Coin ..In Esophagus or in trachea

The classic teaching tells :

Esophageal coins appear in the coronal plane, as shown above.
Tracheal coins appear in the sagittal plane because of the cartilaginous tracheal rings.

Busting the myth :
A case series of 8 pediatric patients were documented with coins positioned in a sagittal plane were actually in the esophagus! This data was collected over 15 years.

Age range 3-17 years old
Location of coin: 7/8 at level of aortic notch and 1/8 at distal esophagus

The classic teaching likely still holds true most of the time (sagittal coin = tracheal foreign body), but don't rush to immediate judgment. Take a look at the lateral view, and see where the coin is located with respect to the trachea and airway. It may be more posterior, in which case, it's in the esophagus.

Reference

Schlesinger AE, Crowe JE. Sagittal orientation of ingested coins in the esophagus in children. AJR Am J Roentgenol. 2011 Mar;196(3):670-2. Pubmed

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