Summary. The diagnostic value of computed tomography was verified in the study of mucoceles in the paranasal sinuses involving the orbit. The CT data on 43 patients with clinical suspicion of mucocele highlight the characteristic signs; 26 were found to have a mucocele at operation.

The result of a late CT control of infantile hydrocephalus is reported with an analysis of effects of the catheter on the cerebral tissue in the immediate and late postoperative course. The most frequent finding is blood in the ventricle and/or subependymal or intraparenchymal along the catheter or near its tip.

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