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0025175 Honeycomb lung

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Pathologically, honeycombing is manifested as small air-containing cystic spaces that are lined by bronchiolar epithelium and have thickened walls of dense fibrous tissue. On high-resolution CT, honeycombing presents with a characteristic cystic appearance. The cystic spaces range from 3 mm to 1 cm in diameter, although they can be larger. The cystic spaces are characterized by well delineated walls 1 to 3 mm in thickness. The cysts are air-filled and appear lucent in comparison to normal lung parenchyma. Honeycombing is a manifestation of end-stage lung fibrosis.