Lung lobe torsion.

Lung lobe torsion is a rare pulmonary disorder in small animals and in humans. Torsion occurs when the lung lobe rotates around the bronchus and vascular supply and remains in that position. Lung lobe torsion is a life-threatening condition. The patient may present in an acute, fulminant respiratory crisis; however, more subtle clinical signs have also been reported. Lung lobe torsion may be secondary to an underlying pathology or spontaneous and idiopathic. Surgical resection of the affected lung lobe is the treatment of choice. The prognosis depends on the underlying cause. This article reviews the incidence, pathophysiology, clinical signs, diagnostic approach, and treatment of lung lobe torsion in dogs and cats.