XXXX : posttreatment changes of imaging findings.

@entity1 @entity3329 @entity82 @entity5 @entity189 @entity194 @entity2171
OBJECTIVE: The purpose of this study was to determine the radiologic results of @entity189 ( @entity189 ) that showed complete responses on follow-up imaging studies after radiation therapy. MATERIALS AND METHODS: This study is a retrospective review of 23 @entity1 (18 male, 5 female, aged 15-71 years; mean age, 48.5 years) affected with @entity189 , from August 1995 to July 2000, who were examined with magnetic resonance imaging or computed tomography scan before and after either radical radiotherapy or chemoradiotherapy. The median follow-up was 24.7 months and ranged from 12 to 48 months. We analyzed the @entity5 by ascertaining/measuring @entity5 size, depth, @entity2171 , skull base invasion, and @entity3329 . The treatment responses for @entity5 were classified as either @entity194 , scar (asymmetric elevation without enhancement), or normalized. The @entity5 response and the appearance of bone regeneration in the previous destructive part of the skull base were also recorded. RESULTS: The 23 @entity1 consisted of 12 superficial @entity5 , for whom treatment results were normalized in 10, @entity194 in 1, and scar in 1 and 11 deep @entity5 for whom treatment results were scar in 6, normalized in 3, and @entity194 in 2. Skull base invasion was detected in 6 @entity1 , 5 of whom showed complete healing of skull base destruction after radiotherapy. However, the other @entity1 exhibited an unusual hyperostotic change in the skull base mimicking @entity82 of the skull base. CONCLUSIONS: The superficial @entity5 tended to be radiologically normalized even when they were large. However, the deep @entity5 mainly changed to scar after radiation therapy. On the other hand, skull base invasion could be normalized after radiotherapy.
