Which findings on chest radiography are characteristic of parainfluenza virus (PIV) pneumonia?

Updated: Mar 24, 2021
  • Author: Zab Mosenifar, MD, FACP, FCCP; Chief Editor: John J Oppenheimer, MD  more...
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In PIV, the "steeple sign" (progressive subglottic narrowing), classic for croup in children, is rarely seen in adults. Instead, chest radiographs may reveal findings ranging from focal infection to diffuse interstitial infiltrates or diffuse mixed alveolar-interstitial infiltrates consistent with acute lung injury. CT scan findings of six HSCT recipients with PIV (type 3) diagnosed as the sole etiologic pathogen revealed multiple small nodules (diameter, < 5 mm) without cavitation in a peribronchial distribution. [5]

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