Changes

1. '''Infiltrate or consolidation ''' - Opacification of airspaces within the lung parenchyma. Consolidation or infiltrate can be dense or patchy and might have irregular, ill-defined, or hazy borders.

2. '''Any cavitary lesion ''' - Lucency (darkened area) within the lung parenchyma, with or without irregular margins that might be surrounded by an area of airspace consolidation or infiltrates, or by nodular or fibrotic (reticular) densities, or both. The walls surrounding the lucent area can be thick or thin. Calcification can exist around a cavity.

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]]<ref>{{cite journal|last=Rossi|first=S. E.|author2=Franquet, T. |author3=Volpacchio, M. |author4=Gimenez, A. |author5= Aguilar, G. |title=Tree-in-Bud Pattern at Thin-Section CT of the Lungs: Radiologic-Pathologic Overview|journal=Radiographics|date=1 May 2005|volume=25|issue=3|pages=789–801|doi=10.1148/rg.253045115|url=http://radiographics.rsna.org/content/25/3/789.full|accessdate=28 May 2012}}</ref>). The surrounding haziness can be either subtle or readily apparent and suggests coexisting airspace consolidation.

<br>4. '''Pleural effusion ''' - Presence of a significant amount of fluid within the pleural space. This finding must be distinguished from blunting of the costophrenic angle, which may or may not represent a small amount of fluid within the pleural space (except in children when even minor blunting must be considered a finding that can suggest active TB).

5. '''Hilar or mediastinal lymphadenopathy ''' ([[bihilar lymphadenopathy]]) - Enlargement of lymph nodes in one or both hila or within the mediastinum, with or without associated atelectasis or consolidation.

6. '''Linear, interstitial disease ''' (in children only) - Prominence of linear, interstitial (septal) markings.

7. Other '''Miliary nodules ''' - Any other finding suggestive of active TB, such as miliary TB. Miliary findings are nodules of millet size (1 to 2 millimeters) distributed throughout the parenchyma.

1. '''Discrete fibrotic scar or linear opacity—Discrete opacity''' — Discrete linear or reticular densities within the lung. The edges of these densities should be distinct and there should be no suggestion of airspace opacification or haziness between or surrounding these densities. Calcification can be present within the lesion and then the lesion is called a “fibrocalcific” scar.

2. '''Discrete nodule(s) without calcification—One calcification''' - One or more nodular densities with distinct borders and without any surrounding airspace opacification. Nodules are generally round or have rounded edges. These features allow them to be distinguished from infiltrates or airspace opacities. To be included here, these nodules must be noncalcified. Nodules that are calcified are included in the category “OTHER X-ray findings, No follow-up needed”.

3. '''Discrete fibrotic scar with volume loss or retraction—Discrete retraction''' — Discrete linear densities with reduction in the space occupied by the upper lobe. Associated signs include upward deviation of the fissure or hilum on the corresponding side with asymmetry of the volumes of the two thoracic cavities.

4. '''Discrete nodule(s) with volume loss or retraction—One retraction''' — One or more nodular densities with distinct borders and no surrounding airspace opacification with reduction in the space occupied by the upper lobe. Nodules are generally round or have rounded edges.

5. Other—Any other finding suggestive of prior TB, such as upper '''Upper lobe bronchiectasis. Bronchiectasis is bronchial ''' - Bronchial dilation with bronchial wall thickening.