Primary pulmonary leiomyosarcoma is a rare malignant tumor of the lungs. A 79-year-old woman showed a mass of 9 cm in diameter in a chest X-ray and computed tomography (CT) scan. A malignant tumor was suspected and left lower lobectomy was performed. From pathological findings, pulmonary leiomyosarcoma was diagnosed. The disease stage was pT2N0M0, p0d0e0pm0 (p0), pIB. From histopathological findings, the tumor appeared to be high grade, but no recurrences have occurred 2 years postoperatively and surgical treatment was considered effective.
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