62 yo active M with dorsal ankle pain and swelling
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Patient is a runner. Probably frictional. I think his inferior extensor retinaculum is thickened and irregular and possibly chronically sprained. The extensor tendon diagram hidden image is from the radsource article referenced here. Reference article.
extensor digitorum longus and peroneus tertius tendinosis and tenosynovitis( RID3187 )