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Malignant seminoma with systemic metastases in a dog.

A three-year-old male crossbred dog was presented with multiple cutaneous nodules on the dorsum. Unilateral testicular enlargement ensued. Histopathological examination of testicular tissue and the skin lesions revealed a malignant seminoma. Despite the initiation of adjuvant chemotherapy, the dog died three months later due to systemic metastases of the seminoma to the skin, scrotum, eyes, liver, kidney and peritoneum.