Reason: evaluate for residual cyst History: hx of epidermoid cyst resection. Postoperative changes of epidermoid resection including a left suboccipital craniotomy. Asymmetric prominence of the left ventral medulla without diffusion restriction or enhancement appears similar to the prior exam. Evaluation of this region is limited on 3-D T1 sequences due to artifact.The brain parenchyma appears otherwise unremarkable. There is no abnormal intracranial enhancement. 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. The orbits, skull, paranasal sinuses, and scalp soft tissues are grossly unremarkable. There has been interval resolution of mucosal thickening in ethmoid and maxillary sinuses. Prominent adenoids are decreased in size compared to the prior exam.
1.Postoperative changes of epidermoid resection without definite evidence of recurrence.2.Asymmetric prominence of the left ventral medulla is stable and likely postoperative.