Small colon lesions

Predispositions to disease

-smaller diameter than colon = site of  obstruction of stones and fecoliths

-mesentery (and vascular supply) can tear off  with extensive rectal prolapse ; this means the bowel dies

-Arabs, minis, ponies and younger horses are predisposed to small colon lesions (better able to maintain hydration by removing water from ingesta?)

Clinical signs

Most horses with small colon impactions tend to have more mild signs of pain. Even with vascular compromise, initial transient signs of severe abdominal pain -> depression and less severe pain. However, younger horses with small colon impactions can be very painful.

Due to the minimal signs, surgery is often delayed. This can lead to undetected deterioration in the horses’ condition.

Small colon impactions are potentially associated with a greater risk of Salmonellosis

Notable

This is a poor area for healing

• high mural collagenase
• poor blood supply
• high bacterial counts
• firm formed manure passes by

Resources

Ponies, miniatures, and younger equids are at higher risk of fecalith obstruction compared to a general colic population. JAVMA | APRIL 2024 | VOL 262 | NO. 4