Partial Small Bowel Obstruction and Volvulus Due to B-cell Lymphoma in a Common Variable Immunodeficiency Patient.

This case report presents a 43-year-old female with a history of common variable immunodeficiency (CVID) and a recent diagnosis of mesenteric volvulus. The patient presented with symptoms of partial small bowel obstruction and was diagnosed with obstruction and mesenteric volvulus primarily affecting the proximal jejunum. During the exploratory laparotomy, a probable polyposis syndrome and a possible adenocarcinoma of the small bowel were identified. Pathological examination confirmed the presence of B-cell lymphoma in the proximal jejunum. The patient underwent treatment with rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisolone (RCHOP) chemotherapy and showed improvement in symptoms. The case highlights the increased risk of malignancies, particularly lymphomas, in individuals with CVID and the challenges in diagnosing and treating lymphoid neoplasms in this population.