Ocular Tumours in Animals *

— —A wide range of tumours may affect the ocular structures in many different animals and there is a marked difference in incidence of both common and uncommon varieties. One of the most common and important neoplasms of the domestic animal is the squamous cell carcinoma of the cow. Intraocular tumours are not common, retinoblastoma for example being extremely rare. Ocular tumours in animals may be classified on the same basis as their human counterparts. SUMMARY It has been recorded that all the spontaneous tumours in general that affect man with the exception of chorion carcinoma can also occur in animals. While tumours of the domestic animals have received most attention in the literature, there are also reports of tumours in wild animals. It is clear from the numerous articles on the tumours of domestic animals that there exists a marked difference in the incidence of both common and uncommon neoplasms. Tumours are found less frequently in animals which are often slaughtered for food at relatively early ages than in domestic pets which often survive into old age, and in laboratory animals which are often under close observation for long periods. One of the most common and important ocular tumours of the domestic animal is the squamous cell carcinoma of the conjunctiva in the cow. Intraocular tumours are not common, retinoblastoma for example being extremely rare. The ocular tumours occurring in animals are classified and reviewed in this paper, examples of these tumours are illustrated, and their incidence and aetiology are discussed. Résumé— —On connait chez de nombreuses espèces animales une grande diversité de tumeurs des organes de la vue, et la morbidité de ces tumeurs varie sensiblement, qu'il s'agisse de formes fares ou répandues. L'une des plus fréquentes et des plus importantes néoplasies observées chez les animaux domestiques est le carcinome à cellules squameuses, rencontré chez la vache. Les tumeurs intraoculaires sont peu fréquentes; les rétinoblastomes notamment sont extrêmement rares. Les tumeurs de l'oeil rencontrées chez les animaux sont susceptibles du même classement que les néoplasies analogues constatées chez l'homme. Zusammenfassung— —Die verschiedensten Tumoren können die Augenstrukturen bei vielen verschiedenen Tieren befallen, und es besteht ein deutlicher Unterschied hinsichtlich der Häufigkeit gewöhnlicher und seltener Arten. Eines der häufigsten und wichtigsten Neoplasmen des Haustiers ist das Plattenepithelcarcinom der Kuh. Intraoculare Tumoren sind nicht häufig, das Retinoblastom zum Beispiel ist äusserst selten. Die Augentumoren bei Tieren können auf der gleichen Basis wie die bein Menschen klassifiziert werden.