Tenosynovial Giant Cell Tumor of the Clinoid: Rare Condition

BACKGROUND: A tenosynovial giant cell tumor (TGCT) is a rare type of tumor that primarily arises from the tendon sheath, synovium, and bursae. In rare cases, these tumors can affect joints of the head and neck such as the temporomandibular joint. This is the only case to our knowledge of an intracranial TGCT tumor of the clinoid. CASE DESCRIPTION: We present the case of a 25-year-old female with a 2-year history of progressively blurred vision in her left eye without visual field defects. She denied any headaches or symptoms referable to the left eye region. Past medical history was significant for meningitis at 10 months of age. Family history was noncontributory with no history of brain tumors. CONCLUSIONS: A tumor originating from the left anterior clinoid was found intraoperatively and confirmed by histology to be a TGCT.