells were uniform, enlarged with prominent nucleoli and brisk mitotic activity. There was prominent inflammatory response within and around the tumor. Immunohistochemical stains were positive for CK7, CDX2 CK19, CKAE1-3 and negative for CD45, CK20, Chromogranin Synaptophysin, PAX-8. MLH1 &PMS2 showed loss of nuclear expression and MSH2 & MSH6 with Intact nuclear expression. Microsatellite instability was High (MSI- H) with instability in two or more microsatellite markers. Diagnosis of medullary carcinoma of jejunum was made. Conclusion Although the clinical manifestations can be consistent with signs of intestinal obstruction, often these rare tumors are discovered incidentally. Conditions such as celiac disease, Crohn’s disease, and other chronic inflammatory illnesses have been linked to contributing risk factors. Imaging and appropriate tumor markers have less role in diagnosis; however, biopsy is needed for definitive diagnosis. Even though the development of these tumors in the small bowel is rare, further enhancement of awareness can aid in the appropriate early detection and appropriate treatment modalities.