A 63-year-old woman with psoriatic arthritis involving her knees presented for evaluation of 9-months of pain in the left knee. Physical examination was notable for a nontender, palpable mass in the left popliteal fossa. Point-of-care musculoskeletal ultrasonography is shown. What is the most likely diagnosis?
一名63岁女性,患有累及膝关节的银屑病关节炎,因左膝疼痛9个月前来就诊。体格检查发现左腘窝处有一个无压痛、可触及的肿块。床旁肌肉骨骼超声检查如图所示。最可能的诊断是?

A. Cruciate ligament cyst交叉韧带囊肿
B. Deep vein thrombosis深静脉血栓形成
C. Pes anserine bursitis鹅足滑囊炎
D. Popliteal synovial cyst (Baker’s Cyst)腘窝滑囊囊肿(贝克氏囊肿)
E. Pseudothrombophlebitis假性血栓性静脉炎
答案解析:
诊断为腘窝滑囊囊肿(又称贝克氏囊肿)。这是由于膝关节内的滑液流入并积聚在腓肠肌-半膜肌滑囊中所形成的。贝克氏囊肿通常与潜在的关节疾病相关,包括骨关节炎、创伤性损伤或炎症性关节炎(如本例所示)。诊断并不一定需要影像学检查,但影像检查有助于排除其他疾病。
正确答案:D
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