[A cause of intracerebral calcifications that should be known: pseudohypoparathyroidism Ib].

In children, pseudohypoparathyroidism (PHP) is a rare but classical cause of basal ganglia calcifications. It is caused by resistance to parathormone (PTH). Hypocalcemia, which may be symptomatic, is its main feature. We report the case of a 13-year-old boy, affected by type Ib PHP revealed by hypocalcemia and seizures, with basal ganglia calcifications on the CT scan. We describe the characteristics of the 2 main types of PHP and emphasize the search for this disease when basal ganglia calcifications are discovered, even fortuitously, on a cerebral CT scan.