Two children developed ileo-ileal intussusception a few days after major abdominal surgery. Sonographic study was of primary importance in the evaluation of this lesion which was apparent from clinical and radiographic signs of intestinal obstruction but not from barium enema.

Acromesomelic dwarfism is a rare skeletal disorder characterized by recessive autosomal transmission. A case is described in a boy 2 1/2 years old whose relatives (in a large number) showed a peculiar aspect of the upper extremities, and whose two grandparents were second cousins. Early diagnosis is important because it makes it possible to advise the parents with regard to the infant's prospects and the genetic implication.

A case of brown tumor of hyperparathyroidism in a young girl with a long history of chronic renal failure and hemodialysis therapy is reported. The diagnosis can be reached with the aid of the classic skeletal radiological sign which address the evaluation of both CT and MR imaging.

Two cases of dyssegmental dysplasia, a rare lethal skeletal dysplasia in the newborn, are reported. Two different forms of dyssegmental dysplasia can be distinguished--the lethal Silverman type and the less severe Rolland-Desbuquois type. In this report, both cases are of the Silverman type. Histopathology of chondro-osseous tissue confirms the similarity in pathologic findings to Kniest dysplasia.

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