Deep vein thrombosis MRI

Editors-in-Chief: C. Michael Gibson, M.S., M.D. Associate Editor-In-Chief: Ujjwal Rastogi, MBBS [mailto:urastogi@perfuse.org]

Overview
Noninvasive technique like ultrasonography and impedance plethysmography are fairly accurate ways to diagnose deep vein thrombosis (DVT) of the legs. But, both tests miss calf-vein thromboses, repeat testing often is required when initial tests are negative, and ability to assess pelvic veins is limited. Magnetic resonance venography has an important role in diagnosis when contrast venography cannot be performed due to patients allergy to contrast material or in renal insufficiency.

In a double blinded study, involving 85 patients suspected of having DVT, magnetic resonance venography (MRV) was compared with contrast venography, and was found to have 100% sensitivity and 96% specificity. In this study, DVT was documented by contrast venography in 27 (27%) venous systems. Results of MRV and contrast venography were identical in 98 (97%) of 101 venous systems, whereas results of duplex scanning and contrast venography were identical in 40 (98%) of 41 venous systems. All DVTs identified by contrast venography were detected by MRV and duplex scanning. Thus it was concluded that MRV is an accurate noninvasive venographic technique for the detection of DVT.

To read more about MRA, click here.