Fig. 10
From: Role of diffusion weighted MR-imaging in the evaluation of malignant mediastinal lesions
Grade I immature (malignant) teratoma (pathologically proven after thoracotomy and complete excision—excised lymph nodes: free): A 13-year-old male with an anterior mediastinal (prevascular) mass identified on CT. The patient clinically presented with mild chest pain (discomfort). b Axial T1 WI, c axial T2 WI, and d axial STIR WI show a well-defined rather wedge-shaped anterior mediastinal mass displaying overall heterogeneous signal on all pulse sequences by virtue of its fat and calcific components (confirmed by referring to a axial MDCT of the chest in mediastinal window). Associated findings: Lingular collapse and small prevascular and left hilar lymph nodes, largest measures 1.5 cm. Lesion’s soft tissue component shows facilitated diffusion. It displays bright signal on e DWI seen corresponding to bright signal on the f ADC map: ADCmean = 2.44 × 10−3 mm2/s and ADCmin = 1.701 × 10−3 mm2/s