Case of Optic Nerve Involvement in Metastasis of a Gastrointestinal Stromal Tumor

The gastrointestinal stromal tumor (GIST) belongs to the leiomyosarcoma or leiomyoma group, and metastasis of leiomyosarcoma to the orbit is extremely rare. The most common sign of the metastasis of leiomyosarcoma to the orbit is proptosis; the primary lesion is usually found in skin or soft tissue.