A Case of Resected Pulmonary Liposarcoma with Hamartoma

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Background. Liposarcoma most commonly arises in the extremities and retroperitoneum. Primary pulmonary liposarcoma is rare and there are very few cases accompanied by hamartoma. Case. A 62-year-old man was referred to our hospital because of an abnormal shadow on a chest X-ray film which showed decreased translucency in the left lower lung field. Chest CT and MRI showed a huge heterogeneous tumor with fat and soft tissue components expanding into the left thoracic cavity, suggesting liposarcoma. We attempted to perform tumor resection, however, the tumor was suspected to invade adjacent organs, thus we performed complete resection of the tumor with combined resection of the left lung and pericardium. The tumor was 21×15×8.5 cm in size. Histologically, most of the tumor consisted of a well-differentiated liposarcoma, except for some small white nodules diagnosed as hamartomas. No adjuvant therapy was performed and the patient has been well without recurrence for 2 years after the surgery. Conclusion. We described a rare case of completely resected primary pulmonary liposarcoma associated with hamartoma. Surgically complete resection is recommended for well-differentiated liposarcoma because of its good prognosis after surgery.