Ribbing's disease: radiographic-scintigraphic correlation and comparative analysis with Engelmann's disease.

Engelmann's disease is an uncommon condition characterized radiographically by symmetric diaphyseal sclerosis involving predominantly the tubular bones. Ribbing described an entity with similar but less extensive or severe changes which he thought differed sufficiently to constitute a distinct process. We present two cases of Ribbing's disease and one of Engelmann's disease, emphasizing the differences between the two. Radiographic-scintigraphic correlation is provided to demonstrate the value of skeletal scintigraphy in cases of Ribbing's disease and progressive diaphyseal dysplasia.