ANEURYSMAL BONE CYST- DIAGNOSED BY CT SCAN AND CT GUIDED TRUCUT BIOPSY

Clinical history: 20 year old male presented with midly painful expansile swelling around the left knee. Imaging findings:
    • Well defined, expansile lytic lesion noted along the medial aspect of the metadiaphyseal region of the distal left femur (yellow arrow) with mild adjacent periosteal reaction (blue arrows).
    • The distal femoral cortex is significantly expanded and thinned out with multiple cortical breaks. No significant associated soft tissue component noted. No matrix calcifications (star).