A 50-year-old female patient applied to our clinic in March 2017 after a nodular lesion in her right lung was detected in another hospital. The patient had no complaints, no smoking or tuberculosis history. There was no significant trait in her clinical history. She was not using any medication. Vital findings were followed, as blood pressure arterial 120/70, pulse rate 90/min, respiratory rate 14/min and Oxygen saturation in room air 97%. Her respiratory system examination was normal. WBC 8200, hmg 14.1, Plt 400000, urea 24, creatinine was 0.6. Contrast-enhanced Thorax CT showed a well-defined, hypodense soft-tissue lesion in the size of 28 x 16 mm closely located to the right inferior pulmonary vein (Fig. 1). In PET-CT, a mass of soft tissue with a lobulated contour with no evidence of increased FDG uptake was detected in the superior segment of the right lower lobe of the lungs in the medial paramediastinal area in sizes of 31 x 22 mm. A transthoracic biopsy was planned under the guidance of tomography but the patient refused. Endobronchial pathology was not detected by fiber opticbronchoscopy. The patient was then referred to thoracic surgery who proceeded to a right lateral thoracotomy. Frozen sample was sent during right lateral thoracotomy. Immunohistochemistry analysis of the resected lesion showed positive (+) with TTF-1, bcl-2 and pansitokeratin, weakly (+) with Napsin-A and CD99 and negative with CD34 (Fig. 2, Fig. 3) consistent with sclerosing pneumocytoma. Sclerosing pneumocytoma was detected after incisional biopsy of the lower lobe of the right lung. Postoperative complications did not develop and the patient was followed-up.