腹直筋に発生した顆粒細胞腫の1例

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  • A CASE OF GRANULAR CELL TUMOR IN RECTUS ABDOMINIS MUSCLE

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A case of granular cell tumor (GCT) in the rectus abdominis muscle is reported. A 39-year-old woman was admitted to our hospital because of abdominal pain and left lower abdominal swelling. By clinical examination, the tumor was observed to be elastic and hard and 3×2cm in the left lower abdomen. CT scan re-vealed bilateral ovarian cysts and a low density area in the left rectus abdominis muscle about 2cm in diameter. We performed an operation under a diagnosis of ovarian cysts and rhabdmyoma. Wedge resection of the ovaries was done and the rectus abdominis muscle tumor was resected with a sufficient margin. The tumor was elastic hard and 2.8×2.0×1.5cm in diameter. Histologically, tumor cells were PAS-positive granular eosinophilic cyotoplasm and resistant to diastase digestion. They were also immunoreactive to S-100 protein. Thus, a histological diagnosis of GCT in rectus abdominis muscle was established. GCT is a relatively rare tumor observed in soft tissue, and its origin is still unclear. A total of 23 cases of GCT in skeletal muscle, including our case, have been reported in Japan. Preoperative diagnosis and outcome from histological findings is difficult in these cases, and is necessary long-term follow-up.

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