Preterm Infant with Generalized Arterial Calcification of Infancy Who Survived Due to Early Diagnosis and Appropriate Treatment with Bisphosphonates: A Case Report.

Generalized arterial calcification of infancy (GACI) is a rare disease characterized by arterial calcification. GACI is caused by a mutation in the ENPP1 or ABCC6 genes. GACI causes severe hypertension and heart failure, and approximately 50% of patients die within the first 6 months. In particular, preterm infants with GACI often die due to immature cardiac function. Bisphosphonates are effective in treating GACI; however, no standardized treatment regimen is available. We experienced a case of a preterm infant with GACI born at 30 weeks gestation. Ultrasonography showed high-intensity lesions in the arteries, and computed tomography revealed calcification of the arteries throughout the body, leading to the diagnosis of GACI. We administered intravenous pamidronate, and her cardiac contraction improved. The initial scheduled interval between drug administrations was 2 months. However, the cardiac contraction worsened 1 month after the pamidronate administration. Therefore, we decreased the dosing interval and administered a second course of pamidronate, which improved her cardiac function. We then switched to oral etidronate. To improve the morbidity and mortality rates of preterm infants with GACI, it is important to obtain an early diagnosis of GACI by investigating high-intensity lesions in the arteries and performing early administration of an appropriate type of bisphosphonate.