“…In a quarter of patients is fortuitous discovery on a routine chest X-ray may show an isolated parenchymal nodule or perihilar mass associated with any mediastinal lymphadenopathy, these images are better characterized on CT and IRM to specify the exact place of the tumor mass, degree of extension, the state of the underlying lung parenchyma and guide the percutaneous biopsy, but are usually unspecific. 1,3 The diagnosis is based on two elements, firstly a negative complete search of myeloma, secondly, on histological examination of the surgical specimen (the case of our patient), transparietal biopsy, more rarely on the cytology of bronchoalveolar lavage or trans-bronchial biopsies. 1 Histological study will objectify webs of tumor plasma cells morphologically variable from the mature form to the atypical immature form.…”