A case of bilateral tracheal bronchus: report of a rare association in multidetector computed tomography bronchoscopy.

Bilateral tracheal bronchus is a rare variation of the tracheobronchial tree. We present a 1-year 7-month-old male patient who presented with sepsis following endotracheal intubation. Upon review of multidetector computed tomography images, the patient was diagnosed with displaced bilateral tracheal bronchus. Imaging showed a right-sided anomalous bronchus arising 0.9 cm proximal to the carina. The left-sided anomalous bronchus arose 0.7 cm proximal to the carina, mimicking a tracheal trifurcation. When viewed together, the close proximity of both the right and left tracheal bronchi to the carina created a distinct tracheal quadrifurcation. This rare anatomic variation was additionally associated with an anorectal malformation (anal atresia). Unrecognized tracheal bronchus in patients undergoing endotracheal intubation can lead to serious complications. While bilateral tracheal bronchus is described in the literature, we are unaware of any case similar to this patient presentation. We present and analyze this unusual case of bilateral tracheal bronchus. The anatomy and clinical significance of this variation is then discussed.