Small Animal Respiratory Pathology - Page 3 Small Animal Respiratory Pathology Diagnostic Aspects of Pneumonia Page 3 D. Mycotic pneumonia in Dogs 1. Gross and radiographic lung lesions are commonly mistaken for adenocarcinomas in young dogs because of their widely disseminated distribution and firm, exspansile characteristics. Chronic multifocal granulomatous pneumonia due to Blastomyces dermatitidis.
Lesions are firm, nodular, and expansile.
Similar gross lesions can by induced by Mycobacteria and by other fungi such as Coccidioides immitis. Cross section through lung with Blastomyces induced granulomas. Low power photomicrograph of granulomatous inflammatory focus near pleural surface. Medium-power photomicrograph of granulomatous exudate including epithelioid macrophages and multinucleated giant cells. Photomicrograph of pyogranulomatous exudate with spherule in center of multinucleated giant cell.