Shepherd’s Crook Appearance

Imaging A prominent, rarely observed deformity-coxa vara with outward bowing of the proximal femoral shaft, likened to the hooked staff used by the shepherds of yore, described in polyostotic fibrous dysplasia. It is also seen—but less prominent—in chondrosarcoma, Paget’s disease of bone, McCune-Albright syndrome, osteogenesis imperfecta
Findings Marked softening of femoral neck, cortical thickening, accentuated trabeculation and unilateral shortening of the leg
Parasitology A descriptive term for the morphology of the posterior end of microfilariae of Mansonella (formerly, Dipetalonema) streptocerca