Neonatal non-ketotic hyperglycinemia: a clinical, biochemical and neuropathological study including electronmicroscopic findings.

In a family of four children, three died within 8 days after birth. The fourth child survived after a critical first week with the same symptoms as the siblings. He was at the age of four found to have non-ketotic hyperglycinemia. The histories and neuropathology of the other children were then reexamined. It seems highly probable that all siblings suffered from non-ketotic hyperglycinemia. This report points to the clinical, biochemical and neuropathological diagnostic problems in this disease and also adds new information on the ultrastructural changes, not hitherto visualized.