Right femoral aneurysmal bone cyst
Right upper thigh pain.
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Right femoral shaft upper diaphyseal sharply defined, expansile osteolytic lesion, with thin peripheral margins showing multilocular appearance eliciting isointense signal on T1, alternating isointense to high signals on T2 & STIR WIs, with fluid-fluid levels. It measures 2.1 x 6.5 cm along its maximal axial & craniocaudal dimensions. No MR evidence of cortical disruption or associated soft tissue components.
Right upper femoral shaft expansile osteolytic lesion showing fluid/fluid levels with no associated soft tissue component representing an aneurysmal bone cyst.