A mycetoma is a mass of fungal mycelia located in a pre-existing pulmonary cavity. The mycetoma is a saprophyte and can cause local affects, usually hemoptysis. However, it does not cause systemic effects. The mycetoma is seen on radiographs as a rounded mass within a cavity. The mass changes position when the patient changes position because it is free in the cavity. Most are due to an aspergillus organism.
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