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Granulomatous mediastinitis due to rhizopus species.

Phycomycosis is seen most frequently in association with states of immunologic disturbance or hormonal imbalance. Several characteristic sites of infection with Phycomycetes are recognized, but mediastinal involvement has not been previously reported. A case of mediastinal granuloma due to Rhizopus species is described, and comparisons are made with other infections of similar histologic appearance.