Miranda, AMarques, JFerreira, JCunha, FRibeiro, MRuivo, R2018-11-192018-11-192018Arch Pediatr. 2018 Nov;25(8):489-4921769-664Xhttp://hdl.handle.net/10400.10/2051A thymolipoma is a slow-growing, anterior mediastinal tumor, rare in childhood. The authors present a report of a 4-year-old girl with persistent right thoracic hypotransparency on the chest radiograph. Computed tomography and magnetic resonance imaging revealed an anterior, well-limited, mediastinal mass of heterogeneous density, with lipomatous and soft tissue density areas. The tumor was totally excised and the histopathologic findings revealed a thymolipoma. A year and a half after surgery, the child remains well. This report enhances the relevance of differential diagnosis in the presence of persistent radiologic thoracic hypotransparency.engMediastinal neoplasmsThymus neoplasmsChildjournal article10.1016/j.arcped.2018.09.010