Peritumoral cysts associated with XXXX .

@entity808 @entity1 @entity1313 @entity5 @entity2967 @entity4611 @entity4236 @entity1653 @entity45 @entity976
UNASSIGNED: OBJECT Peritumoral cysts are benign nonneoplastic cysts that are found adjacent to extraaxial @entity1313 such as @entity1653 , @entity808 , @entity976 , and @entity4236 . Peritumoral cysts associated with @entity4611 have not been previously described in the literature. The authors report 6 cases of giant macroadenoma-associated peritumoral cysts and delineate their imaging spectrum. METHODS The authors retrospectively reviewed the records of 179 @entity1 diagnosed with @entity4611 who underwent @entity5 resection at their institution and had preoperative MRI scans available for review. The @entity1 were evaluated for the presence of associated peritumoral cysts. Clinical presentation, histopathology, follow-up time, @entity5 and peritumoral cyst dimensions were recorded. Signal intensity on T1-weighted, T2-weighted, diffusion-weighted, and FLAIR sequences, as well as pre- and postcontrast appearance, were determined. RESULTS Six @entity1 (3.4%) with associated peritumoral cysts were identified in our cohort of 179 @entity1 with @entity4611 . Twelve @entity1 in the cohort had @entity2967 (>=  4.0 cm), and 50% of these @entity5 had associated peritumoral cysts with significant extrasellar extension of the macroadenoma. @entity5 with craniocaudal, transverse, and anteroposterior diameters of 3.6 * 3.4 * 4.2 cm to 7.0 * 7.4 * 6.8 cm (mean 5.3 * 5.1 * 5.6 cm), respectively, had associated peritumoral cysts. The growth pattern in all @entity5 was suprasellar, with predominant anterior and lateral extension. Cysts showed T1-weighted, T2-weighted, and FLAIR hyperintensity in 67%, 67%, and 60% of @entity1 , respectively. There was no contrast enhancement of the cyst wall or fluid contents in any @entity1 . Postoperatively, cysts had completely resolved (4 of 5) or significantly decreased in size (1 of 5). One @entity1 was lost to follow-up. CONCLUSIONS @entity45 are rare, benign, and likely nonneoplastic fluid collections that do not represent @entity5 . These cysts display a predictable pattern of hyperintensity on T1-weighted, T2-weighted, and FLAIR sequences and do not enhance. They most likely represent proteinaceous CSF in a sulcus or cistern that becomes trapped (encysted) by anterolateral extension of unusually large macroadenomas. Peritumoral cysts may facilitate resection of the associated macroadenoma by providing a cleavage plane.
