A calf with a lymphoproliferative disease resembling human mycosis fungoides, had multiple, ulcerated skin nodules with enlarged regional lymph nodes. Tumor cells were 10–15 μm in diameter and had round to oval nuclei without indentations. Mitoses were regularly present. Pautrier's microabscesses were in the epidermis, and T-cell areas of regional lymph nodes were infiltrated by neoplastic cells. Demonstration of the T-helper/inducer origin of neoplastic lymphocytes suggested classification in analogy with human mycosis fungoides.
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