Background: Previous studies suggest that semicircular canal dehiscences (SCDs) have a developmental origin. Objective: We hypothesized that if SCDs originate during development, incidence of radiographic SCDs in young children will be higher than in adults. Materials and methods: Thirty-four temporal bone HRCTs of children younger than 2 years and 40 temporal bone HRCTs of patients older than 18 years were reformatted and re-evaluated for presence of SCD or canal thinning. Results: were compared with indications for HRCT and clinical information. Results: SCDs were detected in 27.3% of children younger than 2 years of age (superior, 13.8%; posterior, 20%) and in 3% of adults (P<0.004). Of children with one radiographic dehiscence, 55.6% had multiple and 44% had bilateral SCDs on HRCT. No lateral canal SCDs were present. Thinning of bone overlying the semicircular canals was found in 44% of children younger than 2 years and 2.5% of adults (P<0.0001). Conclusion: SCDs are more common on HRCTs of very young children. This supports the hypothesis that SCDs originate from discontinuation of bone deposition/maturation. However, SCDs on imaging do not necessarily correlate with canal dehiscence syndrome and should therefore be interpreted carefully.
All Science Journal Classification (ASJC) codes
- Pediatrics, Perinatology, and Child Health
- Radiology Nuclear Medicine and imaging
- High-resolution CT
- Posterior semicircular canal dehiscence
- Semicircular canal dehiscence syndrome
- Superior semicircular canal dehiscence