耳下腺に発生した孤立性線維性腫瘍（solitary fibrous tumor）例

抄録

Solitary fibrous tumors (SFT) often occur as pleural lesions and are extremely rare in the parotid gland. In the present paper, we report a case of SFT occurring in the parotid gland. The patient was a 35-year-old woman admitted by a local doctor for further examination of a swelling in front of the left ear that the patient had first noticed three months earlier. She was referred to our institution for surgery, and we performed extirpation of the left parotid gland tumor (superficial cervical fascia) five months after her first visit to us. The surgery was performed by the usual method. Histopathology showed a hyperplastic spindle cell tumor with an edematous matrix, and positive results of immunohistochemistry for CD34, CD99, bcl-2, and STAT6. Based on the findings, the tumor was diagnosed as a SFT. A whole-body scan was subsequently performed, which revealed no pleural lesions or relapses. Latent SFT should be considered malignant, and followed up closely.