5-year-old male patient with seizures. Evaluate temporal lesion on right. There is a 5.8 x 2.5 x 6.4 cm extra-axial lesion along the right frontal convexity which follows cerebrospinal fluid signal characteristics on all sequences and does not enhance on post-contrast imaging. This lesion is associated with remodeling of the overlying calvarium and causes mass effect on the underlying right frontal lobe and right superior temporal gyrus, but there is no underlying vasogenic edema or gross dysplasia within the brain. 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, paranasal sinuses, and scalp soft tissues are grossly unremarkable.
A large extra-axial lesion along the right frontal convexity with mass effect upon the underlying brain parenchyma and remodeling of the overlying calvarium most consistent with an arachnoid cyst.I personally reviewed the Images and/or procedure with the Resident/Fellow and agree with this report.