Abstract
We report a case of superficial leiomyosarcoma that occurred on the buttocks of a 67 years old Japanese female. The lesion was breitbasig erythematous tumor, 11×10×2.5cm in size, with erosion, ulcer and fur on the surface and pigmentation around the tumor. Histopathologically, tumor cell nests were present in the upper dermis down to the subcutaneous fatty layer, near the fascia in some areas and the spindle cells with large atypical nuclei and eosinophilic cytoplasm were proliferating with a fascicular pattern. Abnormal mitoses were also observed. The diagnosis of superficial leiomyosarcoma was made hstopathologically, immunohistopathlogically and electron microscopically. A wide excision was performed at a margin of 3cm from the lesion. A part of the muscle under the tumor was removed. She has been free from recurrence or metastasis for 14 months after surgery. [Skin Cancer (Japan) 2005; 20: 154-157]
