NEJM - Baker’s Cyst A 63-year-old woman with psoriatic arthritis presented with a 9-month history of pain in the left knee. A nontender, palpable mass was present in the left popliteal fossa, which had a “speech bubble” shape on ultrasonography. https://t.co/7wBnkDoUaX https://t.co/m0AhRnDc4c