[A Case of Local Resection and Mesh Repair of the Abdominal Wall to Effectively Treat the Recurrence of Sigmoid Colon Cancer with Spontaneous Perforation in the Inguinal Hernia Sac].

A 79-year-old man presented with a painful palpable mass in his lower abdominal wall, measuring approximately 7 cm, that occurred 4 months after undergoing partial sigmoidectomy for sigmoid colon cancer perforation within the left inguinal hernia sac. The mass was diagnosed as a recurrent tumor of sigmoid colon cancer located in the left rectus abdominis muscle. Chemotherapy was initially considered for treatment; however, surgical resection of the tumor combined with abdominal wall reconstruction was ultimately selected because the tumor caused significant pain and impacted the quality of life of the patient. Metastases were not observed in other areas. Postoperative chemotherapy was administered, and the patient is currently alive without any signs of recurrence 1 year after surgery.