A 38-year-old woman presents with progressive headaches and visual disturbances for 3 months. Neurological examination reveals bitemporal hemianopsia. MRI brain with contrast shows a well-defined, homogeneously enhancing mass in the sellar region, measuring 2.5 cm, with suprasellar extension compressing the optic chiasm. There is no invasion of the cavernous sinus. What is the most likely diagnosis?
A 52-year-old man presents with progressive right-sided weakness, speech difficulty, and headaches for 2 months. MRI brain shows a large mass in the left frontal lobe, iso-to-hyperintense on T1, iso-to-hyperintense on T2, with heterogeneous enhancement and significant perilesional edema. There is a dural tail sign. What is the most likely diagnosis?
A 7-year-old boy presents with progressive ataxia, morning vomiting, and headaches for 2 months. Fundoscopy shows papilloedema. MRI brain reveals a midline mass in the posterior fossa with mixed signal intensity (T1: isointense to hypointense; T2: hyperintense), with heterogeneous enhancement post-contrast. The mass obstructs the fourth ventricle, causing obstructive hydrocephalus. There is no evidence of leptomeningeal spread on spine imaging. What is the most likely diagnosis?
A 38-year-old woman presents with progressive headaches and blurred vision for 3 months. Neurological examination reveals bitemporal hemianopia. MRI brain with contrast shows a sellar mass with suprasellar extension, T1 hypointense, T2 hyperintense, and homogeneous enhancement. The mass displaces the optic chiasm superiorly. What is the most likely diagnosis?
On diffusion-weighted imaging (DWI), which pattern of restricted diffusion is most specific for epidermoid cyst of the brain?
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