Groups of dogs were studied at varied intervals after autografting of tunica vaginalis from the testes to cover excised patches of tunica albuginea of the penis. Postoperative cavernosography revealed neither ballooning nor chordee. Histologically, the grafts were well accepted and uniformly merged with the neighboring collagen tissues at 6 mo. Tunica vaginalis would be ideally suitable for autografting to the penis after excision of Peyronie''s plaques.