Primary Mesenteric Well-Differentiated Inflammatory Liposarcoma With Mucosal Extension: A Lesion With High Risk for...

Area of Science:

• Oncology
• Gastroenterology
• Pathology

Background:

• Well-differentiated liposarcomas (WDLS) are common retroperitoneal tumors.
• Primary WDLS of the small bowel mesentery is exceptionally rare, with few documented cases.
• These mesenteric tumors pose diagnostic challenges due to their rarity and potential for subtle presentation.

Observation:

• A case of primary mesenteric WDLS with unusual mucosal extension is presented.
• The lesion exhibited features that could lead to misdiagnosis, particularly if initially sampled via endoscopic mucosal biopsy.
• Histopathological examination revealed inflammatory changes and extension into the lamina propria.

Findings:

• Histopathologic review is crucial for differentiating WDLS from other mesenteric masses.
• Immunohistochemical studies aid in characterizing the tumor and excluding mimics.
• Fluorescent in situ hybridization (FISH) for MDM2 amplification is a key diagnostic marker for liposarcoma.

Implications:

• Early and accurate diagnosis of mesenteric WDLS is vital for appropriate patient management.
• Awareness of this rare entity and its potential for mucosal involvement is important for clinicians and pathologists.
• Utilizing a combination of diagnostic techniques ensures correct classification and prevents treatment delays.