These are birth defects that prevent a horse from passing feces. “Atresia” refers to a body orifice that is abnormally small or completely closed. Atresia ani is either an abnormally small or nonexistent opening at the anus. Atresia coli is where a section of the colon is missing.
The genetic basis for this birth defect is not clear and it is poorly understood. It can occur in any breed. It is not the same as Lethal White Syndrome, which is seen primarily in the American Paint breed.
Other Diagnoses Considered
Treatments May Include
Prognosis & Relevant Factors
Grave. In some cases, there may be a surgical approach but this is usually discouraged.