Korean J Pediatr.
2005 Jun;48(6):665-668.
A Case of Vitamin D-Dependent Rickets, Type 1
- Affiliations
-
- 1Department of Pediatrics, College of Medicine, Inje University, Goyang, Korea. chonglee@ilsanpaik.ac.kr
- 2Department of Diagnostic Radiology, College of Medicine, Inje University, Goyang, Korea.
Abstract
- "Rickets" is the term applied to impaired mineralization at epiphyseal growth plate, resulting in deformity and impaired linear growth of long bones. Rickets may arise as a result of vitamin D deficiency or abnormality in metabolism. Vitamin D-dependent rickets (VDDR) is rare autosomal recessive disorder in which affected individuals have clinical features of vitamin D deficiency. In 1961, Prader first described this disorder including severe clinical features of rickets, such as hypophosphatemia, hypocalcemia, muscle weakness and seizure. Two distinctive hereditary defects, type I VDDR and type II VDDR have been recognized in vitamin D metabolism. Type I VDDR may be due to congenital defects of renal 1 alpha-hydroxylase, the enzyme responsible for conversion of 25 (OH) D3. These patients have low to detectable 1,25(OH)2D3 in presence of normal to raised 25 (OH) D3. In type II VDDR, renal production of 1,25(OH)2D3 is intact but 1,25(OH)2D3 is not used effectively and target organ resistant to 1,25(OH)2D3 is respectively derived from the abnormality in the vitamin D receptor. We report a case of a 25 month-old girl with typical clinical features of VDDR type I rickets, hypocalcemia, increased alkaline phosphatase and secondary hyperparathyroidism.
MeSH Terms
-
Alkaline Phosphatase
Child, Preschool
Congenital Abnormalities
Female
Growth Plate
Humans
Hyperparathyroidism, Secondary
Hypocalcemia
Hypophosphatemia
Metabolism
Muscle Weakness
Receptors, Calcitriol
Rickets*
Seizures
Vitamin D
Vitamin D Deficiency
Vitamins*
Alkaline Phosphatase
Receptors, Calcitriol
Vitamin D
Vitamins
