Faculty of Veterinary Medicine University of Zagreb
Abstract
The aim of this study was to show the natural occurrence of ocular neoplasms in dairy cattle kept in 8 dairy farms around Tehran consisting of approximately 5000 dairy cows, over a period of two years. Animal characteristics, type of husbandry and climatic conditions were recorded. Tumours were removed surgically and examined grossly and microscopically. In the present study 32 cases of ocular neoplasms were diagnosed. The affected animals were female (100%), adult and more than 50% of them aged more than five years. In most
of the cases (70%) the lesion were located in the nictitating membrane and palpebral conjunctiva. Intraocular invasion was noted in 7 cases (21.87%). Microscopically, in 12 cases out of 32 (37.5%) the tumours were noninvasive squamous cell carcinoma or carcinoma in situ; 18 cases (56.25%) were invasive squamous cell carcinoma; a single case (3.12%) was lymphosarcoma while a further single case (3.12%) was malignant hemangioendothelioma. The grade of malignancy was assessed for each case of neoplasms based on descriptions appearing in the literature. Most of the ocular neoplasms diagnosed were squamous cell carcinoma, mostly located in the nictitating membrane and palpebral conjunctiva.Cilj istraživanja bio je prikazati pojavu očnih novotvorina u tijeku dvije godine u približno pet tisuća mliječnih goveda držanih na osam mliječnih farmi u okolici Teherana. Prikazane su osnovne značajke životinja, tip uzgoja i klimatski uvjeti. Tumori su bili kirurški uklonjeni te pretraženi makroskopski i mikroskopski. Novotvorine oka ustanovljene su u 32 goveda od kojih je više od 50% bilo starijih od pet godina. Promjene su u većini slučajeva (70%) bile smještene na trećoj očnoj vjeđi i spojnicama. Intraokularne promjene zabilježene
su u sedam slučajeva (21,87%). Mikroskopski je u 12 (37,5%) slučajeva ustanovljen neinvazivni skvamozni karcinom ili karcinom in situ, u 18 (56,25%) invazivni skvamozni karcinom, u jednom (3,12%) je ustanovljen limfosarkom te također u jednom (3,12%) slučaju bio je ustanovljen maligni hemangioendoteliom. Stupanj malignosti za svaki tumor bio je određen na osnovi literaturnih opisa. Većinom je dijagnosticiran skvamozni karcinom, pretežno smješten na trećoj očnoj vjeđi i spojnicama vjeđa
