Laparoscopic Management of an Inflammatory Pseudotumor Mimicking a Locally Advanced Renal Carcinoma: A Diagnostic Pitfall

Abstract

Inflammatory pseudotumors of the kidney are an infrequent entity. More frequently described in the lung, the genitourinary tract location is rare. Commonly described in the bladder, the kidney damage remains exceptional. Herein, we report the case of 60 years old man with a history of flank pain, initially diagnosed with a locally advanced left renal carcinoma invading the left colon. Then, after performing a laparoscopic radical nephrectomy, the histopathological diagnosis of inflammatory pseudotumor of the left kidney has been made.

Inflammatory Myofibroblastic Tumor of the Right Kidney Mimicking a Locally Advanced Renal Carcinoma: A Case Report

“…IMT is a rare benign condition and is thought to be an inflammatory pseudotumor rather than an actual tumoral process ( 6 , 7 ). IMT is defined histologically by the growing number of typical spindle-shaped cells and inflammatory infiltration of plasma cells, eosinophils, and lymphocytes ( 5 , 6 ). According to the World Health Organization classification, IMT is an intermediate biological potential tumor with a proclivity for local recurrence and a low risk of distant metastasis ( 6 ).…”

“…IMT is more common in children than adults without gender preference; nonetheless, extrapulmonary forms are more common in adult females, making our patient’s age and gender less prevalent ( 9 ). Although IMT has been seen in other organs, it is extremely rare in the kidney, with only a few published cases ( 1 , 5 , 7 , 9 ).…”

“…There is no current agreement regarding managing and monitoring renal IMT. There have been no prospective studies on this subject due to the rare incidence of renal involvement ( 5 ).…”

“…There are few cases of IMT originating from the kidney in the literature (5). In addition, an appropriate diagnosis around the masses but no signs of organ invasion (Figure 1).…”

“…There are few cases of IMT originating from the kidney in the literature ( 5 ). In addition, an appropriate diagnosis of renal ITM allows for avoiding an unnecessary surgical intervention such as radical nephrectomy.…”