Bronchioloalveolar carcinoma in progressive systemic sclerosis.

Bronchioloalveolar carcinoma(BAC) is the most common histological type of lung cancer arising in an area of scar tissue, and it is frequently superimposed in the fibrotic lung of progressive systemic sclerosis(PSS). The so called scar cancer is believed to be caused by the transformation of hyperplastic epithelium to metaplasia and finally to neoplasia under the conditions of chronic inflammation with some unknown etiological factors. The authors report a case of BAC in a woman with the typical picture of PSS.