Abstract
It is very rare for patients with colorectal cancer (CRC) to have skeletal muscle metastasis. Here we reported a 41 year-old male with CRC who was initially treated with surgical resection of tumor and was staged as T3N2M0. He was referred for FDG-PET/CT whole-body imaging due to elevating tumor marker but negative traditional work-ups. The FDG-PET/CT imaging localized a solitary hypermetabolic lesion in the muscle of left gluteal area and no other positive finding in the whole body images. Surgical exploration found a hard mass within the left gluteal muscle and pathological examination of the excised tumor approved it to be metastatic adenocarcinoma of colorectal origin. This case was still disease-free in the follow-up periods of more than 10 months and was concluded as a very rare case of recurrent CRC presenting as a solitary metastasis in gluteal muscle.
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