Centrilobular lung nodules
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Centrilobular lung nodules refer to ana HRCT chest imaging descriptor for small 5-10 mm lung nodules which are anatomically located centrally within secondary pulmonary lobules. The term is applied on the basis of location of the nodule and not its morphology, that is they may be well-defined or poorly-defined ground glass in appearance. If extremely small they are termed centrilobular micronodules.
Pathology
Aetiology
Centrilobular nodules can be observed in a wide variety of lung pathology. They are usually seen with a bronchiolitis (i.e. with bronchiolar or peribronchiolar abnormalities). Specific conditions include:
- bronchiolitides
- infection with endobronchial spread
- airway spread of tuberculosis
- airway spread of non-tuberculous mycobacterial infection
- airway invasive aspergillosis 3
- bronchoalveolar carcinoma with airway spread
- subacute hypersensitivity pneumonitis 1
- respiratory bronchiolitis interstitial lung disease (RB-ILD) 5
- pulmonary vasculitides
When centrilobular nodules are interspersed with linear and branching densities, it is then termed a tree-in-bud pattern.
Radiographic features
CT
HRCT chest
On HRCT chest, centrilobular nodules are typically found around the small airways and spare the subpleural surfaces. They are typically at least 5-10 mm away from the pleural surfaces ref.
See also
-<p><strong>Centrilobular lung nodules </strong>refer to an <a href="/articles/high-resolution-ct-1">HRCT chest</a> imaging descriptor for small 5-10 mm <a title="Lung nodules" href="/articles/pulmonary-nodule-1">lung nodules</a> which are anatomically located centrally within <a href="/articles/secondary-pulmonary-lobule">secondary pulmonary lobules</a>. The term is applied on the basis of location of the nodule and not its morphology, that is they may be well-defined or poorly-defined <a title="Ground glass density nodule (GGN)" href="/articles/ground-glass-density-nodule-1">ground glass</a> in appearance. If extremely small they are termed <a href="/articles/centrilobular-micronodules">centrilobular micronodules</a>.</p><h4>Pathology</h4><h5>Aetiology</h5><p>Centrilobular nodules can be observed in a wide variety of lung pathology. They are usually seen with a <a href="/articles/bronchiolitis">bronchiolitis</a> (i.e. with bronchiolar or peribronchiolar abnormalities). Specific conditions include:</p><ul>- +<p><strong>Centrilobular lung nodules </strong>refer to a <a href="/articles/high-resolution-ct-1">HRCT chest</a> imaging descriptor for small 5-10 mm <a href="/articles/pulmonary-nodule-1">lung nodules</a> which are anatomically located centrally within <a href="/articles/secondary-pulmonary-lobule">secondary pulmonary lobules</a>. The term is applied on the basis of location of the nodule and not its morphology, that is they may be well-defined or poorly-defined <a href="/articles/ground-glass-density-nodule-1">ground glass</a> in appearance. If extremely small they are termed <a href="/articles/centrilobular-micronodules">centrilobular micronodules</a>.</p><h4>Pathology</h4><h5>Aetiology</h5><p>Centrilobular nodules can be observed in a wide variety of lung pathology. They are usually seen with a <a href="/articles/bronchiolitis">bronchiolitis</a> (i.e. with bronchiolar or peribronchiolar abnormalities). Specific conditions include:</p><ul>
-</ul><p>When centrilobular nodules are interspersed with linear and branching densities, it is then termed a <a href="/articles/tree-in-bud-sign-lung">tree-in-bud pattern</a>.</p><h4>Radiographic features</h4><h5>CT</h5><h6>HRCT chest</h6><p>On <a title="HRCT chest" href="/articles/hrct-chest-1">HRCT chest</a>, centrilobular nodules are typically found around the small airways and spare the subpleural surfaces. They are typically at least 5-10 mm away from the pleural surfaces <sup>ref</sup>.</p><ul><li><a href="/articles/small-pulmonary-nodules-hrct-chest-approach-1">small pulmonary nodules: HRCT chest approach </a></li></ul><h4>See also</h4><ul>- +</ul><p>When centrilobular nodules are interspersed with linear and branching densities, it is then termed a <a href="/articles/tree-in-bud-sign-lung">tree-in-bud pattern</a>.</p><h4>Radiographic features</h4><h5>CT</h5><h6>HRCT chest</h6><p>On <a href="/articles/hrct-chest-1">HRCT chest</a>, centrilobular nodules are typically found around the small airways and spare the subpleural surfaces. They are typically at least 5-10 mm away from the pleural surfaces <sup>ref</sup>.</p><ul><li><a href="/articles/small-pulmonary-nodules-hrct-chest-approach-1">small pulmonary nodules: HRCT chest approach </a></li></ul><h4>See also</h4><ul>