Mesenteric cystic lymphangiomas in an 11-year-old female: A rare case report.

Mesenteric cystic lymphangiomas are a rare benign abdominal malformation of lymphatic vessels, with an estimated incidence of 1 per 250,000. Clinical presentation ranges from asymptomatic masses to acute abdominal pain. Diagnostic investigation includes ultrasound, abdominal computed tomography, or magnetic resonance imaging. Complete surgical excision is the recommended treatment. We present an 11-year-old female with abdominal cramps, and a 6-month history of gradually developing distension, constipation, and polyuria, without the occurrence of vomiting. Clinical examination revealed a soft, movable, painless abdominal mass with dullness on palpation. Ultrasound showed multi-cavity cystic masses in the abdomen, and a contrast-enhanced computed tomography scan revealed a large multi-cavity cystic mass involving most of the abdomen. A complete surgical excision was performed, and microscopic examination confirmed the diagnosis of mesenteric cystic lymphangioma. This case underscores the importance of considering mesenteric cystic lymphangiomas in the differential diagnosis of abdominal masses in pediatric patients, even in rarer age groups. Imaging aids in diagnosis and surgery planning. Complete excision curbs the risk of infection and recurrences.