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Ninety-one Patients of gram-negative infections of lung were encountered in 423 bronchoscopies. This report presents an analysis of 29 patients of pseudomonas infections encountered in this series. Most of the patients have one or more predisposing factors and 22 had associated lung disease in the form of carcinoma, fibrosis, emphysema and bronchiectasis. Radiologically, the disease presented with diffuse lower lobe bronchopneumonia in 12 and lobar infiltrates were seen in five. Mixed lobular and lobar infiltrates were seen in 12. Lower lobes were frequently involved. Radiological regression was seen in only seven and radiological progression or death occurred in 12; in the remaining 10 disease was stationary.