Nodule overflying fontanelle, suspected dermoid cyst. There is a well-defined T1 hypointense and T2 hyperintense lesion in the midline of the apical scalp region that measures 20 AP x 15 RL x 7 SI mm. The lesion exhibits restricted diffusion. There is no evidence of underlying calvarial defects or intracranial extension. There is no evidence of intracranial hemorrhage, mass, or acute infarct. The brain parenchyma and pituitary gland appear unremarkable. 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 lesion in the midline apical scalp may represent an inclusion cyst, but is incompletely characterized. A Doppler ultrasound may be useful for further evaluation, if clinically warranted. 