 This exam is extremely limited as the patient canceled the exam prior to completion. No dedicated internal auditory canal or postcontrast sequences are available. There are postoperative findings related to left occipital craniotomy for presumed resection of a CP angle or internal auditory canal mass. There is a 22 x 9 mm rounded and loculated focus of low signal intensity on T1 and T2-weighted imaging within the left cerebellopontine angle. In addition, there is a 3 x 4 mm low intensity structure along the anterior wall of the left internal auditory canal which has a deformed postoperative appearance. There is volume loss along the lateral aspect of left cerebellar hemisphere and T2 hyperintensity compatible with gliosis - findings suggesting a chronic AICA infarct. Within the limitations as discussed above as well as lack of comparison exams, no definitive statement can the made regarding the presence or absence of tumor in this location. There is no evidence of acute infarct. The ventricles and basal cisterns are normal in size and configuration. There is no midline shift or herniation. The major cerebral flow voids are intact. There are bilateral maxillary sinus retention cyst, left greater than right.
1.Within the marked limitations as discussed above and the lack of comparison exams, no definitive statement can be made regarding the presence or absence of tumor in the left cerebellopontine angle/internal auditory canal. Tissue in this region may represent residual tumor or granulation tissue / blood products. A repeat contrast-enhanced exam of the internal auditory canals is suggested.2.Findings compatible with chronic left cerebellar AICA distribution infarct.