Merck Manual

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Duck viral enteritis, petechial and ecchymotic hemorrhages and diphtheritic membrane, esophagus
Duck viral enteritis, petechial and ecchymotic hemorrhages and diphtheritic membrane, esophagus

In acute cases, the mucosa of the esophagus may show ecchymotic hemorrhages and ulcers (left). The esophago-proventricular sphincter may be seen as a hemorrhagic ring. In more chronic cases, the lumen gets lined with a yellowish-white membrane (right) or, in some cases, there may be sloughing of the entire mucosa.

Courtesy of Dr. Alejandro Banda.