Tender subcutaneous nodule right postauricular scalp. There is a well-defined enhancing nodular lesion in the right post-auricular scalp that measures 5 x 15 mm in cross-section. The underlying mastoid bone appears to be intact. There is no evidence of intracranial hemorrhage, mass, or acute infarct. There are mild scattered foci of nonspecific cerebral white matter T2 hyperintensity. 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 are grossly unremarkable.
A well-defined lesion in the right post-auricular scalp that measures up to 15 mm may represent a peripheral nerve sheath tumor or "traumatic neuroma", for example.