MRI confirms the presence of a voluminous lesion involving the anterior right thoracic wall. It creates an imprint on the liver without invading it, and a very small part of the lesion invades the pleura.
The lesion is hypervascular and contains many small & tortuous vessels, without flow voids, confirming the slow flow detected on the Doppler evaluation. It also has many small enhancing septations. It is mainly iso- to hypo-intense on T1, hyperintense on T2 & T2 fat-sat. However, there are no fluid-fluid levels.
A simple haemangioma would enhance more diffusely. It would also contain flow-voids and it is classically polylobulated. The presence of septations & tortuous slow-flow veins makes venolymphatic malformation the most plausible hypothesis.