SBC: well-defined osteolytic lesion without expansion of the proximal meta-diaphysis of the humerus with pathologic fracture

Solitary Bone Cyst
-Solitary bone cyst, also known as unicameral bone cyst, is a true cyst.
- Many well-defined osteolytic lesions are often called cystic, but this is a misnomer.
-SBC frequently presents with a fracture. Sometimes a fallen fragment is appreciated. Predilection sites: proximal humerus and femur.
-Usually less expansion compared with ABC.
-Differential diagnosis: ABC, FD when cystic. SBC may migrate from metaphysis to diaphysis during growth of the bone.
-Discriminators:
Must be under age 30.
Must be centric


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