The association between petrous apex cephalocele and XXXX .

@entity1 @entity4776
PURPOSE: Petrous apex cephalocele (PAC) is a rare lesion that has been linked to @entity4776 in several case reports. The aim of this study is to document the incidence of @entity4776 and PAC in consecutive brain MRI studies and study the association between these two lesions to better understand the underlying etiology of PAC. METHODS: A total of 2410 brain MRI studies were performed in our institution in the period from January 2011 to December 2011. After eliminating duplicated studies, a total of 2093 studies met our inclusion criteria. Retrospective analysis of @entity1 ' head MRI was performed by two radiologists independently to identify the presence of @entity4776 and/or PAC. RESULTS: Empty sella was found in 322 (15.4  %) @entity1 . PAC was found in 111 (5.3  %) @entity1 (age range 6-81  years) of which 87 were females and 24 were males. Of all the @entity1 with PAC, 77 (69.4  %) @entity1 had associated @entity4776 . Bilateral PAC was more common and seen in 77 @entity1 . CONCLUSION: PAC is associated with @entity4776 , and both lesions are probably related to the same cause.
