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Rostral regions of pilocytic astrocytoma (MRI)

Unenhanced MRI depicting the more rostral cystic regions of the tumor. Left: T2-weighted image (TR 2900/TE 31) demonstrating the well-circumscribed cyst, filled with fluid that is slightly hyperintense compared to cerebrospinal fluid. Note the lack of surrounding edema. Right: T1-weighted image (TR 14.3/TE 3.1) demonstrating the cyst. The cyst fluid has similar intensity to cerebrospinal fluid. (Contributed by Dr. Herbert Newton.)