Abstract
We discovered the case of a male Japanese Short horn calf which had thumd-sized neoplasms on its head and hindquarters at birth. The neoplasm on the hindquarters fell off after the calf was born, but it appeared again and grew bigger and bigger later, while the neoplasm on the calf's head fell off 20 days after the calf was born. It was a little bit swollen after that. Although the vigor and appetite of the calf were fine, some dysuria and paralysis of the hindquarters were recognized at about 40 days of age, and the calf became unable to walk. It was killed by bloodletting at 58 days of age and was pathologically examined. While studying the results, masses of neoplasm were found all over the internal organs. Histopathologically, the neoplasm cells developed several shapes, such as a round shape, a spindle shape, and various other shapes, all of various sizes. A few cells with some yellow-brown granules were recognized and showed fontana-masson chromatic positive in eytoplasm. The nucleus had a clear cell with a round shape, and a number of cell segmentations were recognized. Based on these results, this case was diagnosed as melanoma.
