Cow foregut showing multiple warty growths (papillomas). These have grown from the gut lining, which is formed of squamous epithelium (consisting of flat, thin cells). These benign (non-cancerous) tumours can be caused by papillomavirus infection.

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Cow foregut showing multiple warty growths (papillomas). These have grown from the gut lining, which is formed of squamous epithelium (consisting of flat, thin cells). These benign (non-cancerous) tumours can be caused by papillomavirus infection. Michael Frank, Royal Veterinary College. Attribution-NonCommercial 4.0 International (CC BY-NC 4.0). Source: Wellcome Collection.