A 91-year-old woman was transferred for the management of a huge abscess of the right thigh. The abscess was of approximately 30 cm craniocaudal sized in computed tomography (Fig. 1A). Since the patient was very old, percutaneous catheter drainage (PCD) was performed without further evaluation. After PCD, the abscess improved significantly (Fig. 1B), however, after 4 months, the patient was transferred again due to abscess aggravation. In computed tomography, a mass in the cecum was adjacent to the abscess (Fig 1C). Colonoscopy was performed without bowel preparation. A 3 cm sized mass with central opening in the cecum was observed (Fig. 2A). Because cecal cancer was considered the cause of abscess, right hemicolectomy with lymph node dissection was performed. Histological findings of the resected specimen showed adenocarcinoma with extracellular mucin production of approximately 40% (Fig. 2B). Thus, the patient was diagnosed with mucinous adenocarcinoma without lymph node metastasis (pT4bN0). Although she had surgery, cancer recurred and died two months after the surgery.