 There is a relatively thick-walled, cystic lesion in the inferior aspect of left frontal horn without appreciable enhancement, appearing similar to the prior study. There is no associated mass effect or evidence of hydrocephalus. The ventricles and sulci are normal in size. The remainder of the brain is unremarkable without abnormal enhancement. No diffusion-weighted abnormalities are identified. There are no extra-axial fluid collections. The paranasal sinuses and mastoid air cells are clear.
Thick-walled, cystic lesion in the left frontal horn, appearing similar to the prior study. Differentials include a chronic lesion related to prior infection such as neurocysticercosis. Given the relatively thick wall of the lesion, this would not be compatible with a simple neuroepithelial cyst. A low-grade neoplasm cannot be entirely excluded, such as a subependymoma, and recommend continued follow-up.