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Left middle cranial fossa arachnoid cyst (MRI)

A type 1 left middle cranial fossa arachnoid cyst is shown on MRI following signal characteristics consistent with cerebrospinal fluid imaging sequences; T1- (A), FLAIR (B), diffusion- (C) and T2- (D) weighted sequences. Minimal mass effect is seen on the adjacent temporal lobe. (Contributed by Dr. Diana Gomez-Hassan, University of Michigan.)