Invagination of the caecum into the colon in a Welsh pony.

The research article discusses a case of chronic wasting disease in a 16-month-old Welsh pony, characterized by gradual appetite and weight loss, that eventually led to death. The autopsy revealed that the caecum (part of the horse’s digestive system) had invaginated into the colon, causing the observed illness and death.

Chronic Wasting Disease in Welsh Pony

The research focuses on a 16-month-old Welsh pony filly that died from chronic wasting disease, which is a disease characterized by:

• Progressive loss of appetite and weight: The Welsh pony filly gradually began to eat less and lost a significant amount of weight in the process.
• Sub-acute colic: This is abdominal pain which was the first sign of illness in this pony.

Findings of the Post-mortem Examination

The post-mortem examination of the dead Welsh pony led to a significant discovery:

• A completely invaginated caecum into the colon: The caecum is a pouch located at the beginning of the large intestine that aids in digestion, especially in the digestion of plant material. In this pony, the caecum had turned back into the colon, suggesting it was the root cause of the illness and eventual death.

Comparison with Previous Literature

The article compares the findings to literature review:

• Two distinct clinical syndromes from caecal invagination: Previous researches revealed that severe caecal invagination can cause two different types of clinical syndromes – either acute illness characterized by severe colic and death, or a chronic wasting disease which may not result in death for several weeks or even months, as in this case.