The medical management of idiopathic chylothorax in a domestic long-haired cat.

A 3-year-old, spayed female domestic long-hair was evaluated for a 2-week history of progressive tachypnea. Chylothorax was diagnosed through radiographic and pleural fluid evaluation. No primary cause was identified and the cat was managed medically. Thoracocentesis, dietary management, and oral rutin therapy resulted in substantial improvement of this idiopathic condition.