While endobronchial lesions that present with symptoms of obstruction may be reflective of primary bronchogenic malignancy, there have been a number of reports of bronchial lesions other than primary bronchogenic carcinoma simulating primary endobronchial epithelial malignancy clinically. Twenty-five cases of symptomatic endobronchial disease were encountered with pathological assessment demonstrating an endobronchial process other than carcinoma, representing metastatic disease (breast, colon, renal, head and neck origin), fungal infection, Hodgkin's lymphoma, primary bronchogenic melanoma, lipoma, broncholith and inflammatory pseudopolyp. The present report underscores the potential pathogenetic heterogeneity encountered in lesions presenting with signs and symptoms of endobronchial obstruction, emphasizing the critical role of biopsy for establishing a definitive diagnosis.Key Words: Bronchus; Mimics of primary bronchogenic carcinoma; Tumour Simulation de cancer endobronchique primitif : étude clinique de 25 cas S'il est vrai que certaines lésions endobronchiques, qui se manifestent par des symptômes d'obstruction, peuvent être révélatrices d'un cancer bronchopulmonaire primitif, d'autres lésions bronchiques, différentes du cancer broncho-pulmonaire primitif, simulent, sur le plan clinique, une tumeur maligne primitive de l'épithélium endobronchique. À preuve : une étude de vingt-cinq cas de lésions endobronchiques symptomatiques dont l'examen pathologique faisait état de processus morbides évolutifs, différents du carcinome; parmi les affections en cause figuraient les métastases (cancer du sein, du côlon, du rein, de la tête et du cou), les infections fongiques, la maladie de Hodgkin, le mélanome bronchopulmonaire primitif, le lipome, la broncholithiase et les pseudopolypes inflammatoires. Le présent rapport fait ressortir l'hétérogénéité des affections possibles se manifestant par des signes et des symptômes d'obstruction endobronchique et, par le fait même, le rôle crucial de la biopsie pour poser un diagnostic formel. E ndobronchial lesions comprise a heterogeneous group of pathological entities. Regardless of their pathogenetic basis, similar obstructive signs and symptoms develop; hemoptysis, cough and/or dyspnea are characteristic. The most frequent pathogenetic basis is primary bronchogenic malignancy including bronchogenic small cell carcinoma, well-differentiated neuroendocrine carcinomas, bronchogenic squamous cell carcinoma and nonsmall cell carcinoma (1). However, previous reports (2-6) have reported other etiologies, including infection, lymphoma, endobronchial hamartomatous lesions, other rare forms of primary endobronchial neoplasia and finally, metastatic disease. The purpose of the present study was to explore the spectrum of endobronchial lesions in which pathological examination established a diagnosis other than primary pulmonary carcinoma. Three of these patients have been previously reported (3,5). The clinical features, including bronchoscopic assessment and pathological findings, are...