Familial arteriovenous malformations (AVM's) are uncommon entities, with only seven reported cases in the English literature. Some have been associated with hereditary telangiectasia. A family in which AVM's were found in four male members of two generations is reported. In addition, one patient had a large cyst associated with his AVM without previous evidence of acute hemorrhage, which is an uncommon presentation. The family is discussed and a brief review of the literature is presented.