Korean J Radiol.  2008 Aug;9(4):375-378. 10.3348/kjr.2008.9.4.375.

MR Imaging Features of Obturator Internus Bursa of the Hip

• Hwang JY
• Lee SW
• Kim JO

• KMID: 1076465
• DOI: http://doi.org/10.3348/kjr.2008.9.4.375

Abstract

The authors report two cases with distension of the obturator internus bursa identified on MR images, and describe the location and characteristic features of obturator internus bursitis; the "boomerang"-shaped fluid distension between the obturator internus tendon and the posterior grooved surface of the ischium.

Keyword

Bursa; Magnetic resonance (MR); Pelvis, MR; Hip, MR

MeSH Terms

Adult
Bursitis/*diagnosis
*Hip Joint
Humans
*Magnetic Resonance Imaging
Male

Figure

• 

  Fig. 1 Illustration showing anatomy of obturator internus bursa on posterior oblique (left) and left lateral pelvic CT views (right). GT = greater trochanter of femur, IS = ischial spine, I = ischium, SG = superior gemellus muscle and tendon, OI = obturator internus muscle and tendon, IG = inferior gemellus muscle and tendon, obturator internus bursa (red area)

• 

  Fig. 2 28-year-old man with diffuse pelvic infection and reactive bursitis of obturator internus bursa. A. Transverse fat-suppressed Gd-enhanced T1-weighted MR image shows fluid collection with enhanced thin peripheral rim (arrows) between ischium (I) and obturator internus muscle and tendon (arrowheads). Inflammation was also noted in right inguinal area, lesser pelvis, and along sciatic nerve. B. Follow-up MR image 12 days later showing complete disappearance of fluid in obturator internus bursa and of soft tissue enhancement in right pelvic area.

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  Fig. 3 33-year-old male with calcific tendinitis of obturator internus tendon and infected bursitis. A. Transverse fat-suppressed Gd-enhanced T1-weighted MR image showing boomerang-shaped obturator internus bursitis (arrows) between obturator internus muscle and posterior surface of ischium (I). Obturator internus tendon, inferior gemellus muscle, and soft tissue around sciatic nerve (arrowheads) show strong enhancement in this image. B. Sagittal fat-suppressed Gd-enhanced T1-weighted MR image demonstrating location of obturator internus bursa (arrows), which lies anterior to obturator internus or inferior gemellus tendon (arrowheads) and posterior to ischium (I). C. Transverse multidetector CT maximum intensity projection image showing high density in posterior aspect of right hip joint, which represented calcific tendinitis (arrows) along obturator internus tendon.

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