Prosch H, Strasser G, Oschatz E, Schober E, Schneider B, Mostbeck G. Guidelines for Management of Small Pulmonary Nodules Detected on CT Scans: A Statement from the Fleischner Society. Fleischner Society pulmonary nodule recommendations.British Thoracic Society guidelines for pulmonary nodules.In this article, we follow the cutoff recommended by the Fleischner Society 2017 position statement, which considers lesions up to 3 mm micronodules 10. Some authors consider lesions measuring <3 mm as micronodules 9.
#NODUS SYNONYMS TRIAL#
In the National Lung Screening Trial (NLST) all nodules with <4 mm maximum diameter were recorded as micronodules 8.
The term micronodule has been defined variably by different position statements. Nodules and masses are most often seen in metastatic disease to the lung.Īlways be aware of artifacts, especially on radiographs, where buttons or nipple shadows can often be mistaken for a true pulmonary nodule 7. Solitary pulmonary nodules and hyperdense pulmonary nodules are discussed further elsewhere.Ī micronodular or miliary pattern is predominately seen in granulomatous processes, hematogenous pulmonary metastases, and pneumoconioses. The differential diagnosis for a nodule can be refined by its size, location, and density. (For further discussion, see the article on nodular opacification.)
They are quite separate from airspace nodules that often have an irregular margin and are usually ~8 mm in diameter. They are generally homogeneous (without air bronchograms or alveolograms) and are well-defined since their margins are sharp and they are surrounded by normally aerated lung parenchyma. Pulmonary nodules can be classified according to size, morphology and/or distribution.
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