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Image 14
Prone HRCT through upper lobes typical of a smoker with Langerhans cell histiocytosis

Prone HRCT through the upper lobes shows the cysts (arrows) to be
larger, irregular in shape, and occupying a greater cross-sectional
area of lung. This upper lobe predominance would also be distinctly
unusual in UIP/IPF. This appearance of irregular lung cysts with an
upper lobe predominance is typical of Langerhans cell histiocytosis
in a cigarette smoker.
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