Résumé:
Tumors in ruminants are abnormal growths of cells that can occur in any part of the body.
They can be benign or malignant but certain tissues develop only malignant forms
(lymphoma, glioma, etc...), and can cause various clinical signs depending on their location
and size . The most common tumors in ruminants are lymphoma, leukemia, squamous cell
carcinoma, and melanoma.
Tumor or also called neoplasm refers to new cell growth. It is popularly known as tumor
(swelling), but not all swelling is considered as a neoplasm. This neoplasm study is called
oncology, oncos - tumors, logy- study.. whereas all tissues and organs may be impacted, at
different frequencies and preferred locations wich depends on species, race, age, gender,
exposure to potentially carcinogenic substances.
A few of the most common tumors, such as lymphoma and spinocellular carcinoma have
better documentation.. So on the other hand, ocular squamous cell carcinoma manifests as
an infiltrating palpebral mass in adult cattle with low periocular pigmentation.in the
similar way, juvenile and dermal forms of LBS affect young dairy cattle with
polyadenomegaly or skin nodules. Nevertheless other tumor processes, that are related to
the organ involved in the primary tumour or metastases.
Histology examination is the microscopic examination of tissues to study the appearance of
cells and tissues in order to diagnose tumors such as another diseases . It is an important
tool for the diagnosis of cancer. Hence it is the confirmatory exam of tumors ,. Usually the
immunohistochemistry is the most frequent histological examination
Necropsy can be used to diagnose tumors , It is a postmortem examination of an animal to
determine the cause of death or to evaluate pathological conditions. it is the ultimate
diagnostic destiny of most of the experimental animals.
The diagnosis by necropsy can still be used to implement prevention at the flock level
whenever possible due to the impact of tumors which can result in reduced production and
trade restrictions.
Finally even if all animal species can develop neoplasia and all organs can be affected, The
economic and medical consequences of tumours in ruminants are also often
underestimated.
