Male, 26 years old, status post suboccipital craniotomy for CP angle tumor resection, surveillance imaging. Redemonstrated is evidence of a right suboccipital and transmastoid craniotomy. The fatty packing material placed within the surgical defect has diminished in volume.The residual right CP angle tumor continues to decrease in size now measuring approximately 3 x 2 cm, previously 3.5 x 2.5 cm. Enhancement extending into the skeletonized right IAC is less distinct than on the prior examination. Mass effect on the brainstem with leftward deviation of the pontomedullary junction and slight fourth ventricular effacement are somewhat improved. As on the prior examination, the mass produces leftward deviation of the vertebrobasilar system. The right cisternal cranial nerves V and VI are not discretely visualized and may be encased or displaced by the mass.No additional areas of signal abnormality or pathologic enhancement are seen. The cerebral hemispheres demonstrate normal morphology and signal characteristics. No evidence of acute intracranial hemorrhage is seen. The ventricles are otherwise normal in size and morphology.
Continued interval decrease in size of the residual right CP angle mass.