Five patients with proved blastomycosis had a diffuse miliary nodular pattern seen on chest radiographs. These cases are presented to emphasize that blastomycosis may be the cause of a miliary pattern in an endemic area. Documentation requires recovery of the organism from body fluids or tissue since skin and serologic testing are unreliable indicators of active disease. With prompt diagnosis and appropriate treatment, the patient may recover from this form of endogenous disseminated reinfection that otherwise may be fatal, particularly in the immunocompromised host.
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