Scarf pin-related hijab syndrome: Unusual type of foreign body aspiration (2017)

And an interesting asymmetry:

> The left main bronchus is the most common site of pin impaction.

> Although inhaled foreign bodies commonly lodge in the right bronchial tree, scarf pins more often settle in the left tree. Numerous authors have attributed this finding to the Bernoulli phenomenon, which states that coughing, laughing, or speaking creates stronger negative pressure in the narrow left bronchus than in the wide right bronchus.