[A case of mediastinal angiomyolipoma].

A 53-year-old woman was referred to our hospital for further evaluation of a mediastinal tumor. The tumor was diagnosed as a mediastinal angiomyolipoma by computed tomography and angiographic findings. Transarterial embolization was performed three times, then the tumor was completely organized. Although angiomyolipomas are often found in the kidney, those in the mediastinum are very rare. Angiomyolipoma is a benign tumor, then small asymptomatic tumor may be conserved. When the tumor is large in size and has a high risk of spontaneous rupture, arterial embolization is valuable for treatment of the tumor.