57歲女士主訴下樓梯時,突然左腳後跟劇烈疼痛,隔天至骨科門診,接受腳後跟超音波檢查矢狀切面如圖,最可能之診斷為何?
Achilles tendinitis
Achilles tendon fibroma
Achilles tendon rupture
retro-calcaneal bursitis