Primary hypomagnesemia caused by isolated magnesium malabsorption: Atypical case in adult

Isolated magnesium malabsorption is a rare disorder, which bas been describ ed in no more than 30 patients worldwide. Patients with this disorder typic ally present with convulsion and diarrhea in early infancy. Hypomagnesemia and hypocalcemia were found in a 35-year-old man with muscle cramps, who ba d been diagnosed as primary hypoparathyroidism. Oral magnesium therapy corr ected the low serum calcium, magnesium and parathyroid hormone levels. We r eport an atypical case of isolated magnesium malabsorption in an adult.