This patient had prior deep venous thrombosis and underwent thrombolysis. There were no documented complications post diagnosis and treatment. She subsequently presented with acute calf pain after two years and was referred for a venous doppler assessment to exclude recurrent deep or superficial venous thrombosis.

Doppler assessment confirmed a residual, thin fibrous band/ membrane within the distal superficial femoral and proximal popliteal veins.

Recanalization of veins post-acute deep venous thrombosis involves a complex, multiphasic process of remodeling. A fibrous membrane may remain behind in the vein. This membrane is called a synechia (pleural - synechiae). These fibrous bands may easily be identified due to vascular flow on either side of the membrane within the vessel being interrogated as demonstrated above.