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Aspergilloma
An aspergilloma, also known as a mycetoma or fungus ball, is a clump of mold which exists in a body cavity such as a paranasal sinus or an organ such as the lung. By definition, it is caused by fungi of the genus ''Aspergillus'',.〔(【引用サイトリンク】work=Medical Dictionary )〕
==Etiology==
The most common organ affected by aspergilloma is the lung. Aspergilloma mainly affects people with underlying cavitary lung disease such as tuberculosis, sarcoidosis, bronchiectasis, cystic fibrosis and systemic immunodeficiency. ''Aspergillus fumigatus'', the most common causative species, is typically inhaled as small (2 to 3 micron) spores. The fungus settles in a cavity and is able to grow free from interference because critical elements of the immune system are unable to penetrate into the cavity. As the fungus multiplies, it forms a ball, which incorporates dead tissue from the surrounding lung, mucus, and other debris.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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