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Well-Differentiated Liposarcoma With Hibernoma-Like Morphology
Magnus Hallin1, Nina Schneider1, Khin Thway2
1Royal Marsden Hospital, London, UK.
International Journal of Surgical Pathology
|June 9, 2016
Summary
Well-differentiated liposarcoma (WDL) can present with hibernoma-like features, mimicking benign brown fat tumors. Recognizing this rare WDL variant is crucial for accurate diagnosis and patient management.
Area of Science:
- Oncology
- Pathology
- Surgical Pathology
Background:
- Well-differentiated liposarcoma (WDL) is a malignant soft tissue tumor with diverse histological appearances.
- WDL can dedifferentiate into higher-grade tumors with metastatic potential.
- Hibernomas are benign brown fat tumors that can occur in the retroperitoneum.
Observation:
- A case of retroperitoneal WDL exhibited extensive hibernoma-like morphology.
- The tumor displayed sheets of multivacuolated adipocytes and focal areas with atypical spindle cells.
- Immunohistochemistry and genetic analysis confirmed WDL, including MDM2 amplification.
Findings:
- Hibernoma-like morphology is a recognized, albeit rare, feature within the spectrum of WDL.
- Immunohistochemical markers (CDK4, p16) and MDM2 gene amplification are consistent with WDL even in hibernoma-like areas.
- The presence of atypical spindle cells and foci of dedifferentiation confirmed the liposarcoma diagnosis.
Implications:
- Accurate identification of WDL with hibernoma-like features is essential for appropriate treatment and prognosis.
- Pathologists must consider WDL in the differential diagnosis of retroperitoneal tumors with hibernoma-like morphology.
- Distinguishing this WDL variant from true hibernomas is critical to avoid under-treatment.
