術前診断が困難であった大腸神経鞘腫の1例

A case of colorectal schwannoma with difficult preoperative diagnosis

神経鞘腫は中枢神経や四肢に好発するが，消化管発生は少なく，なかでも大腸原発は極めてまれである。大腸神経鞘腫は内視鏡や他の画像検査でも特異的な所見がなく，術前診断は難しい。今回我々は，術前診断が困難であった大腸神経鞘腫の1例を経験したので報告する。

Although schwannomas tend to occur in the central nervous system and extremities, they rarely occur in the gastrointestinal tract, and primary colorectal schwannomas are extremely rare. We have experience with a woman in her 50s who had a colorectal schwannoma that was difficult to diagnose preoperatively. When a colorectal mass with well-defined borders, early and prolonged homogeneous contrast enhancement, and substantial FDG uptake is present, schwannoma should be included in the differential diagnosis.