Vascular tumor in the mediastinum.

Mediastinal venous hemangioma is a very rare neoplasm. Here, we describe our experience in treating a patient demonstrating such a tumor. The patient, a 23-year-old man, was admitted to our hospital because of a mediastinal cyst. A biopsy of the cystic wall was performed by Video-Assisted-Thoracic-Surgery, in April 1999. Clear serous fluid was found in the cyst, and it was thus incorrectly diagnosed to be a thymic cyst. The cyst continued to increase in size, and the patient began to show an increased temperature after being discharged. A resection of the tumor was performed in June 1999. The cyst was filled with bloody fluid and, according to the pathological analysis, was diagnosed to be a mediastinal venous hemangioma.