31 years, Male, with Dandy-Walker variant, hydrocephalus, pituitary tumor, and headaches. Question any change in the pituitary tumor or the ventricles.. The bilateral lateral ventricles and third ventricles are collapsed and not appreciably changed since CT dated 1/27/2016. Left parietal VP shunt catheter is in place with unchanged position of the ventriculostomy catheter with its tip near the foramen of Monro. There is unchanged FLAIR hyperintensity in the left periatrial region compatible with gliosis, probably related to the ventriculostomy catheter. Linear FLAIR hyperintensity involving the left frontal periventricular white matter is also likely related to prior ventriculostomy tract. Focal thinning involving the anterior callosal body with susceptibility/chronic blood products also remains unchanged and corresponds to tract of ventriculostomy catheter seen on 3/22/2009.No evidence of acute ischemia or hemorrhage. No extra-axial collections. There is diffuse thickening of the calvarium which may be related to chronic shunting. Unchanged posterior fossa findings including a retrocerebellar arachnoid cyst which is associated with superior bowing of the tentorium, anterior displacement of the cerebellum, and mild scalloping of the occipital bone. This finding remains unchanged dating back to 7/22/2009.Dedicated images of the pituitary gland demonstrate unchanged appearance of the pituitary gland without definite evidence of pituitary micro or macroadenoma. There is slight heterogeneity of the posterior aspect of the pituitary gland with subcentimeter focus of T2 hyperintensity and enhancement which may represent a pars intermedia cyst and unchanged. Normal T1 shortening involving the neurohypophysis is not clearly seen which is nonspecific. Bilateral cavernous sinuses are unremarkable. Infundibulum is unremarkable. Optic chiasm and nerves are unremarkable.
1. Shunted ventricular system remains decompressed and unchanged since CT head dated 1/27/2016.2. Posterior fossa findings including a retrocerebellar arachnoid cyst with local mass effect remains unchanged dating back to 7/22/2009.3. Unchanged appearance of the pituitary gland without definite evidence of micro- or macroadenoma. Tiny nonenhancing area in the posterior pituitary gland remains unchanged and may represent a pars intermedia cyst. No associated mass effect. 