Multilocular cystic nephroma in a 15-month-old infant: Successful surgical management and 10-year follow-up.
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INTRODUCTION: Multilocular cystic nephroma (MLCN) is a rare benign renal tumor of uncertain etiology that affects primarily infants and young children. Clinically and radiologically, it can closely resemble malignant renal tumors such as cystic partially differentiated nephroblastoma (CPDN) and cystic Wilms tumors, which makes a precise preoperative diagnosis particularly challenging. CASE PRESENTATION: We report the case of a 15-month-old male infant who presented nonspecific symptoms, including diarrhea, reduced appetite, and progressive abdominal distension. Physical examination revealed a failure to thrive and a well-defined and firm abdominal mass. Imaging studies demonstrated a multilocular cystic lesion in the left kidney without evidence of calcification, lymphadenopathy, or metastasis. Due to diagnostic ambiguity and the suspicion of malignancy, an open radical nephroureterectomy was performed. Gross pathology revealed a multiloculated mass filled with clear fluid, and histological evaluation confirmed the diagnosis of MLCN. CLINICAL DISCUSSION: This case underscores the difficulty in distinguishing MLCN from malignant cystic renal tumors based solely on imaging. Although MLCN is benign, the potential for misdiagnosis requires surgical intervention. Complete excision remains both diagnostic and curative. Long-term outcomes are excellent, with a low risk of recurrence or malignant transformation. In our case, the child recovered well after the operation and showed no evidence of recurrence after ten years of follow-up, highlighting the favorable prognosis with appropriate treatment. CONCLUSION: MLCN should be considered in the differential diagnosis of pediatric cystic renal masses. Despite its benign behavior, surgical resection is often required due to diagnostic uncertainty. This case illustrates the importance of a multidisciplinary approach in the evaluation of renal tumors in children and reinforces the need for long-term follow-up.