2-year-old, Male, Intact, Shih Tzu

History: Respiratory Distress


•There is a mild volume of left-sided pleural effusion and scant right-sided pleural effusion.

•Decreased volume of both subsegments of the left cranial lung lobe with mild dilation of the lobar bronchi with tapering immediately adjacent to the carina.

•A vesicular emphysema pattern is distributed largely symmetrically the left cranial lung lobe.

Radiographic Diagnosis:

There are findings consistent with a left cranial lung lobar torsion with mild concurrent pleural effusion. An underlying cause for a lung lobe torsion is not definitively identified in this examination.


Park KM, Grimes JA, Wallace ML, et al. Lung lobe torsion in dogs: 52 cases (2005–2017). Veterinary Surgery. 2018 Nov 1;47:1002–1008.

Photo by Adam Grabek on Unsplash

One comment

  1. Radiographs of the thorax in three views, right and left lateral and ventrodorsal view. The patient was slightly rotated on the left lateral and VD views. Images are of diagnostic quality.
    There is a big amount of fluid opacity in the pleural space on the left side. On the right side, a pleural fissure is visible between the cranial and middle lung lobe. The alveolar pattern is visible in the left cranial lung field with additional tiny gas bubbles in the same area. On the lateral views, the alveolar pattern is located in the dorsal half of the lung field. The heart silhouette is not well delineated because of the fluid opacity in pleural space. The visible lung vessels are unremarkable. The trachea is normal. The chest wall and diaphragm are normal.
    The findings are consistent with torsion of the left cranial lung lobe. The fluid in pleural space could be either a consequence or cause of lung lobe torsion.

    To confirm the tentative diagnosis of lung lobe torsion a chest CT is recommended. If it is confirmed the surgical procedure should follow.

Leave a Reply