A 13-year-old girl had a venous malformation at her abdductor pollicis longus muscle of right forearm, with clinical presentation of local swelling, tenderness and inability to abduct her thumb.

• 摘要一位十三岁大的女孩于左前臂发现一肿块，造成局部肿胀、压痛并且无法做拇指的外展动作。经超音波检查后，发现此肿块具有典型的影像学特徵，因此诊断为静脉血管畸形。