= rare condition increased bone formation within medullary cavity of long bones of lower extremity similar to progressive diaphyseal dysplasia / hereditary multiple diaphyseal sclerosis

Age: adulthood; F >M

• chronic leg pain that increases with physical activity

Location: uni- / bilateral in ≥1 long bone of lower extremity; most frequently in tibia

Site: middiaphyseal region

• osteosclerosis limited to medullary cavity with minimal / no cortical thickening

Dx: after exclusion of other causes of osteosclerosis (eg, stress fractures, osteomyelitis, metabolic / endocrine disorders, malignancy)