FIG. 2.

Comprehensive imaging and SRS treatment for recurrent skull base AcCCs. Radiosurgical planning for the cavernous sinus and pterygopalatine fossa lesion, showing a prescription dose of 20 Gy to the 40% isodose line (yellow line), and 16, 12, and 8 Gy (green lines, A). Radiosurgical planning for the second SRS targeting the recurrent lesion in the right maxillary sinus, with a prescription dose of 20 Gy to a 40% isodose line (B). Radiosurgical planning image for the third SRS treatment targeting the lesion in the clivus, with a prescription dose of 20 Gy to a 50% isodose line (C). The lesions remained shrunk or diminished at the last follow-up, 148 months (D), 134 months (E), and 94 months (F) after SRS.