An inflammatory myofibroblastic tumor (IMT) is a rare benign tumor with an unknown origin. Its clinical and radiological manifestations are variable and nonspecific, also half of them are asymptomatic while cough, hemoptysis, dyspnea are possible to see. Therefore the diagnosis is too hard to establish unless an exact evaluation by an expert pathologist on a biopsy from surgical resection. The standard treatment for diagnostic and therapeutic reasons is a complete resection whereas incomplete resection increases the risk of recurrence. Here we report a 10-year old boy with prolonged cough and collapse-consolidation in his chest x-ray who referred to our pediatric center in the northeast of Iran. Keywords: Inflammatory myofibroblastic tumor, cough, collapse, pediatric
