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Variability in kyphomelic dysplasia
F Cisarik1, K Kozlowski, J Masel
1Department of Clinical Genetics, NsP Hospital, Zilina, Slovakia.
Insights
Kyphomelic dysplasia exhibits variable inheritance patterns, including potential autosomal recessive inheritance in siblings. This skeletal dysplasia presents differently, ranging from lethal forms to mild cases with spontaneous regression.
Area of Science:
- Medical Genetics
- Skeletal Dysplasias
- Pediatric Orthopedics
Background:
- Kyphomelic dysplasia is a rare skeletal dysplasia characterized by anterior bowing of the long bones and kyphoscoliosis.
- Understanding its genetic basis and clinical variability is crucial for accurate diagnosis and genetic counseling.
Observation:
- This study observed four infants with kyphomelic dysplasia from three distinct families.
- Variability in presentation and inheritance patterns was noted across the families.
Findings:
- One family showed sibling recurrence in females, suggesting possible autosomal recessive inheritance.
- Another family had a male infant with typical lethal kyphomelic dysplasia, diagnosed prenatally via ultrasound detecting short, bent femurs.
- A third family's female infant presented with severe radiographic changes at birth, but experienced a mild clinical course with near-complete resolution by age 7.
Implications:
- The findings highlight the phenotypic heterogeneity of kyphomelic dysplasia.
- This variability necessitates careful genetic evaluation and counseling for affected families.
- Recognizing the spectrum of severity is important for prognosis and management planning.
Abstract:
Four infants with kyphomelic dysplasia ascertained from three families demonstrate variability within the syndrome. In the first family, sibling recurrence in female sibs was noted with atypical kyphomelic dysplasias, suggesting autosomal recessive inheritance. In the second family, with a male affected with the 'typical findings' of lethal kyphomelic dysplasia, diagnosis of a skeletal dysplasia was suspected at 29-30 weeks' gestation following US detection of short, bent femurs. In the third family, with a female affected, severe radiographic changes were documented at birth. The clinical course of the disease was mild with almost complete regression of the radiographic findings at the age of 7 years.