18-year-old female with previously treated right forearm venous malformation, now with recurrent symptoms. Question recanalized malformation versus persistent anomalous vessels. There is a lesion extending from the mid distal anterolateral aspect of the forearm to the proximal first carpal row with an exuberantly serpiginous and dilated appearance. This lesion measures approximately 2.0 x 2.2 cm (series 6, image 21) and 15.2 cm long (series 4, image 15). The lesion contains increased T2 signal and decreased T1 signal and enhances after contrast administration, suggestive of a vascular or lymphatic malformation. There appears to be infiltration into the superior and deep muscles of the forearm. The lesion also traverses through the flexor tendons, for example completely surrounding the flexor pollicis longus tendon (series 6, image 14).
Vascular or lymphatic malformation of the mid distal forearm to the proximal carpal bones.