Usual interstitial pneumonia pattern on histopathology showing alternation of fibrosing areas and a) normal/subnormal parenchymal areas and b) fibroblastic.

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Usual interstitial pneumonia pattern on histopathology showing alternation of fibrosing areas and a) normal/subnormal parenchymal areas and b) fibroblastic foci (M. Usual interstitial pneumonia pattern on histopathology showing alternation of fibrosing areas and a) normal/subnormal parenchymal areas and b) fibroblastic foci (M. Kambouchner, Dept of Pathology, Hôpital Avicenne, Bobigny, France; personal communication). D. Valeyre Eur Respir Rev 2011;20:108-113 ©2011 by European Respiratory Society