MRI signs in deep venous thrombosis.

The MR features of gastrocnemius and soleus DVT include a tubular branching structure with variable intraluminal signal on proton density-weighted fat-suppressed images that most commonly present with decreased signal centrally and peripheral increased signal (Fig. 8a) In other patients the degree of intraluminal increased signal varies from complete (Fig. 2a) to moderate (Fig. 9a) The thrombosed vessels may be distended (Fig. 9b, 9c). On T1-weighted images the intraluminal signal is often increased. Perivascular soft tissue edema and edema in the adjacent musculature is common (Fig. 10a). No prospective studies have been performed to test the specificity, sensitivity and accuracy of these MR findings so it is imperative that duplex sonography is performed for correlation if these MR findings are present.

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