There is a thick walled fluid filled bursa between the Achilles tendon and the calcaneal bone. The color Doppler images show hypervascularity of the bursal wall.
A minimal amount of fluid in the retrocalcaneal bursa can often be found.
A retrocalcaneal bursitis is caused by friction of the Achilles tendon over the upper part of the calcaneal bone. It is often an overuse injury found in athletes.
Signs indicating a bursitis are
- A rounded contour
- A thick wall
- Increased echogenicity of Kagers fat
A retrocalcaneal bursitis is often found in combination with a tendinosis or tendinopathy of the distal Achilles tendon. Common signs of an Achilles tendinosis or tendinopathy are
- Swelling of the tendon
- Inhomogenous hypoechoic aspect
- Loss of the normal fibrillar pattern
- Hypervascularity or neovascularity
In this case there is only slight swelling of the tendon and the normal fibrillar pattern is preserved. There is however a marked hypervascularity.
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