MRI features of a primary thoracic epidural melanoma: a case report.

We present the magnetic resonance imaging (MRI) findings on a patient with a primary thoracic extradural spinal malignant melanoma. MRI showed a well-defined T1-hyperintense mass that was mostly of low signal on T2-weighted images. Surgery confirmed the presence of a well-encapsulated black-colored lesion which proved to be a melanoma. Extensive searches revealed no other foci of melanoma and no other lesions have appeared during a 6-month follow-up; thus, the diagnosis of primary melanoma was established. Extradural primary melanomas are exceedingly rare. We discuss their differential diagnosis and their probable etiology.