Microvascular Decompression

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    Case 1. Intraoperative photograph. Right-sided lateral suboccipital approach exposing the tentorium (T) and the trochlear nerve (arrows) compressed by a branch of the SCA (a) and fixed by arachnoid adhesions (f) lateral to first exit zone. B = brainstem.

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    Case 2. Intraoperative photograph showing exposure of the left trochlear nerve (arrows) lateral to the first exit zone. The nerve is longitudinally compressed by at least two branches of the SCA (a), two of the three branches already being dissected away from the nerve. T = tentorium.

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