الفهرس 
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Abstract
This study gives light on the most important oncology in poultry and knows the extent of the tumors among chicken flocks in different areas on the basis of strect inspection for necropsied birds and by histopathology and PCR investigation.Hundred-twenty five diseased or freshly dead birds from different domestic poultry flocks chickens flocks layers breeds as (lohman, novagen and native breed as Sasso) and sporadic cases were collected and necropsied between the period from Aug. 15, 2012 to Nov. 8, 2014 and samples from each case were collected. The collecting samples were subjected to the pathology and some selected ones (13) for PCR laboratory (stored freezing -20ºC). Liver, spleen, heart, lungs, kidneys, intestine, ovary, skin, nerve, eye and brain were the main examined organs.
In our study mostly of necropsied birds showed lesions of neoplasm then identify later.