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Image 20
Chronic hypersensitivity pneumonitis
Chronic hypersensitivity pneumonitis
Contrast-enhanced thin-slice CT in a patient with chronic hypersensitivity pneumonitis and dyspnea. Reticulation, traction bronchiectasis, and honeycombing (red arrows) are visible, diffusely involving the central as well as peripheral lung regions. Note that the upper lobes (shown here) are extensively involved. This distribution (ie, central as well as peripheral lung, upper lobes) is often seen with chronic hypersensitivity pneumonitis but would be unusual with IPF. Note that the main pulmonary artery (PA) is dilated as a result of associated pulmonary hypertension.

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