Headache [R51], Reason for Study: ^Reason: seizure History: complex partial seizure. No evidence of acute ischemic or hemorrhagic lesion on the scan. There is no evidence of abnormal enhancement either.The ventricles, sulci and cisterns are symmetric and unremarkable. The gray-white matter differentiation is normal. There is no mass, mass effect, edema, midline shift, intra or extra-axial fluid collection/hemorrhage, restricted diffusion/acute ischemia, or abnormal contrast enhancement. The midline structures and cranial-cervical junction are normal. Normal flow voids are identified in the major intracranial vessels. The paranasal sinuses and mastoid air cells are clear.There is a however, well circumscribed lobulated right high convexity scalp lesion [13.3mm (RL) x 21mm(AP) x 12.1mm (CC)] which shows low on T1, mixed high on T2 without showing evidence of enhancement. The lesion also shows evidence of restricted diffusion especially center portion. Constellation of these findings suggest benign subcutaneous lesion such as sebaceous cyst.
Normal brain MRI.Sebaceous cyst on the right high convexity.