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Abdominal Wall Seeding of Colorectal Cancer at the Drainage Tube Site Detected by FDG-PET/CT

We herein described a 54-year-old male who received FDG-PET/CT imaging for re-staging of recurrent colorectal cancer. Except for the lesions in rectum, peritoneal spaces and liver, a small hypermetabolic lesion was incidentally noted at the subcutaneous area of left lower abdomen. Physical examination revealed a palpable nodule just beneath the scar of previous drainage tube site, consistent with the location of this hypermetabolic nodule. Surgical excision of the lesion was performed and pathology approved it to be metastatic adenocarcinoma of colorectal origin, compatible with a very rare complication of abdominal wall seeding secondary to previous procedure of percutaneous drainage tube placement. This case implicated the powerful and unique utility of FDG-PET/CT to detect a rare malignant process in an unexpected site.