The aim of the study was the evaluation of endogenous lipid pneumonia-
type changes developing in the vicinity of primary tumors of the lungs
. The postoperative material collected from 56 patients operated for n
on-small cell lung cancer was examined. The coexistence of endogenous
lipid pneumonia-type changes with squamous cell carcinoma and large ce
ll carcinoma of the lung was most common. Patients with these histopat
hological types of carcinoma had lower percentage of metastases to the
lymph nodes. Endogenous lipid pneumonia was found to accompany most f
requently the tumors 3 less than or equal to 6 cm in diameter and it w
as slightly more common in the vicinity of peripheral tumors.