Page 707 - Equine Clinical Medicine, Surgery and Reproduction, 2nd Edition

682 CHAPTER 3

VetBooks.ir 3.135 3.136

Fig. 3.135 S. equi infection (‘strangles’) causes a Fig. 3.136 This horse with S. equi infection has a
moderate to profuse bilateral mucopurulent nasal draining submandibular lymph-node abscess. Abscesses
discharge. can also develop in the parotid and retropharyngeal
lymph nodes. (Photo courtesy Paul Lunn)

3.137 3.138

Fig. 3.137 S. equi infection. Non-ruptured Fig. 3.138 Purpura haemorrhagica can be
retropharyngeal lymph nodes can be become large characterised by large plaques of proximal limb and
enough to compress the nasopharynx and trachea, causing ventral trunk oedema. (Photo courtesy Paul Lunn)
dyspnoea. This radiograph shows ventral deviation of the
trachea caused by a large non-ruptured retropharyngeal
lymph-node abscess. (Photo courtesy Paul Lunn) unilateral purulent nasal discharge. There is usually no
obvious guttural pouch swelling externally. The pouch
may be painful on percussion or palpation. Metastatic
Large, unruptured retropharyngeal abscesses can abscessation presents with clinical signs relating to the
cause moderate to marked airway compression, with region where abscesses develop, with more generalised
ventral deviation of the trachea and occlusion of the signs including weight loss, intermittent pyrexia and
nasopharynx (Fig. 3.137), resulting in difficulties anorexia. Purpura haemorrhagica cases show wide-
with swallowing (presenting as ‘choke’), inspiratory spread subcutaneous oedema (Fig. 3.138) with pete-
dyspnoea and possibly stertorous inspiratory noise. chial haemorrhages, possibly skin sloughs and clinical
Guttural pouch empyema causes intermittent, mostly signs relating to visceral injury.