Hemorrhage from cavernoma of the pons in March A T2 hypointense lesion with susceptibility effect is again seen in the posterior pons and is mildly exophytic into the fourth ventricle. Lesion measures 9 mm in diameter (image 8, series 501) and consistent with pontine cavernous reformation. This is unchanged in size when compared with the prior study dated 3/3/2015, however it has decreased in size when compared with the prior MRI dated 1/24/2015 where it measured 1.4 cm. There is decrease in T1 and T2 signal intensity when compared with the prior study dated 1/24/2015 which is compatible with evolving blood products. There is no surrounding edema. Adjacent developmental venous anomaly is seen within the left cerebellum (image 24, series 2301).Cystic areas are seen adjacent to the lateral ventricle atria most likely represent perivascular spaces and a normal variant. Remainder of the brain parenchyma is unremarkable. No diffusion restriction is seen to suggest acute ischemia. The CSF spaces are appropriate for the patient's stated age with no midline shift. Normal vascular flow voids are present in the major intracranial vasculature.Retention cyst/mucosal polyp is seen in the right sphenoid sinus. The remaining visualized portions of the paranasal sinuses are clear. The visualized portions of the mastoid air cells are clear. The visualized portions of the orbits are intact.
Again seen is a dorsal pontine cavernous reformation with associated developmental venous anomaly. There is mild decrease in size when compared to 1/24/2015 with evolution of internal blood products. Remainder of the brain parenchyma appears unremarkable without evidence of additional cavernous reformations.