Pathology: A multitude of irregular cystic spaces in pulmonary tissue that are generally lined with bronchiolar epithelium and have markedly thickened walls comprised of dense fibrous tissue, with or without associated chronic inflammation
Plain Radiograph: A number of closely approximated ring shadows representing air spaces, 5-10mm in diameter with walls 2-3mm thick that resemble a true honeycomb: a finding whose occurrence implies "end-stage" lung. Often mistaken for bronchiectasis.
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