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Hip Joint Synovial Cyst

Case Detail

Anatomy: Musculoskeletal
Joseph Junewick, MD FACR
Diagnostic Category: Infectious-Inflammatory
Created: over 10 years ago
Updated: over 10 years ago
Tags: PEDS
Modality/Study Types: US
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3 year old with herniation of cystic mass through a healed inscision over the left hip.

Case Images


Hip Joint Synovial Cyst

Clinical Notes

History of open reduction and tenotomy for hip dysplasia.

Inflamed synovium extending into the subcutaneous soft tissues, arising from the anterior hip joint capsule near a suture granuloma found at surgery.


US – Contained complex subcutaneous fluid collection funneling toward the hip joint.


Herniations of synovium through the joint capsule (i.e., synovial cysts) may be unilocular or multilocular. These herniations are prone to dissection into adjacent soft tissues, rupture and infection and can compress structures. At least 15 synovial bursae are found about the hip. Any condition resulting in a joint effusion and increased intraarticular pressure predisposes to formation of synovial cysts.


Sartoris DJ, Danzig L, Gilula L, Greenway G, Resnick D. Synovial cysts of the hip joint and iliopsoas bursitis: A spectrum of imaging abnormalities. Skeletal Radiol (1985); 14:85-94.

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