Female, 4 years old, with history of JPA, follow-up three month evaluation. Evidence of occipital craniotomy is again seen. A resection cavity centered on the cerebellar vermis has decreased in size from the prior exam. No evidence of surrounding edema or any significant T2 signal abnormality is seen. On postcontrast images, previously seen curvilinear enhancement along the cavity margins has diminished. There remains a small focus of curvilinear enhancement at the anterior margin of the cavity. No additional new intracranial lesions are seen. The fourth ventricle has reexpanded and the ventricular system has resumed normal caliber and morphology. Supratentorial parenchymal morphology and signal are within normal limits.
Expected postoperative findings compatible with resection of tumor from the posterior fossa. The resection cavity has decreased in size along with decreasing nonspecific curvilinear enhancement along the cavity margins. No evidence of any new or recurrent lesion is seen.