Petrous apex lesions in the pediatric population

Area of Science:

• Pediatric Radiology
• Neuroradiology
• Head and Neck Imaging

Background:

• Petrous apex lesions in children are frequently discovered incidentally.
• Differential diagnoses span various categories including neoplastic, infectious, inflammatory, and developmental conditions.
• Some pediatric petrous apex lesions mirror adult presentations, while others are unique to childhood.

Purpose of the Study:

• To provide a comprehensive pictorial review of computed tomography (CT) and magnetic resonance imaging (MRI) findings of pediatric petrous apex lesions.
• To highlight imaging features that help differentiate between various types of petrous apex pathologies in children.
• To emphasize conditions more prevalent in pediatric populations, such as Langerhans cell histiocytosis (LCH) and pediatric malignancies.

Main Methods:

• Review of CT and MRI imaging studies of pediatric patients with petrous apex lesions.
• Categorization of lesions based on imaging characteristics and histopathological correlation where available.
• Comparison of imaging findings with known adult petrous apex pathologies.

Main Results:

• Common pediatric petrous apex lesions include Langerhans cell histiocytosis (LCH), neuroblastoma, rhabdomyosarcoma, and Ewing sarcoma.
• Lesions like cholesterol granuloma, cholesteatoma, and chondrosarcoma are rare in children compared to adults.
• Imaging findings are presented to illustrate the diverse spectrum of pediatric petrous apex abnormalities.

Conclusions:

• Accurate interpretation of CT and MRI is crucial for diagnosing petrous apex lesions in children.
• Understanding the age-specific prevalence of these lesions aids in narrowing the differential diagnosis.
• This pictorial review serves as a valuable resource for radiologists evaluating pediatric head and neck imaging.