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====Pathogenesis====
====Pathogenesis====
[[Image:intussuceptionphoto.jpg|thumb|right|150px|Intersusception (Courtesy of Bristol BioMed Image Archive)]]
The proximal intestine invaginates into the adjacent distal portion, taking its mesenteric attachment with it. Compression of the mesenteric vessels obstructs venous drainage of the gut, resulting in venous congestion, leading to swelling and oedema.
*** Inflammatory exudate from serous surface.
*** Inflammatory exudate from serous surface.
**** Fibrinous adhesions form between surfaces making structure irreducible.
**** Fibrinous adhesions form between surfaces making structure irreducible.
** The condition is easilt reducible.
** The condition is easilt reducible.
==From Clinical==
==Clinical==
==Description==
'''Intussusception''' is the invagination of a segment an intestine into the lumen of the adjoining intestine. The intussusceptum is the invaginated segment and the intussuscipien is the enveloping segment. Intussusception most commonly affects young animals. In order animals, it may be occur due to [[Neoplasia - Pathology|neoplasia]] or [[Post-Mortem Change - Pathology #Agonal Changes|agonal changes]].
Intussusception results from vigorous contractions due to intestinal irritation, which force a segment of an intestine to teloscope into the lumen of a more relaxed adjacent segment. A normograde intussusception is the most common, but retrograde intussusception has also been reported. Intussusception normally occurs due to gastrointestinal disease, although it is often hard to identify the cause. Parasites, infectious enteritis, metabolic disorders, foreign bodies, history of recent intestinal surgery, intestinal masses have all been known to associate with intussusception. Chronic intussusception can occur with little haemodynamic changes.
Intussusceptions can occur along any length of the intestine, however, [[Colon - Anatomy & Physiology #Structure|ileocolic]] and jejunojejunal intussusceptions are the most common. More caudal intussusception can cause it to protrude from the rectum. This has to be distinguished from a rectal prolapse. In intussusception, it is possible to pass a probe next to the anus, but not in [[Rectal Prolapse|rectal proplapse]].
Initially, a partial obstruction results. Overtime, this progresses to a complete obstruction, with obstruction of venous return, arterial occlusion and avulsion of vessels. The intestinal walls become oedematous, ischaemic and turgid, resulting in devitalisation if not treated. Adhesion can occur in long standing cases due to fibrin deposition.
==Signalment==
==Signalment==
Image:Tabby-point.JPEG|'''Siamese''' <p> gccfcats.org
Image:Tabby-point.JPEG|'''Siamese''' <p> gccfcats.org
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==Diagnosis==
==Diagnosis==