Primary Ewing Sarcoma Within an Autosomal Dominant Polycystic Kidney: A Case Report

Area of Science:

• Oncology
• Nephrology
• Pathology

Background:

• Ewing sarcoma typically affects bone and soft tissues in younger individuals.
• Primary renal Ewing sarcoma is exceptionally rare.
• Autosomal dominant polycystic kidney disease (ADPKD) may increase kidney cancer risk.

Observation:

• A 44-year-old male with end-stage renal disease due to ADPKD presented with flank pain.
• Imaging identified a large, heterogeneous mass in his polycystic left kidney.
• Pathology confirmed primary Ewing sarcoma within the polycystic kidney.

Findings:

• The patient underwent nephrectomy and received adjuvant chemotherapy (vincristine, dactinomycin, cyclophosphamide).
• Despite treatment, the patient experienced disease relapse 13 months post-diagnosis and died 3 months later.
• Primary renal Ewing sarcoma is rare, often diagnosed late due to nonspecific symptoms, and carries a poor prognosis.

Implications:

• This case highlights a rare but aggressive malignancy in a specific patient population.
• Early detection and novel therapeutic strategies are crucial for improving outcomes in primary renal Ewing sarcoma.
• Further research is needed to understand the potential link between ADPKD and renal sarcomas.