CASE 4

Courtesy of Family Smile Polyclinics, Jeddah, Saudi Arabia

8-years-old male with leg pain

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CASE 4 ANSWER

Osteopetrosis

Diffusely increased bone density is noted, leading to loss of corticomedullary differentiation. The metadiaphysis is widened (yellow arrow), there are diaphyseal lucent lines (red arrow), and there is a pathologic fibular fracture (circles)

Key Points

• Genetic disease of imbalanced bone formation and resorption

• Characteristic imaging feature: Increased bone density, loss of corticomedullary differentiation, leucent bone bands, widened metadiaphysis.

• A cause of Erlenmeyer flask deformity, along with storage diseases, chronic anemias, and other bone dysplasias.