TERATOMA DELL’OVAIO IN UNA MANZA.

umours of the ovary, except in the canine species, are rare in domestic animals and are mainly found in old subjects. In domestic mammals and human teratomas are infrequent, complex, dysontogenetic neoplasm, characterised by the presence of tissues originating in serous membrane extraneous to the organ in which they are found. The authors report a case of a mali- gnant ovary teratoma weighing about 40 kg in a 15 month-old Simmenthal heifer and describe its histopathological features.