Alzafer, SuhaOkur, ErdalHalezeroğlu, Semih2023-02-142023-02-142015-10-011309-470X1309-5994https://hdl.handle.net/11443/435ABSTRACT Most of the mediastinal cysts are benign but still needs surgical excision for a definitive diagnosis and to prevent compressive symptoms. Radiological examination itself may sometimes have limited diagnostic value. A pericardial cyst is always a benign lesion and does not need an excision unless it reaches to an extreme size while a thymic cyst should be excised when diagnosed since it may rarely show malignant degeneration. Here we present an extreme sized thymic cyst radiologically mimicking a pericardial cyst.enArticle