Solitary fibrous tumor of thyroid: a case report with review of literature.

Solitary fibrous tumors are rare spindle cell tumors of mesenchymal origin most commonly found in the pleura and peritoneum. In contrast, extra-serosal locations are rare. We present a 41-year-old female with a progressively enlarging left-sided neck mass of one-year duration with subsequent rapid-onset growth over two months, and was pathologically confirmed to be a benign solitary fibrous tumor of the thyroid gland.