case_images: PMC3166780_01
case_images: Axial section through the brainstem at the nerve root entry zone of the left trigeminal nerve with an illustration of the location of the 50% isodose line for gamma knife radiation treatment planning. This was the treatment location for the first and second gamma knife procedures.
case_images: CRIM2011-258910.001.jpg
case_images: PMC3166780_01_CRIM2011-258910.001.jpg
case_images: fig1
case_images: The patient elected to undergo GKRS which was performed with a Leksell model C gamma knife to the trigeminal nerve root entry zone with 201 cobalt sources (4 mm shot size) to a dose of 42 Gy prescribed to the 50% isodose line for a maximum point dose of 84 Gy (see Figure 1).
case_images: Axial section through the brainstem at the nerve root entry zone of the left trigeminal nerve with an illustration of the location of the 50% isodose line for the gamma knife radiation treatment planning. This was the location of treatment for his third course of treatment.
case_images: CRIM2011-258910.002.jpg
case_images: PMC3166780_01_CRIM2011-258910.002.jpg
case_images: fig2
case_images: The 3rd treatment was delivered a few millimeters distal from the previous target and was prescribed 20 Gy (with 4 mm shots) to the 50% isodose line (see Figure 2) for a maximum point dose of 40 Gy.