Actinomyces viscosus in a branchial cyst.
D000190:Actinomyces / Q000302:isolation & purification*; D000196:Actinomycosis / Q000382:microbiology / Q000473:pathology / Q000601:surgery; D000328:Adult; D001935:Branchioma / Q000382:microbiology* / Q000473:pathology / Q000601:surgery; D006801:Humans; D008297:Male