PT  - JOURNAL ARTICLE
AU  - S.A. Nabavizadeh
AU  - L.T. Bilaniuk
AU  - T. Feygin
AU  - K.V. Shekdar
AU  - R.A. Zimmerman
AU  - A. Vossough
TI  - CT and MRI of Pediatric Skull Lesions with Fluid-Fluid Levels
AID  - 10.3174/ajnr.A3712
DP  - 2014 Mar 01
TA  - American Journal of Neuroradiology
PG  - 604--608
VI  - 35
IP  - 3
4099  - http://www.ajnr.org/content/35/3/604.short
4100  - http://www.ajnr.org/content/35/3/604.full
SO  - Am. J. Neuroradiol.2014 Mar 01; 35
AB  - SUMMARY: Fluid-fluid levels can occur whenever different fluid densities are contained within a cystic or compartmentalized lesion, usually related to the evolution of hematoma or necrosis. Review of the literature demonstrated that throughout the skeletal system, the most common etiology for fluid-fluid levels is aneurysmal bone cyst, but there are no dedicated studies of the pediatric calvaria, to our knowledge. In this report, we present clinicopathologic characteristics and CT and MR imaging of 11 patients with pediatric skull mass lesions demonstrating fluid-fluid levels. MR imaging demonstrated more fluid-fluid levels compared with CT in all cases. The etiologies of skull lesions with fluid-fluid levels were Langerhans cell histiocytosis in 4 (36.6%), aneurysmal bone cysts in 3 (27.2%), cephalohematoma in 3 (27.2%), and metastatic neuroblastoma in 1 (9%). Radiologists should be aware of the other etiologies of calvarial lesions with fluid-fluid levels in the pediatric skull. ABCaneurysmal bone cystFFLfluid-fluid levelLCHLangerhans cell histiocytosis