Multisession CyberKnife Radiosurgery for Orbital Cavernous Hemangiomas.

Orbital cavernous hemangioma is a rare benign tumor that causes protrusion of the eye-ball and lowers visual acuity. Surgical resection is the first choice of treatment, however, it is challenging due to the anatomical structure of the orbit. Stereotactic radiosurgery (SRS) has become an established alternative treatment for any challenging microsurgery in the skull. Five cases of orbital cavernous hemangioma were successfully treated with multisession CyberKnife (Accuray, Sunnyvale, CA, USA) stereotactic radiotherapy. The tumor volume ranged from 0.2 cc to 11.9 cc, all of which decreased in size after treatment. The radiation prescription dose ranged from 24 Gy to 26.1 Gy with fractions of 5 or 6. Visual acuity was preserved in all cases. Thus, multisession CyberKnife radiotherapy for orbital cavernous hemangioma might be a safe and effective treatment option.