Title
The petromastoid canal in the young child : appearance on computed tomography The petromastoid canal in the young child : appearance on computed tomography
Author
Faculty/Department
Faculty of Medicine and Health Sciences
University Hospital Antwerp
Publication type
article
Publication
Amsterdam ,
Subject
Human medicine
Source (journal)
International journal of pediatric otorhinolaryngology. - Amsterdam
Volume/pages
77(2013) :5 , p. 803-807
ISSN
0165-5876
ISI
000318384000036
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Objective The adult petromastoid canal (PMC) is a thin anatomical structure, but in young children, it can be wide on high resolution CT (HRCT) scans. We performed this study to evaluate the year-by-year change in width and shape of the PMC in the young child. Materials and methods We retrospectively reviewed temporal bone HRCT scans, performed between 2007 and 2012. Eighty children were included (age range: 0.36.9 years; median age: 3.1 years; 56% male). All scans had a slice thickness of ≤1 mm. Results The average width of the PMC was 1.95 mm in children <2 years, compared to 0.83 mm in children ≥2 (p < 0.001). We categorized the PMC into 4 subtypes. A bulky (type III) PMC was predominant <2 years. A thin curvilinear (type I) PMC was more prevalent in the older children. Type II and IV PMC were found infrequently. The PMC width correlated inversely with the degree of pericapsular ossification (p < 0.001), and mastoid pneumatisation (p < 0.001). Conclusion A wide PMC (≥1 mm) is a common finding in children <2 years. As children grow older, the PMC progressively narrows. This correlates to increased temporal bone pneumatisation and ossification of the otic capsule.
E-info
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