A Rare Coexistence of Mesenteric Lymphangioma and Ulcerative Colitis, Obscuring the Right Cause of Symptoms.

Lymphangiomas are rare, cystic tumors representing congenital malformation of the lymphatic vessels. Mesenteric lymphangioma (ML) is a rare presentation of lymphangiomas. Misdiagnosis of ML can occur because of its rarity and resemblance to other entities. Ulcerative colitis (UC) is the most common type of inflammatory bowel disease (IBD), with an increasing incidence in pediatric populations. Here, we present a rare case of the coexistence of ML and UC. The uncommon radiological findings of ML can lead to overlooking UC; however, slight dissociation between clinical symptoms and radiological findings and the consequential decision to further investigations enabled us to reach an accurate diagnosis and avoid delaying the treatment of UC.