Kidney inflammatory myofibroblastic tumor masquerading as metastatic malignancy: A case report and literature review

Figure 1 Pre-operative computed tomography images. A: Computed tomography (CT) image showing a 4.1 cm × 3.2 cm mass in the middle pole of the left kidney. B: Contrast-enhanced CT image showing slight enhancement.

Figure 2 Microscopic findings and immunohistochemical analysis results. A: Photomicrograph showing abundant spindle cells and collagen with infiltrating lymphocytes and plasma cells (hematoxylin-eosin staining; magnification, ×200); B-D: Immunohistochemically, the tumor cells were positive for (B) vimentin, (C) Ki-67, and (D) CK (magnification, ×200).