1. A case of vertebra plana (Calvé) is described and serial radiographs throughout the course of the disease are presented.

2. The initial radiographs showed a vertebra of normal depth which collapsed to a thin disc in fifteen days. Since the symptoms had begun twelve days before the first examination the total time taken to reach this stage was twenty-seven days.

3. The literature has been reviewed for evidence of the underlying pathology of vertebra plana. In the case described biopsy of the affected vertebral body was not carried out, and thus the nature of the underlying change could not be determined.

1 . A case of parosteal osteoma with histologically low-grade sarcomatous areas is described.

2. Arteriography revealed abnormal arteries, the histological appearances of which are described.

3. Vascular shunts indicative of low-grade malignancy were also seen.

4. Reasons are given for accepting the view that this lesion is a tumour, originally benign, but liable to the development of low-grade malignancy.

1. Three cases of metaphysial fractures in infants are described. Obstetrical trauma was probably responsible in two cases, and in the third case direct injury was admitted by the parents.

2. These fractures are associated with bone destruction and periosteal new bone formation in the metaphyses. They are important because they can be confused with syphilis, tuberculosis, scurvy, osteomyelitis and neoplasm.

3. The fractures respond to conservative treatment and usually heal rapidly in a matter of weeks.