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The patient underwent a surgery for the left CPA mass via the retrosigmoid approach, and a subtotal resection was done. The mass was gray-colored, fragile, and hypervascular. The dissection plane of the arachnoid membrane was not well delineated (A). The facial nerve (arrow) was identified and seemed to be swollen (B). An encasement of a vessel (curved arrow) by the mass was observed (C).
