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Gross lesions of Mycobacterium microti tuberculosis in a field vole. (a) Skin scab in dorsal midline, between shoulder blades (arrow). (b) After partial skinning of the animal in (a), the inflammatory process underlying the external skin lesion is obvious as an area of hyperemia in the adipose tissue cushion between the shoulder blades (arrow). A further granulomatous lesion is present in the adipose tissue in the neck midline (arrowhead).
