Hemorrhagic lymphangioma mimicking hemoperitoneum: MR imaging diagnosis.

Omental cystic lymphangioma is an uncommon malformation that occurs in children. The authors report the magnetic resonance (MR) imaging findings in a case of hemorrhagic cystic abdominal lymphangioma, which clinically mimicked a recurrent hemoperitoneum. They demonstrate the superiority of MR imaging relative to computed tomography and ultrasound in diagnosing large hemorrhagic cystic masses and differentiating them from free intraperitoneal fluid with multiplanar imaging and fluid characterization. This enables precise tumor localization and extension, aiding surgical resection.