Fig. 6

Axial a T2 FLAIR and b T1 contrast sections of brain showing near complete resolution of the primary lesion. c–f There is interval development of heterogeneously enhancing mass lesion (2.4 × 2.0 × 1.4 cm) in the inferior part of fourth ventricle causing marked compression on dorsal medulla. Another heterogeneously enhancing nodular lesion (1.1 × 0.6 × 1.4 cm) seen in right posterior subarachnoid space at the level of C2 vertebra causing mild compression of the posterior cervical spinal cord. Abnormal leptomeningeal enhancement is seen along the surface of brainstem and cerebellum. g, h Abnormal leptomeningeal enhancement is also seen along the surface of entire spinal cord with thickening and clumping of the cauda equina nerve roots