Hypocalcemic hyper-CK-emia in hypoparathyroidism.

A 15-year-old boy with increased serum creatine kinase (hyper-CK-emia) due to hypocalcemia in turn caused by idiopathic hypoparathyroidism (HP) is presented. Hyper-CK-emia was incidentally noted while managing a patient, aged nine, with mental retardation, epilepsy and mild hypocalcemia. Neurological examination showed normal deep tendon reflexes and no muscle weakness; electromyogram was normal. The hyper-CK-emia normalized during treatment for the hypocalcemia. Previously reported patients with hypocalcemic hyper-CK-emia or myopathy together with HP are discussed, as well as the degree of hypocalcemia and the wide spectrum of the muscle dysfunction.