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Image 13
Prone HRCT near lung bases of a smoker with Langerhans cell histiocytosis

Prone HRCT near the lung bases in a 36-year-old smoker with dyspnea
shows a combination of reticular opacities and small lung cysts with
easily definable walls (arrows). Although this appearance resembles
honeycombing in UIP and IPF, the cystic spaces predominate in the
central lung regions and the posterior and subpleural lung is
relatively spared. This would be very atypical for honeycombing in
UIP/IPF.
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