Skull erosion and bony changes in a child with endocardial cushion defect.

A 9-year-old boy with an endocardial cushion defect who had skull erosion as well as widening of the diploe is described. This was accompanied by thickening of the tables, "hair-on-end" striations in the skull, and cortical thinning and medullary cavity expansion in the femora. The skull erosion is attributed to venous distension and increased blood volume. The finding of skull erosion in cyanotic congenital heart disease has not been reported before.