Pyle disease (Monarch Disease Ontology id MONDO_0009943) is a bone dysplasia characterized by genu valgum, metaphyseal anomalies with broadening of the long bones extending into the diaphyses and giving the femora and tibiae an 'Erlenmeyer flask'' appearance, widening of the ribs and clavicles, platyspondyly and cortical thinning. Also known as: Bakwin-Krida syndrome, Pyle's disease, Pyle's syndrome, Pyle-Cohn syndrome, chondrodysplasia calcificans metaphysealis, metaphyseal dysplasia, Pyle type.