{Reference Type}: Case Reports {Title}: Placental Transmogrification of the Lung Presenting as Cystic-Solid Mass: A Case Report. {Author}: Liu C;Zhang Y;Li D;Sun D; {Journal}: Clin Respir J {Volume}: 18 {Issue}: 7 {Year}: 2024 Jul {Factor}: 1.761 {DOI}: 10.1111/crj.13807 {Abstract}: The gradually progressive solitary cystic-solid mass of chest CT scans is highly suggestive of lung cancer. We report a case of a 29-year-old woman with a persistent cystic-solid lesion in the right upper lobe. A chest CT scan showed a 35 mm × 44 mm × 51 mm focal cystic-solid mass in the anterior segment of the right upper lobe. The size of lesion had increased over 3 years, especially for the solid component. The right upper lobe pneumonectomy was performed. Postoperative pathological examination showed placental transmogrification of the lung, which is a rare cause of pulmonary cystic lesion.