Histological section of a normal lung of another Leopard tortoise compared to histological section of the lung of the affected Leopard tortoise with Mycoplasma organism seen under electron microscopy. (A) Normal lung, (B) chronic hyperplastic pneumonia in a Leopard tortoise and (C) Mycoplasma organism (arrows) seen under electron microscopy. Note the hyperplastic epithelium (e), presence of inflammation (arrows) and fibrosis (*) in the affected tortoise. Faveolar spaces (f) and smooth muscle (s) are included for reference. Masson’s trichrome, ×10.