 There are postsurgical findings consistent with midline suboccipital craniotomy relating to resection of pontine cavernous malformation. Susceptibility related to hemosiderin deposition is demonstrated in the posterior pons with small foci of nonspecific T1 and T2 signal. The exophytic portion of the pontine lesion has been resected. The lesion now measures 8 x 6 mm, previously 12 x 15 mm. A prominent adjacent DVA in the left cerebellum is again demonstrated. The ventricles and sulci are within normal limits. Slightly prominent perivascular spaces are incidentally noted along the ventricular atria within the periventricular white matter. The cisterns remain patent. There is no midline shift or mass effect. There are no additional areas of abnormal signal or pathological enhancement. There is no diffusion abnormality. No extra-axial fluid collection is identified.Normal flow-voids are demonstrated in the major intracranial vascular structures. The midline structures and craniocervical junction are within normal limits.
There are interval postoperative findings related to resection of dorsal pontine cavernous malformation with a residual rounded dorsal pontine signal abnormality suspected to represent a small residual component of the lesion. The exophytic component has been entirely resected. A prominent left cerebellar DVA is again demonstrated.