A large pelvic arteriovenous malformation in an adult patient with cystic fibrosis.

We present a prepubertal male cystic fibrosis patient with high circulating oestrogen levels (as a consequence of sever cystic-fibrosis-related hepatobiliary disease) who subsequently developed a large pelvic arteriovenous malformation. This has not previously been described in patients with cystic fibrosis, despite the association between high oestrogen levels and arteriovenous malformations. The aetiology and treatment options of arteriovenous malformations are discussed.