A report of fourteen spontaneous tumors of the guinea pig.

Fourteen guinea pig tumors were received by the Purdue University Animal Disease Diagnostic Laboratories over a period of 5 yr. Among them were 2 mammary gland adenocarcinomas, a mammary gland adenoma, a malignant mixed tumor of the mammary gland, a Schwannoma, 2 limpomas, an inflammatory polyp of the ear canal, a uterine fibroma, 3 trichoepitheliomas, an undifferentiated carcinoma, and a histiocytic lymphosarcoma. The pathologic features of these neoplasms were presented in this report.