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Angiomyolipoma arising in the colon
C Maesawa1, G Tamura, H Sawada
1Department of Pathology, Iwate Medical University School of Medicine, Japan.
The American Journal of Gastroenterology
|September 1, 1996
Summary
Extrarenal angiomyolipomas are rare tumors. This is the first reported case of a surgically resected angiomyolipoma in the descending colon, presenting unique diagnostic features.
Area of Science:
- Gastroenterology
- Oncology
- Surgical Pathology
Background:
- Extrarenal angiomyolipomas (EAMs) are uncommon mesenchymal tumors.
- Angiomyolipomas are typically found in the kidney but can occur in extrarenal sites.
- Tuberous sclerosis complex is associated with renal angiomyolipomas, but EAMs are often sporadic.
Observation:
- A 50-year-old male presented with symptoms of colon obstruction.
- A tumor was identified in the descending colon requiring surgical resection (partial colectomy).
- Histological examination revealed mature fat, blood vessels, and smooth muscle components, consistent with angiomyolipoma.
Findings:
- The colonic tumor was diagnosed as an angiomyolipoma based on its triphasic histological composition.
- Immunohistochemical analysis showed smooth muscle cells positive for vimentin, alpha-smooth muscle actin, and desmin.
- Tumor cells lacked HMB-45 expression, differentiating it from typical renal angiomyolipomas.
Implications:
- This case represents the first documented instance of a surgically treated angiomyolipoma of the descending colon.
- The findings contribute to the understanding of the diverse locations and histological variations of angiomyolipomas.
- Distinguishing EAMs from other soft tissue tumors is crucial for appropriate clinical management and treatment strategies.