Inflammatory myofibroblastic tumor of the perirenal soft tissue misdiagnosed as renal cell carcinoma.
Inflammatory myofibroblastic tumor (IMT) of the kidney or perirenal soft tissue is a rare benign lesion that can mimic a malignant renal neoplasm. We describe the case of a 51-year-old woman that had originally been misdiagnosed as renal cell carcinoma in another hospital. Histologic re-evaluation of the tumor in our institution showed that it was in fact an IMT. Awareness of this entity is required for rendering the accurate diagnosis. An association with inflammatory infiltrate, frequent erythrocyte extravasations, edematous or myxoid stroma, absence of atypical mitosis, and the results of a detailed immunohistochemical panel might help in the differential diagnosis. Our patient is recurrence-free in the 18th month of post-operative follow-up.
Bektas
Sibel
S
Department of Pathology, Hacettepe University Hospital, Ankara, Turkey.
Okulu
Emrah
E
Kayigil
Onder
O
Ertoy Baydar
Dilek
D
D002292:Carcinoma, Renal Cell / Q000175:diagnosis* / Q000473:pathology; D003937:Diagnosis, Differential; D003951:Diagnostic Errors; D005260:Female; D005347:Fibroblasts / Q000473:pathology*; D006801:Humans; D007249:Inflammation / Q000473:pathology*; D007680:Kidney Neoplasms / Q000175:diagnosis* / Q000473:pathology; D008875:Middle Aged; D032342:Muscle Cells / Q000473:pathology*; D012017:Referral and Consultation; D012983:Soft Tissue Neoplasms / Q000175:diagnosis* / Q000473:pathology; D014057:Tomography, X-Ray Computed; D014463:Ultrasonography