Clinical, therapeutical observations and experience in 3 cases of pulmonary inflammatory pseudotumors (PIP) are presented. A retrospective analysis is made of cases with pulmonary "mass" suspected as malignant tumor, resected in a general surgery department between 1988 and 1995, and finally diagnosed as inflammatory pseudotumor. Three of the 10 cases originally diagnosed as malignant lung tumor were inflammatory pseudotumor (30%). Pulmonary inflammatory pseudotumors, may be a pitfall diagnosing a lung mass and implicate legal problems. Surgical resection leads to the final diagnosis in doubtful cases. A wide resection has a diagnostic aim and may preserve healthy parenchyma. Clinicians, pathologists and surgeons should accurately inform patients with doubtful diagnosis of pulmonary malignancy. Any decision should be kept altogether either choosing the simple observation or the timely surgical diagnostic and therapeutical approach.