Radiology Rounds

Round # 13

• Back to Clinical History and Radiographs
• What is the Differential Diagnosis?
• What is the Correct Diagnosis?

Radiographic Findings

Radiographs of femurs demonstrate expansion of the contour of the femoral shafts with marked cortical thinning (red arrow). The Erlenmeyer flask deformity is noted, with the development of a "convex" surface in the distal femora. Additionally, there is evidence of avascular necrosis (yellow arrow) with sclerosis and radiolucencies in the femoral condyles. These features are also noted on a set of films obtained from a child being treated at the same hospital. The right pediatric hip shows AVN (green arrow) with deformity of the articular surface of the femoral head, and the knee films show the classic Erlenmeyer deformity (red arrow).

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