Inguinal panniculitis
Also known as Feline Pyogranulomatous Panniculitis
Cats develop a characteristic disease of panniculitis of the inguinal fat pads.
Clinical findings :This is a chronic disease with nodules and fistulas restricted to the inguinal fat pads.
Cause: Mycobacterial infection - Mycobacterium fortuitum, M. smegmatus, M. chelone, M phlei. Mycobacterium porcinum (Family: Mycobacteriacae, Fortuitum-vaccae clade, Genus: Mycobacterium) was added to this list.
Histopathology:
The lesions are within the inguinal fat, and are pyogranulomatous. There are lipid droplets at the center and within the reaction. Mycobacteria are located within these lipid droplets.
Cox A, Udenberg TJ. Mycobacterium porcinum causing panniculitis in the cat. Can Vet J. 2020; 61: 39-43.
Pancreatic panniculitis.
Panniculitis linked to pancreatic disease occurs rarely in cats. Pancreatitis is the main cause, but pancreatic neoplasia is also reported to induce this. It could be because of concurrent pancreatitis.
Vitamin E responsive panniculitis
This occurs in cats that are fed vitamin E deficient diets or diets high in oxidants. This causes fat necrosis that may resemb;e pancreatic panniculitis.