Friday, May 18, 2012

Epiphyseal Cyst: Differential Diagnosis #16

Bone lesions can be differentiated by several features, including age, number, morphology, and location. For cystic lesions located in the epiphysis, the mnemonic CAGGIE is useful to recall the most common possibilities:

CChondroblastomaRare, can have fluid-fluid level
AAneurysmal bone cystCan also have fluid-fluid level
GGiant cell tumorOnly occurs after physeal closure (age>20), fluid-fluid level
GGeodeaka subchondral cyst (benign)
EEosinophilic granuloma

Metastatic disease should also be considered, depending on the clinical context.

Giant Cell Tumor
Source: Radiopaedia