Transit thrombus entrapped in a patent foramen ovale.

We describe the case of a 39-year-old man with a diagnosis of inferior vena cava compression caused by metastases of a testicular seminoma, who developed massive pulmonary embolism. Emergency operation was performed because of acute hemodynamic deterioration. Preoperatively, a free-floating mass was seen echocardiographically in the right atrium. Intraoperatively, a thrombus entrapped in a patent foramen ovale with a short free-floating end in the left atrium and a long end in the right atrium was found in addition to the pulmonary emboli. The thrombus was removed, the foramen ovale was closed by direct suture, and pulmonary embolectomy was performed. Histological examination confirmed thrombi but no malignant tissue. Further diagnostic studies documented a malignant seminoma with paraaortic lymph node metastases giving rise to the thrombembolism. Three years after oncologic therapy, he is alive and free from recurrence of embolic and malignant disease.