Lobectomy of pulmonary metastasis of endometrial stromal sarcoma

Pulmonary metastasis of low-grade endometrial stromal sarcoma is rare. A 61-year-old woman visited our hospital due to an abnormal chest shadow. Computed tomograhy showed a mass that was composed of a cystic and solid lesion, in the right lower lobe. She had undergone a combination of a hysterectomy and adnexectomy for a low-grade endometrial stromal sarcoma 57 months previously, and undergone adjuvant radiation therapy at the local site. To obtain a definitive diagnosis of the lung tumor, we performed lobectomy of the right lower lobe and lymph node dissection. To avoid possible dissemination, the tumor was resected not using video-assisted thoracic surgery but using thoracotomy. The pathologic diagnosis was pulmonary metastasis of the low-grade endometrial stromal sarcoma. Now, medroxyprogesterone acetate is being administered, and no signs of recurrence have been detected in the 24 months since the lung resection.