Honeycombimg of lung in C.X.R. is seen in – a) R.A.b) T.B.c) Sclerodermad) Carcinomae) Interstitial lung disease
Causes of honeycomb lung

Common causes :- Histiocytosis - X, Scleroderma, RA, Fibrosing alveolitis, Sarcoidosis, ILD, Sarcoidosis, Pneumoconiosis (Silicosis, coal miner's lung, asbestosis, berylliosis), Tuberculosis.
Uncommon causes :-Amyloidosis, chronic interstitial pneumonia, Gaucher's disease, neurofibromatosis, tuberous sclerosis.
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