Question:

Complications of pelvicalyceal diverticula include all of the following except:
1. Abscess formation.
2. Compression of surrounding structures.
3. Malignant transformation.
4. Pain.
5. Stone formation.





Answer:

The correct answer for the question "Complications of pelvicalyceal diverticula include all of the following except:" is:

3. Malignant transformation.



Explanation
1. Infection and abscess formation can occur. [Complications include secondary infection.]

2. If large, a diverticulum may compress surrounding structures. [Complications include ...  if large, compression on surrounding structures.]

3. Not known to undergo malignant transformation, but a calyceal diverticulum should be distinguished from a renal tumour, which it may mimic. [If calcifications are present then a complex cyst or even a renal tumour should be considered.]

4. Pain can occur, particularly if infected or large. [Complications include secondary infection, pain secondary to stone formation or, if large, compression on surrounding structures.]

5. Stone formation is a common recognized complication. [small or asymptomatic and may be found incidentally on radiological investigations. Complications include secondary infection, pain secondary to stone formation or, if large, compression on surrounding structures.]



From the manuscript:
Calyceal Diverticulum - a Mimic of Different Pathologies on Multiple Imaging Modalities
Radiology Case. 2012 Sep; 6(9):10-17


This article belongs to the GU section.




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From the manuscript

Calyceal Diverticulum - a Mimic of Different Pathologies on Multiple Imaging Modalities

Free full text article: Calyceal Diverticulum - a Mimic of Different Pathologies on Multiple Imaging Modalities

Abstract
Calyceal diverticula are outpouchings of a renal calyx. Often found incidentally on radiological imaging, they are generally benign and usually asymptomatic, although complications include infection and stone formation. More importantly, calyceal diverticula may mimic other potentially more serious pathology on imaging, such as renal tumour or abscess on ultrasound or computed tomography and even rib metastasis on bone scintigraphy. We present a case of a patient with a calyceal diverticulum found incidentally on imaging, in which the diverticulum is demonstrated on ultrasound, computed tomography, intravenous urogram and bone scintigraphy, and discuss the potential differential diagnoses that need to be excluded in this condition.






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