Abstract
INTRODUCTION: Colorectal adenocarcinoma is the most common subtype of colon cancer and has lower rates of metastasis when compared to other subtypes (signet-ring and mucinous). 20% of Colorectal Cancer (CRC) cases have metastatic disease at the time of presentation. Metastasis are most frequently found in the liver, lung, peritoneum, bone and extra-regional lymph nodes. Reports involving metastatic disease to skeletal muscle are rare. CASE DESCRIPTION/METHODS: A routine screening colonoscopy of a 52-year-old female revealed an 8mm flat, umbilicated, and ulcerated polyp in the rectum. Subsequent staging CT scans showed a cystic fluid-filled cavity in the left psoas muscle. This cystic iliopsoas muscle lesion, initially diagnosed as an infected fluid collection, was subsequently identified as a metastasis from rectosigmoid adenocarcinoma. Following this diagnosis the patient underwent primary surgical resection for rectosigmoid carcinoma and received chemotherapy. DISCUSSION: This patient presented with a rare metastasis of rectosigmoid adenocarcinoma. This type of metastasis is significant not only for its rarity, but also in its negative prognostic features.
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