CASE HISTORY
An 86-year-old woman presented to our hospital with a chief complaint of epigastric pain. She had undergone ileocecal resection for ascending colon cancer 10 years previously (pT2N0M0StageI; TNM classification 8th ed.), and no recurrence was reported. In June 2022, she visited her local doctor, who referred her to our hospital after finding an encapsulated fluid retention and scattered small nodules in the abdominal cavity on computed tomography (Figure 1).