GUNNAR KRAAG, M.D., F.R.C.P.(C); ERIC MANO THEVATHASAN, M.B.B.S., M.R.A.C.P.; DUNCAN A. GORDON, M.D., F.R.C.P.(C), F.A.C.P.; IRWIN H. WALKER, M.B.B.S., F.R.C.P.(C), F.R.A.C.P.
KRAAG G, THEVATHASAN EM, GORDON DA, WALKER IH. The Hemorrhagic Crescent Sign of Acute Synovial Rupture. Ann Intern Med. 1976;85:477-478. doi: 10.7326/0003-4819-85-4-477
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Published: Ann Intern Med. 1976;85(4):477-478.
Popliteal synovial cysts are common in patients with rheumatoid arthritis. They may rupture and produce clinical features indistinguishable from acute thrombophlebitis (1). As well, Tibbutt and Gunning (2) reported that calf hematomas may mimic thrombophlebitis. They described four patients with calf hematomas with crescentic bruising beneath the malleoli in whom venograms were normal. They concluded that intramuscular hemorrhage should be suspected on the basis of this crescent sign. We report here two patients with synovial rupture in whom the "hemorrhagic crescent sign" enabled us to exclude acute thrombophlebitis and to avoid needless and potentially hazardous anticoagulant therapy (3).
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