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Recent advances in pediatric bladder malignancies.

Roberto Iglesias Lopes1, Marcos Figueiredo Mello1, Armando J Lorenzo2

  • 1Pediatric Urology Unit, Division of Urology, Hospital das Clínicas, University of São Paulo Medical School, São Paulo, 05402-000, Brazil.

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Summary
This summary is machine-generated.

Pediatric bladder tumors, including rhabdomyosarcoma (RMS) and papillary urothelial neoplasms of low malignant potential (PUNLMPs), require specific imaging and staging. Treatment often involves pre-operative chemotherapy for RMS and transurethral resection for PUNLMPs.

Keywords:
BLADDER MALIGNANCIESPEDIATRIC

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Area of Science:

  • Pediatric Oncology
  • Urologic Pathology
  • Medical Imaging

Background:

  • Urothelial pediatric neoplasms are rare, with Papillary Urothelial Neoplasms of Low Malignant Potential (PUNLMPs) and Rhabdomyosarcoma (RMS) being the most frequent bladder malignancies in children.
  • These tumors present with hematuria or lower urinary tract symptoms, or are found incidentally.
  • Bladder tumors originate from epithelial or non-epithelial layers, with RMS being the most common malignant bladder tumor in children under 10.

Purpose of the Study:

  • To summarize the current understanding of pediatric bladder neoplasms, focusing on common types, presentation, diagnosis, staging, and treatment.
  • To highlight the distinct management strategies for Rhabdomyosarcoma and Papillary Urothelial Neoplasms of Low Malignant Potential.
  • To provide an overview of diagnostic imaging and prognostic factors in pediatric bladder cancers.

Main Methods:

  • Review of existing literature on pediatric urothelial neoplasms and bladder malignancies.
  • Analysis of clinical presentation, histopathology, diagnostic imaging modalities (CT, MRI, PET), and staging systems.
  • Summary of current therapeutic approaches, including chemotherapy, surgery, and radiation therapy.

Main Results:

  • Rhabdomyosarcoma (RMS) is the predominant malignant bladder tumor in young children, with embryonal histology being most common (>90%).
  • Papillary Urothelial Neoplasms of Low Malignant Potential (PUNLMPs) are typically small, non-invasive, and treated with transurethral resection, though recurrence rates are significant (35%).
  • Pre-treatment imaging utilizes CT or MRI, with CT chest and bone scintigraphy for metastasis screening; staging and risk stratification are based on multiple factors.

Conclusions:

  • Effective management of pediatric bladder tumors requires accurate diagnosis, staging, and risk stratification.
  • Pre-operative chemotherapy is the standard first-line treatment for bladder/prostate RMS, followed by surgery or radiation.
  • PUNLMPs generally have a favorable prognosis with localized treatment, but surveillance for recurrence is necessary.