Merck Manual

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Caseous lymphadenitis lesions, internal form, mesenteric lymph nodes, sheep
Caseous lymphadenitis lesions, internal form, mesenteric lymph nodes, sheep

Caseous lymphadenitis abscesses in multiple mesenteric lymph nodes in an adult ewe. The cut surface of one lymph node displays the characteristic thick "onion-like" layers of purulent material within these lesions.

Courtesy of Dr. Kevin Washburn.