Thymic hematomas are uncommon in animals, and the few reported cases are all in dogs. In May 2019, we necropsied a wild Eurasian otter (Lutra lutra) in Junju, Republic of Korea, and found a thymic hematoma without any signs of trauma or hemorrhage in other organs, except for a hemothorax. This study describes the macroscopic and microscopic examinations of a thymic hematoma in an Eurasian otter.

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