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Published on: April 11, 2018
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A retroperitoneal primary undifferentiated pleomorphic sarcoma.
Makishi Nakamura1, Kazuaki Yamanaka1, Taigo Kato1
1Department of Urology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.
Urology Case Reports
|January 29, 2024
Summary
A retroperitoneal undifferentiated pleomorphic sarcoma was diagnosed in a 52-year-old male. Complete surgical removal resulted in no recurrence after 1.5 years, indicating successful treatment for this rare retroperitoneal tumor.
Area of Science:
- Oncology
- Surgical Pathology
Background:
- Retroperitoneal tumors can present with vague symptoms, necessitating advanced imaging for diagnosis.
- Distinguishing between primary adrenal carcinoma and other retroperitoneal masses is clinically important.
Observation:
- A 52-year-old male presented with right back and hypochondrium pain.
- Abdominal CT revealed a 49mm right upper perirenal space tumor.
- MRI and PET-CT suggested adrenal origin with potential liver and diaphragmatic invasion.
Findings:
- Laparotomy successfully removed the perirenal tumor.
- Histopathology confirmed a primary retroperitoneal undifferentiated pleomorphic sarcoma.
- The patient achieved 1.5 years of disease-free survival post-surgery.
Implications:
- Complete surgical resection is a viable curative option for retroperitoneal pleomorphic sarcoma.
- This case highlights the importance of thorough histopathological evaluation for retroperitoneal masses.
- Long-term surveillance may be warranted for patients with retroperitoneal sarcomas.

