Retroperitoneal lipoma arising from the urinary bladder
Shingo Ukita1, Masafumi Koshiyama, Megumi Ohnaka
1Department of Obstetrics and Gynecology, Otsu Red-Cross, Otsu, Shiga, Japan;
Rare Tumors
|December 9, 2010
Summary
Retroperitoneal benign lipomas are rare tumors, with this case mimicking an ovarian teratoma. Early diagnosis via MRI enabled successful surgical removal, but vigilant follow-up is crucial due to recurrence and malignant transformation risks.
Area of Science:
- Oncology
- Radiology
- Pathology
Background:
- Retroperitoneal tumors are predominantly malignant, with benign lipomas accounting for only 2.9% of primary cases.
- Distinguishing benign lipomas from malignant neoplasms preoperatively is critical for appropriate patient management.
Observation:
- A rare case of a retroperitoneal benign lipoma was observed, initially presenting as a potential ovarian mature cystic teratoma.
- Magnetic resonance imaging (MRI) facilitated accurate preoperative diagnosis of the retroperitoneal lipoma.
- The lipoma was identified as originating from the urinary bladder.
Findings:
- Surgical resection (total tumorectomy) was successfully performed.
- Histological examination confirmed the tumor comprised typical adipose cells without atypia.
- The retroperitoneal lipoma demonstrated characteristics of benign adipose tissue.
Implications:
- Accurate preoperative diagnosis using advanced imaging like MRI is vital for managing rare retroperitoneal masses.
- Despite benign histology, retroperitoneal lipomas warrant close monitoring due to potential for recurrence and malignant transformation.
- This case highlights the importance of considering benign lipomas in the differential diagnosis of retroperitoneal tumors, even when they mimic other pathologies.
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