Figure 1.

(A) Computed tomography (CT) of the chest revealed mass-like opacity (arrow); (B, C, and D)¹⁸F-fluorodeoxyglucose positron emission tomography–CT scan revealed high metabolic activity in the pulmonary lesion, the supraclavicular region, and the portocaval region (arrows); (E) T2-weighted magnetic resonance imaging (MRI) revealed a peripherally enhanced mass-like lesion involving T12 vertebra (arrows); (F) pathologic examination of pulmonary lesion revealed proliferation of myofibroblastic spindle cells with lymphoplasmacytic infiltration, a finding consistent with inflammatory myofibroblastic tumor (IMT) (hematoxylin and eosin stains). After systemic corticosteroid therapy (G, H, and I), the CT scan revealed a shrinkage of IMT lesions (G and H, arrows), and T2-weighted MRI revealed a decreased enhancement of the T12 vertebra lesion (I, arrows).