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A lung nodule or pulmonary nodule is a relatively small focal density in the lung. A solitary pulmonary nodule (SPN) or coin lesion, [1] is a mass in the lung smaller than three centimeters in diameter. A pulmonary micronodule has a diameter of less than three millimetres. [2] There may also be multiple nodules.
3. Nodule with poorly defined margins - Round density within the lung parenchyma, also called a tuberculoma. Nodules included in this category are those with margins that are indistinct or poorly defined (tree-in-bud sign [3]). The surrounding haziness can be either subtle or readily apparent and suggests coexisting airspace consolidation.
This finding is most commonly associated with hematogenous metastases, where malignant cells spread to the lungs via the bloodstream, forming discrete nodules that resemble cannonballs. [2] The term "cannonball" reflects the large, rounded appearance of these lesions, often evident on chest radiographs or CT scans.
A lung nodule is a discrete opacity in the lung which may be caused by: Neoplasm: benign or malignant; Granuloma: tuberculosis; Infection: round pneumonia; Vascular: infarct, varix, granulomatosis with polyangiitis, rheumatoid arthritis; There are a number of features that are helpful in suggesting the diagnosis: rate of growth
In radiology, the tree-in-bud sign is a finding on a CT scan that indicates some degree of airway obstruction. [1] The tree-in-bud sign is a nonspecific imaging finding that implies impaction within bronchioles, the smallest airway passages in the lung.
Category 0 refers to the absence of small opacity and category 3 represents the most profuse. The major category (first number) represents the profusion felt to best fit the subject x-ray, and the minor category (second number) represents either the profusion seriously considered as an alternative, or if none, the same profusion as the major ...
The presence of lung nodules on high resolution CT is a keystone in understanding the appropriate differential. Typically, the distribution of nodules is divided into perilymphatic, centrilobular and random categories. Furthermore, nodules can be ill-defined, implying they are in the alveoli, or well defined, suggesting an interstitial position ...
A similar study of 40 patients issued in the European Respiratory Journal resulted in an overall 62.5% diagnostic yield and concluded; "electromagnetic navigation bronchoscopy without additional fluoroscopic guidance is a safe and efficient technique for the diagnosis of peripheral pulmonary nodules. The overall diagnostic yield found in the ...