Objectives: To clarify the features of lipomas that had been operated on in Kitasato University Hospital (KUH) and diagnosed by reviewing a series of cases. Method: All patients having undergone tumor removal between January 2000 and December 2021. Patients were identified through pathology department records. Results: Ages ranged from 2 to 80 years, with an average age of 47.1 years. Lipomas were benign in 38 cases and malignant in 2 cases. All 38 lipomas required only surgery. In cases of

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... ma, 3 cases developed complications after surgery. In the cases of lipoma, although postoperative results were varied and changing, there were no recurrences. Conclusion: Clinical files were reviewed for 40 patients. Lipomas were benign in 38 cases and malignant in 2 cases. Complications after surgery were seen in 3 cases. Although treatment requires total removal, in some cases require preoperative or postoperative chemotherapy and radiotherapy.