Abstract
A 45 year-old female developed a coin lesion in the right upper lobe of the lung discovered by chest X-ray film. The nodular lesion was histologically compatible with “sclerosing hemangioma of the lung” described by Liebow and Hubbell. Light and electron microscopy of the nodule revealed papillary and solid proliferation of epithelial cells. These cells showed morphological characteristics of the granular pneumonocytes at different developmental stages, suggesting the hamartomatous nature. This was an interesting case in that inflammatory episodes-that had taken place prior to growth of the nodule in the patient appeared to trigger abnormal proliferation of pneumonocytes.
