A study published online September 18, 2026, in The Veterinary Journal reports that the ultrasonographic appearance of equine lungs changes significantly after exploratory celiotomy. The finding carries direct implications for how clinicians read post-operative thoracic imaging in horses.

A seven-author team led the research: Kate L. Hepworth-Warren, Javier Perez-Quesada, Kaitlyn Harbor, Yang Qu, Kimberly L. Hallowell, Alexandria Windrup, and Megan E. Ballou. The publication addresses a clinical question long familiar to equine surgeons: whether imaging findings or genuine pathology explain the unusual lung ultrasound results that often appear in horses recovering from abdominal surgery.

Exploratory celiotomy is the standard surgical approach to equine colic and other abdominal emergencies. The procedure involves a ventral midline incision to allow direct evaluation of the bowel and adjacent viscera. Horses that undergo the operation typically receive general anesthesia and recover in intensive care settings where thoracic ultrasonography forms part of routine post-operative monitoring.

Why does the procedure change lung ultrasound findings?

Thoracic ultrasonography in horses is a non-invasive, point-of-care imaging technique used to detect pleural fluid, pulmonary consolidation, and other parenchymal changes. The modality has become standard in equine internal medicine and critical care. The new report documents significant changes in lung ultrasound appearance after exploratory celiotomy.

The published report does not detail the underlying mechanism, but the clinical context suggests several possibilities. General anesthesia, recumbency during surgery, and post-operative fluid management all influence pulmonary parenchymal patterns. Post-operative inflammation and atelectasis are common after abdominal surgery and would alter ultrasound appearance in ways that mimic primary pulmonary disease.

Takeaway: Lung ultrasound changes after colic surgery may reflect the surgery itself, not a separate lung problem.

What does this mean for equine practitioners?

The practical impact falls on interpretation. A horse that develops abnormal lung ultrasound findings within hours or days of colic surgery may show changes driven by the surgical event rather than by an independent respiratory problem. Clinicians reading such scans will need to weigh the surgical context before assigning a diagnosis of primary pneumonia.

The findings also affect referral hospitals and ambulatory clinicians who use thoracic ultrasonography during the post-operative period. Standardized imaging protocols, paired with pre-operative baseline scans, may help distinguish surgical effects from new pathology. The publication adds to a small body of work on peri-operative pulmonary monitoring in horses.

Takeaway: A pre-operative lung scan and clear timing notes can prevent a post-operative misread.

What questions remain?

The published title indicates the central finding but does not report the timing of post-operative scans, the specific ultrasound changes observed, or the proportion of horses affected. Readers will need the full text for those details. Equine clinicians will watch for follow-up work that defines the duration of the changes, the imaging patterns most affected, and the prognostic implications for horses undergoing colic surgery.

Takeaway: The next report should define the timeline, the duration, and the outcome data.