严重溃疡，非腺体鳞状黏膜，成年马

Endoscopic view of the margo plicatus of the stomach in an adult horse, showing severe ulceration, with active ulcer beds and mild hemorrhage. No lesions are evident in the glandular mucosa. The score of the squamous mucosa is grade 4/4 (extensive lesions, with areas of apparent deep ulceration).