Page 1314 - Equine Clinical Medicine, Surgery and Reproduction, 2nd Edition

Skin 1289

VetBooks.ir 12.95 12.96

Fig. 12.95 Acute
D. congolensis scald with
lameness and swelling Fig. 12.96 Chronic D. congolensis lesion with
above the fetlock. marked matting of hair, pain and lameness.

• Chorioptic mange mostly affects draught horses, 12.97
but has been isolated from other breeds. Very
pruritic, contagious. Mites are usually easy to
find on skin scrapings.
• Photosensitisation dermatitis: systemic
(phylloerythrin), involves white pasterns
and other white areas (e.g. nose and lower
extremities).
• Pastern leucocytoclastic vasculitis: solar
aggravated condition often isolated to the white
distal limbs (although can occasionally affect
pigmented skin of the distal limbs).
• Immune-complex vasculitis: purpura
haemorrhagica (Fig. 12.98) and strangles
vasculitis (Fig. 12.99). Fig. 12.97 Fusiformis infection with all four feet
• Mycetoma (Fig. 12.100). affected by exudative coronitis. This horse also had
• Idiopathic pastern dermatitis. severe liver infection.
• Pastern folliculitis.

Management Prognosis
Proper management relies on a careful and cor- Overall it is very difficult to give a prognosis because
rect diagnosis, which is extremely difficult with this of the likelihood of only a partially correct diagnosis
syndrome. and management programme.