Which statement about Sinus Lipomatosis is true?

Which statement about Sinus Lipomatosis is true?

• A. It is fat accumulation in the renal sinus
• B. It has no pathological significance
• C. It presents with fever
• D. It is a small cyst

Answer: (A)

Sinus lipomatosis is fat accumulation in the renal sinus, a benign variant where adipose tissue expands the sinus space. This is the defining feature you should recognize. On imaging, you can see fat within the sinus region, which can sometimes mimic dilation of the collecting system, but the actual collecting system itself isn’t pathologically dilated. It’s not related to fever or infection, and it’s not a cystic lesion. Because the hallmark is the fatty infiltration of the renal sinus, the statement that describes this anatomical finding is the correct one.

Sinus lipomatosis is fat accumulation in the renal sinus, a benign variant where adipose tissue expands the sinus space. This is the defining feature you should recognize. On imaging, you can see fat within the sinus region, which can sometimes mimic dilation of the collecting system, but the actual collecting system itself isn’t pathologically dilated. It’s not related to fever or infection, and it’s not a cystic lesion. Because the hallmark is the fatty infiltration of the renal sinus, the statement that describes this anatomical finding is the correct one.