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OCR: CNS, Tubercu osis sarcoidosis invol ngof the producing suprasellar Iniasses thicken infundibu urm optic chiasm These ense with granui lorne tous lesions are usually isoin grey matter on T -weighted MR images. .8.s well asErl hancement the parenchymal lesior ollowing leptomeningeal enhancerment are seen causes of contrast admi inistra tion (Fig 24 .21 Othe ma, infundibular thickening include ynph metastatic carcinoma and Langerhans histiocytosis. imaging Fig. 24.21 Sarcoid losis: 8 agnetic resonan ntrast Coronal TT -weighted image fol llowing ncing administra tion showsa thickened enha tous infundibul urm typical of CNS granul on sures disease Enhancement both sylvian identifies leptomeningeal invol venen lesiors usua isoii iancenment