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The nail-patella syndrome is an autosomal dominant disorder characterized by deformities of a variety of mesodermal and ectodermal elements. Most affected patients exhibit hypoplasia, dysplasia, or absence of the fingernails and toenails. Other common sites of involvement include the skin, kidneys, pelvis, knees, and elbows. In many cases, the earliest radiographic manifestations of this disorder in infants and children is osteocartilage exostoses (iliac horns) of the iliac wings. These exostoses may be detected with skeletal scintigraphy, and should not be confused with other pathologic conditions

A 30-month-old girl was evaluated with Ga-67 imaging to identify foci of abnormal inflammation. Biopsy of a cutaneous lesion demonstrated manifestations of periarteritis nodosa, which included polymorphic exanthemata-purpuric, urticarial, and multiform in character. There was also severe subcutaneous hemorrhage resulting from necrotizing arteritis. Ga-67 imaging shows the only abnormality located to the posterior neck muscles at sites of cutaneous involvement. Other areas were normal

This 8-year-old girl presented with let flank pain, fever, and inability normally to extend and flex the back. The radionuclide bone scan was abnormal at the site of the epidural abscess. Computed tomography and MRI studies both showed the specific character and extent of the epidural pathology