A 6-year-old, spayed female Himalayan cat with idiopathic chylothorax, which failed to respond to medical management, was successfully treated by advancement of the omentum into the thorax. Exploratory thoracotomy revealed severe, constrictive pleuritis as a sequela to chylothorax. Because of the poor prognosis for recovery from chylothorax in cats with thoracic duct ligation alone, and the lack of success in performing thoracic duct ligation in this cat, the omentum was advanced into the thorax through a hole created in the diaphragm and sutured within the thoracic cavity. The cat recovered from surgery and is clinically normal 13 months postoperatively. Omental advancement may be an effective surgical management technique for this challenging disease in cats.

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