Merck Manual

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Ruptured retropharyngeal Streptococcus equi abscess, horse
Ruptured retropharyngeal Streptococcus equi abscess, horse

Endoscopic image of a ruptured retropharyngeal S equi abscess through the floor of the medial compartment of the right guttural pouch.

Courtesy of Dr. Bonnie R. Rush.