Skin Other - Pathology

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Seborrhea



Sebaceous Adenitis

Pigmentation disorders

Hypopigmentation

Hyperpigmentation

Eosinophilic infiltration

Eosinophilic Plaques

Eosinophilic granulomas

  • Involves cats, dogs, horses
  • Collagen degeneration in lesions os eosinophil degranulation
  • Often involved in reaction to parasites, foreigh bodies or mas cell tumours
  • Grossly:
    • Papules, nodules, plaques, ulcers in skin
    • Nodules or ulcers in oral mucosa of cats and dogs or on foot pads of cats
  • Microscopically:
    • Nodular dermatitis or stomatitis
    • Fragments of degenerated collagen surrounded by eosinophils and macrophages


Eosinophilic folliculitis and furunculosis

  • Rare in cats, dogs, cattle and horses
  • Possibly due to arthropod bites
  • May be multifocal in horses

Sterile granulomatous disorders

Juvenile pyoderma

  • Also known as Juvenile sterile granulomatous dermatitis and lymphadenitis, juveline cellulitis, puppy strangles
  • Involves dogs of less then 4 months of age
  • Grossly: pustular and nodular dermatitis with oedema involving the face, ears, mucocutaneous junctions
  • Microscopically: granulomatous or pyogranulomatous perifolliculitis, paniculitis and dermatitis

Equine generalised granulomatous disease

  • Also known as Sarcoidosis
  • In horses
  • Rare
  • Involves cutaneous lesions and systemic disease causing anorexia and weight loss
  • Grossly: alopecia, scales, crusts, sometimes nodules and masses
  • Microscopically: multifocal granulomas, multinucleated giant cells