Extradural plasmacytoma

This study is from a patient with known multiple myeloma. The MRI of the thoracic spine in the midsagittal plane reveals an extradural mass in the midthoracic spine. On the T2-weighted images (A and B) the spindle-shaped mass is overlaid in green (B). The mass interrupts the posterior CSF column (arrow). The gadolinium-enhanced T1-weighted images (C and D) reveal a more prominent area of involvement due to the associated hyperemia in the region (salmon overlay in D).