Hypocalcaemia is a serious disorder, which can be manifested by severe neuropsychic disturbances. We present case reports of four boys with hypocalcaemia, neurologic symptoms and psychomotor retardation. In three boys we found pseudohypoparathyroidism and in one patient hypoparathyroidism. Remarkable improvement was observed after calcium and vitamin D supplementation.

        Key words: hypocalcaemia, parathyroid hormone