title: The mural nodule in cavitary opportunistic pulmonary aspergillosis.
abstract: A common radiographic feature of opportunistic pulmonary aspergillosis is a rounded, cavitary lesion with a nodule projecting into it. This appearance has been given a variety of names, including "air crescent," "meniscus," "target," "bull's-eye," and "peninsula." These signs merely represent different radiographic projections of the cavitary lesion and mural nodule. Similar lesions may also be encountered in other conditions.
mesh_terms: D000328:Adult; D001228:Aspergillosis / Q000000981:diagnostic imaging* / Q000209:etiology; D006801:Humans; D007165:Immunosuppression Therapy / Q000009:adverse effects; D015470:Leukemia, Myeloid, Acute / Q000150:complications; D008172:Lung Diseases, Fungal / Q000000981:diagnostic imaging* / Q000209:etiology; D008297:Male; D008875:Middle Aged; D008961:Models, Structural; D011859:Radiography