Diffuse idiopathic skeletal hyperostosis with prominent appendicular bone proliferation in a dog

This report described radiographic and CT features of atypical diffuse idiopathicskeletal hyperostosis in a 5 year-old, female Shih-tzu showing marked proliferative bonelesions in the appendicular skeleton with minor spinal changes. Continuous or flowing bonybridge formation of vertebrae is used as the gold standard for diagnosing diffuseidiopathic skeletal hyperostosis. However, this criterion seems not to be suitable forappendicular type diffuse idiopathic skeletal hyperostosis, as in the present case.Diffuse idiopathic skeletal hyperostosis is a progressive skeletal disease, and thus,enthesophytosis and the multiple bony proliferations at insertion sites of ligaments andtendons to appendicular bones in a lamellar or trabecular pattern were considereddiagnostic features of the appendicular type of diffuse idiopathic skeletalhyperostosis.