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Radiological "metamorphosis" in a patient with severe congenital osteogenesis imperfecta
F Pendola1, C Borrone, M Filocamo
1Department of Paediatrics II, Istituto G. Gaslini, Genova Quarto, Italy.
Insights
This study details a rare case of congenital osteogenesis imperfecta (OI) with a unique bone structure transformation. The findings highlight the need for careful interpretation of neonatal OI radiographs for accurate prognosis.
Area of Science:
- Genetics
- Biochemistry
- Pediatrics
Background:
- Osteogenesis imperfecta (OI) is a group of genetic disorders characterized by bone fragility.
- Congenital OI presents at birth with severe skeletal deformities.
- Accurate diagnosis and prognosis are crucial for patient management.
Observation:
- A fetus diagnosed with congenital osteogenesis imperfecta (OI) via ultrasound at 31 weeks gestation.
- The infant, diagnosed with OI type IIB/III at birth, showed a transition to an OI type IIA (thick bone) appearance by 12 weeks.
- Fibroblast analysis revealed a heterozygous dominant mutation in type I collagen synthesis.
Findings:
- The study documents a rare case of congenital osteogenesis imperfecta (OI).
- A significant radiological change from "thin bone" to "thick bone" type OI was observed within 12 weeks of birth.
- A structural defect in alpha 1 (I) collagen was identified, indicating a dominant mutation.
Implications:
- The dynamic radiological changes in OI challenge current classification systems.
- Fractures and callus formation may not solely explain the observed bone structure alterations.
- Radiographic interpretation in neonatal OI requires caution for prognostic and genetic counseling.
Abstract:
Congenital osteogenesis imperfecta (OI) was diagnosed by ultrasound in a 31-week-old fetus, and the diagnosis confirmed after delivery by caesarean section at week 36. The baby survived the neonatal period, but failed to thrive, had recurrent respiratory infections and ultimately died at 8 months. Cultured fibroblasts synthesized both normal type I collagen and unstable type I collagen harbouring a structural defect in the alpha 1 (I) cyanogen bromide-derived peptide number 8 (CB8) region of the molecule, indicating a heterozygous dominant mutation. At birth, the radiological picture was that of the "thin bone"-type of congenital OI (OI type IIB/III in the Sillence classification); at the age of 12 weeks ribs and long bones had undergone a marked expansion giving a very different picture, that of the "thick bone"-type congenital OI (OI type IIA). The mechanism responsible for this change in bone structure is not known, but fractures and callus formation are unlikely to be the only factors. Caution is needed in the interpretation of radiographs of newborns with OI for prognostic or genetic purposes.