Echocardiogram results indicate an avm. ct scan of chest and mri & mra of brain are still negative. where else might the avm be?

Anywhere: Arteriovenous malformation or avm is an abnormal connection between arteries and veins, bypassing the capillary system. The congenital vascular anomaly occurs commonly in the central nervous system, but can appear in any location. Although many avms are asymptomatic, they can cause intense pain or bleeding or lead to other serious medical problems.