Actavia 0 Blaszak, B. Walkowski, M. Ibbs, M. Jaskowski, J.M. 2009 2009-8-31 379-381 This case report concerns a two year old female mongrel weighing about 25 kg which was admitted to an animal shelter. A grapefruit-sized mass was found in the animal's left ovary during a routinely performed ovariohysterectomy. On sectioning, the mass revealed cysts containing tufts of hair in creamy white sebaceous fluid. A histological examination revealed a mixture of tissues. The tumor was diagnosed as a mature teratoma (teratoma adultum). 8 54