Dynamic Ultrasonography for Imaging Pediatric Fat Pad Herniation through the Lateral Patellar Retinaculum

A 3-year-old boy was found to have a painless mass over his right anterior lateral knee for the previous 6 months. The mass was hardly identified during knee extension and became visible upon squatting. There was no specific finding on ultrasound imaging over his right knee at the supine extended po...

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Published inDiagnostics (Basel) Vol. 12; no. 10; p. 2523
Main Authors Wu, Wei-Ting, Chang, Ke-Vin, Wu, Kuan-Wen, Mezian, Kamal, Ricci, Vincenzo, Özçakar, Levent
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.10.2022
MDPI
Subjects
Adults
Asymptomatic
Care and treatment
Cartilage
Case reports
Case studies
child
Children
Conflicts of interest
Cysts
Diagnosis, Ultrasonic
diagnostic imaging
Diseases
fat pad
Interesting Images
Knee
Magnetic resonance imaging
Methods
Patellar tendon
Pediatrics
sonography
Ultrasonic imaging
Taiwan
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Summary:A 3-year-old boy was found to have a painless mass over his right anterior lateral knee for the previous 6 months. The mass was hardly identified during knee extension and became visible upon squatting. There was no specific finding on ultrasound imaging over his right knee at the supine extended position. During squatting, ultrasound imaging showed an ill-demarcated hyperechoic mass protruding next to the cartilage overlying the distal femur towards the subcutaneous layer through a slit over the lateral patellar retinaculum. Herniation of the fat pad through a defect in the lateral patellar retinaculum was diagnosed. Our case highlights the usefulness of ultrasound examination as regards the lateral patellar retinaculum defect in pediatric knees, as well as its capability for dynamic scanning to capture the exact “pathological moment”.
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ISSN:2075-4418
2075-4418
DOI:10.3390/diagnostics12102523