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Postoperative adhesions. A 39-year-old female patient who had been operated multiple times came with a recurrent posterior fossa arachnoid cyst. Axial T2W image (A) shows a cystic lesion (arrow) in the posterior fossa. It is not clear whether this is a recurrent arachnoid cyst or a postoperative fluid collection. Axial CISS image (B) shows adhesions (arrows) in the cyst, which makes it more likely to be a postoperative fluid collection
