الفهرس 
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Abstract
This study aimed to highlight the naturally occurring lesions in equine stomach,
In the current study 44 animals (35 donkeys and 9 horses) were used, after euthanasia the stomach was removed from the attached viscera, opened along its greater curvature and the contents were washed out by running cold water then prepared for histopathological examination.
The results of gross examination revealed hyperemia, edema, erosion, ulcers as well as gross parasitic lesion.
The results of histopathological examination were as follows:
A) Within the non glandular region the lesion included:
Hyperkeratosis, acanthosis, vacuolar degeneration, gastritis represented by hyperemia, edema, erosions, ulceration, scaring and angiogenesis in addition to gasterophilosis.
B) At the margo plicatus the lesions included:
Hyperkeratosis, vacuolar degeneration, inflammation characterized by hyperactivity of mucus glands up to periglandular fibroplasia as well as glandular metaplasia.
C) Within the glandular region:
Gastritis was shown by hyperemia, hemorrhage, glandular dysplasia and periglandular fibroplasia as well as parasitic infestation (Habronema spp. and Draschia megastoma)
This study is a preliminary one as an overview of gross and microscopic characters irrespective to etiology, age, sex or seasonal variations. More advanced study is recommended for correlation between lesions and their related factors especially causative agent.
It was obvious that the lesions did not differ either in horses or donkeys and there were no species specific lesions detected. The main difference was in the severity of lesions which was more severe in donkeys.