Intravenous Leiomyomatosis with Intracardiac Extension as a Rare Cause of Abdominal Pain in an Adult Patient: A Case Report.

Intravenous leiomyomatosis (IVL) is a rare and benign smooth muscle tumor that arises from intrauterine venules or the myometrium. We herein describe a 49-year-old woman with a history of myomectomy who developed abdominal pain. An intravascular mass with extension to the right atrium was detected in the inferior vena cava. The mass was surgically resected in a single stage under cardiopulmonary bypass. IVL features were indicated by subsequent histopathology. Postoperatively, the patient was diagnosed with massive pericardial effusion and treated with a pericardial window. At 3 months' outpatient clinical follow-up, she was asymptomatic. This case indicates that the diagnosis of IVL with extension to the heart should be kept in mind in patients presenting with abdominal pain.