Background
Occurrence of primary pulmonary neoplasms in pediatric patients are uncommon. Inflammatory myo-fibroblastic tumor (IMT) is a rare neoplasm, which has a moderate risk of malignancy appearing mainly in children and young adults (1, 2). Its nature is in majority of cases benign and rarely can metastases however could commonly relapse (3). This tumor is consist of different inflammatory cells, which its diversity is from primarily myo-fibroblastic cells to plasma cells in pathologic exam (4). IMT is defined as “a lesion composed of a proliferation of myo-fibroblastic spindle and stellate cells with abundant eosinophilic cytoplasm mixed with infiltrative plasma, inflammatory cells, lymphocytes and eosinophils” in world health organization (WHO) (5). IMT is known by numerous terms, including plasma cell granulomas, inflammatory pseudo-tumor, fibrous histiocytoma and pseudo-lymphoma (6), and may occur in a wide range of anatomical locations such as the lungs, omentum, bladder, spleen, breast, pancreas, liver, colon, spermatic cord, prostate, peripheral nerves, soft tissue, and orbit. About one-third of these tumors are found in the respiratory tract (6). We here report a case of IMT of the lung.