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Presented by Ralph Hruban, M.D. and prepared by Anil Parwani, M.D.,Ph.D
Case 6: This asymptomatic elderly man was found to have a 25cm retroperitoneal mass.
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1. Question
Week 138: Case 6
This asymptomatic elderly man was found to have a 25cm retroperitoneal mass./images/6203case6fig1.jpg
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/images/6203case6fig3.jpgCorrect
Answer: Lipoma
Histology: This large neoplasm was largely composed of mature fat.
Discussion: The histology of this mass is that of mature adipose tissue similar to lipoma in other sites. However, given its location in the retroperitoneum and the large size of the neoplasm (25cm), it is best managed clinically as a well-differentiated liposarcoma.
Incorrect
Answer: Lipoma
Histology: This large neoplasm was largely composed of mature fat.
Discussion: The histology of this mass is that of mature adipose tissue similar to lipoma in other sites. However, given its location in the retroperitoneum and the large size of the neoplasm (25cm), it is best managed clinically as a well-differentiated liposarcoma.
