A Case of Small Bowel Penetration due to Lymphangioma of Jejunal Mesenterium

We report a case of small bowel penetration due to lymphangioma of the jejunal mesenterium. The patient, a 1-month-old girl, was admitted with a complaint of vomiting and a palpable abdominal mass. Ultrasonography and computed tomography of the lower abdomen indicated an intraperitoneal cystic mass. The patient was diagnosed as having a mesenteric cyst, and surgery was performed. We found the tumor in the jejunal mesenterium and penetration of jejunum in the same region. The tumor was a multilocular cystic mass. Histopathological diagnosis revealed a cavernous lymphangioma. We considered the penetration of the jejunum probably to be due to the existence of subserosal lymphagioma. Lymphangioma of the small bowel is a relatively rare disease, and only 7 cases of lymphangioma of both the small bowel and its mesenterium have been reported in the Japanese literature. We discuss the clinical features of mesenteric lymphangioma.