Female, 43 years old, with history of a left cerebellopontine angle meningioma status post resection, surveillance imaging. Again seen are postsurgical changes of left retrosigmoid craniotomy for resection of a left cerebellopontine angle meningioma. Compared to multiple prior studies there appears to be mild gradual enlargement of the residual extra-axial enhancing tissue in the left prepontine cistern. For example enhancing tissue measures 8 x 20 mm, post gadolinium 3-D series 12 image 53, compared to 6 x 18 mm measured in a similar plane on study from 9/30/2015. Craniocaudally lesion measures approximately 18 mm, previously approximately 15 mm on 9/30/2015.There is focal mass effect upon the left aspect of the pons which is minimally worse. Mass is noted to contact the left trigeminal nerve in its cisternal segment which has slightly progressed since priors. There is minimal contact of the basilar artery which remains patent. Remainder of the brain parenchyma is unremarkable. Incidentally seen is linear enhancement within the central pons compatible with capillary telangiectasia. No evidence of ischemia or hemorrhage. Ventricles are normal in size. Small left paraclinoid internal carotid artery aneurysm is better appreciated on prior CTA.
Postoperative findings related to prior left cerebellopontine angle meningioma resection. Residual meningioma centered in the left prepontine cistern demonstrates gradual enlargement across multiple prior studies.