The most common tumors in ruminants are lymphoma, leukemia, squamous cell carcinoma, and melanoma. Some of the more common tumors, such as lymphoma and squamous cell carcinoma, are better documented. On the other hand, ocular squamous cell carcinoma manifests as an infiltrating eyelid mass in adult cattle with poor periocular pigmentation. Similarly, juvenile and dermal forms of LBS affect young dairy cows with polyadenomegaly or skin nodules. However, other tumor processes, related to the organ involved in the primary tumor or metastases, are also possible. Histological examination is the...

The most common tumors in ruminants are lymphoma, leukemia, squamous cell carcinoma, and melanoma. Some of the more common tumors, such as lymphoma and squamous cell carcinoma, are better documented. On the other hand, ocular squamous cell carcinoma manifests as an infiltrating eyelid mass in adult cattle with poor periocular pigmentation. Similarly, juvenile and dermal forms of LBS affect young dairy cows with polyadenomegaly or skin nodules. However, other tumor processes, related to the organ involved in the primary tumor or metastases, are also possible. Histological examination is the...