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©2013 UpToDate ® Print Email Cryptogenic organizing pneumonia: High power view Photomicrograph of specimen from open lung biopsy in a patient with cryptogenic organizing pneumonia. A polypoid mass of granulation tissue is filling the lumen of an alveolar duct (Masson body). Courtesy of Talmadge E King Jr, MD. Normal lung High power photomicrograph shows alveoli containing capillaries within a narrow interstitium. The alveoli are lined with thin, elongated type I pneumoctes (red arrow) and smaller numbers of cuboidal type II pneumocytes (green arrow). Courtesy of Steven E Weinberger, MD.