The Gruberi bursa, or the bursa mucosa of Gruberi, is a bursa located in the dorsal region of the ankle that extends from the sinus tarsi and along the frondiform ligament to surround extensor digitorum longus tendons.
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Terminology
Defined as the bursa that lines the inferior extensor retinaculum (frondiform ligament) as it passes over the extensor digitorum longus tendons at the anterior ankle joint. It will only usually only be evident on imaging if distended and can be mistaken for tenosynovitis, thus also referred to as pseudotenosynovitis of the extensor digitorum longus tendons 2.
Differential diagnosis
tenosynovitis of the extensor digitorum longus tendons
Practical points
on ultrasound, it is most commonly unilocular, anechoic, and compressible 1
a distended bursa of Gruberi will extend from the sinus tarsi and wrap around the tendons, differentiating it from fluid due to tenosynovitis which will extend along the tendon
on MRI there will be usually signal or morphological changes of extensor digitorum longus associated with tenosynovitis
on MRI and ultrasound, the fat surrounding the extensor digitorum longus will be edematous and/or inflamed in tenosynovitis
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