Pulmonary sclerosing pneumocytoma with mediastinal lymph node metastasis: a case report.

Pulmonary sclerosing pneumocytoma (PSP) is a rare tumor and the imaging appearance is usually a well-circumscribed nodule. Herein we present the clinicopathological features of a 25-year-old female patient with a 4 cm mass in the left upper lobe. She had undergone lobectomy with lymph node dissection with an incorrect intraoperative frozen section diagnosis of adenocarcinoma and diagnosed as a PSP with lymph node metastasis on permanent sections. The 3-year follow-up of the patient is uneventful.