软组织神经源性肿瘤的MRI诊断.ppt

MRI of soft-tissue neurogenic tumors Wing Chan, MD Department of Radiology Taipei Medical University- Municipal Wan Fang Hospital Imaging characteristic Traumatic neuromas amputation stump Morton neuromas intermetarsal space Neural fibrolipomas fat interspersed between nerve fascicles and often associated with macrodactyly Imaging characteristic Nerve sheath ganglion Cystic appearance and commonly occurs about the knee Neurilemoma, neurofibroma, malignant PNST Fusiform shape, identification of entering and exiting nerve, larget sign, fascicular sign, split-fat sign, and associated muscle atrophy * epineurium nerve fibers perineurium Normal sural nerve T1W T2W Fascicular pattern Traumatic neuroma T1W T1 FS C (+) Morton neuroma Doppler T2W Morton neuroma Elongated, enlarged median nerve fascicles T1W Nerve fascicle Fat Median nerve Neural fibrolipoma T1W T2W Peroneal nerve Gelatinous and myxoid Septum Fibrous wall Nerve sheath ganglion Split-fat sign Fascicular sign Fusiform mass Peroneal nerve neurilemomma T1W T2W *