ABSTRACT
Introduction: Biphasic Pulmonary blastoma (BPB) is classified as one of the rare primary lung malignancies. It is composed of a mixture of epithelial and mesenchymal tissues resembling embryonic lung tissue. BPB is considered to be distinct from other lung tumors based on pathological features, clinical course and prognosis. Presentation of Case: The authors report an atypical case of BPB in a 27 -year-old man presented with complaints of dyspnea and left-sided chest pain for the previous four months. A chest radiograph showed the presence of an opaque left hemithorax, and the mediastinum was pushed toward the left. Computed tomography (CT) of the chest revealed a mixed solid and cystic process with variable contrast enhancement measuring 15,4 x 13,7 cm occupying the totality of the left hemithorax, pleural effusion, and a collapsed left lung, with contralateral mediastinal shift. A transthoracic needle pleural biopsy yielded a diagnosis of BPB.A general examination shows a peritoneal effusion. One month after diagnosis, the tumor grew rapidly, and therefore he was treated only by palliative care. He died from respiratory failure one month later. Although BPB is rare, this entity is increasingly described. Conclusion: The purpose of presenting this case report is to raise awareness among clinicians to consider this clinical entity as a differential diagnosis when a pleural mass is identified. Histological examination is the most reliable and conclusive method of diagnosing BPB and differentiating it from other primary or metastatic lung malignancies.