Ovarian Teratoma in a dog

This is from a 3 years old female dog that had a pyometra. During surgery I have noticed that the left ovary was increased in size (about the size of a golf ball). The histoathology results showed an ovarian teratoma, and multiple cystic corpora lutea.. The tumor included neuronal tissue, keratinized cells and ciliary cells.  This is a benign tumor that is often found in young females.

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