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From the archives of the AFIP. Genitourinary rhabdomyosarcoma in children: radiologic-pathologic correlation
G A Agrons1, B J Wagner, G J Lonergan
1Department of Radiologic Pathology, Armed Forces Institute of Pathology, Washington, DC, USA.
Insights
Childhood genitourinary rhabdomyosarcoma, a common pediatric tumor, presents varied symptoms based on location. Advances in multidisciplinary therapy significantly improve outcomes for this rare cancer.
Area of Science:
- Pediatric Oncology
- Genitourinary Pathology
- Cancer Imaging
Background:
- Rhabdomyosarcoma is the most common pediatric tumor affecting the lower genitourinary tract.
- Embryonal subtype is most frequent, involving bladder, prostate, testes, vagina, and uterus.
- Clinical presentation and prognosis vary significantly by anatomical site.
Purpose of the Study:
- To review the natural history, diagnostic imaging features, and treatment of pediatric genitourinary rhabdomyosarcoma.
- To highlight the impact of modern multidisciplinary therapeutic regimens on patient outcomes.
Main Methods:
- Review of clinical presentation, radiological findings, and histopathology of genitourinary rhabdomyosarcoma.
- Analysis of treatment strategies including chemotherapy, radiation therapy, and surgery.
- Discussion of the role of diagnostic imaging in monitoring treatment response.
Main Results:
- Symptoms range from urinary retention and hematuria (bladder/prostate) to painless scrotal swelling (paratesticular) or vaginal prolapse.
- Radiologic studies show nonspecific features; botryoid variant can mimic other tumors.
- Multidisciplinary therapeutic regimens have dramatically improved outcomes.
Conclusions:
- Genitourinary rhabdomyosarcoma requires a site-specific approach for diagnosis and management.
- Integrated treatment combining chemotherapy, radiation, and surgery is crucial for improving survival.
- Diagnostic imaging is vital for assessing tumor burden and monitoring therapeutic efficacy.
Abstract:
Rhabdomyosarcoma is the most common tumor of the lower genitourinary tract in children in the first 2 decades of life. Most cases of genitourinary rhabdomyosarcoma are of the embryonal histologic subtype and include tumors of the bladder, prostate, testes and paratesticular sites, penis, perineum, vagina, and uterus. The natural history, pattern of metastatic spread, treatment, and prognosis of childhood rhabdomyosarcoma vary with the anatomic site of the lesion. In children with rhabdomyosarcoma of the bladder or prostate, presenting signs and symptoms include urinary or fecal retention, dysuria, urinary tract infection, and hematuria. Paratesticular rhabdomyosarcoma produces painless scrotal swelling, which may be ignored until the tumor has reached a large size. Vaginal tumors may manifest as a prolapsing mass in the introitus. Radiologic studies of children with genitourinary rhabdomyosarcoma reflect the nonspecific gross features of the tumor, which may be ill defined with infiltrative margins or well circumscribed by a pseudocapsule of compressed tissue. The botryoid variant of embryonal rhabdomyosarcoma results when submucosal tumor produces a polypoid mass resembling a cluster of grapes within a hollow structure. Botryoid morphology is characteristic, but not specific, for rhabdomyosarcoma within the vagina or urinary bladder, since yolk sac tumor and "tumoral" cystitis may have a similar appearance. Invasion of adjacent structures by the primary tumor may make the precise anatomic origin of genitourinary rhabdomyosarcoma difficult to determine on cross-sectional images. Recent refinements in multidisciplinary therapeutic regimens combining chemotherapy, radiation therapy, and surgery have dramatically improved outcome for children with genitourinary rhabdomyosarcoma. Diagnostic imaging plays an important role in monitoring response to therapy.