Congenital fibropapillomatosis in a piglet

We report a case of congenital fibropapillomatosis in the head and neck of a piglet from a swine breeding farm where sporadic cutaneous papillomas of the prepuce and scrotum had previously occurred in several boars. Histologi cally, the tumor consisted of multiple exophytic, papillary projections com posed of branching, densely cellular, fibrovascular stalks covered by hyper plastic keratizing squamous epithelium. Ultrastructural examination failed to reveal viral particles. Cutaneous papillomatosis is rare in swine. To th e best of our knowledge, this is the second report of congenital fibropapil lomatosis in pigs.