Calyceal diverticulum

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[edit] Discussion of Calyceal diverticulum

  • AKA "Pyelocalyceal diverticulum"
  • Calyceal diverticulum is a relatively uncommon cyst-like lesion, often discovered incidentally during ultrasound examination of the kidneys.
  • Calyceal diverticulum is a urine-containing cavity within the renal parenchyma, communicating with the collecting system through a narrow channel.
  • Two types are identified:
    • One is related to a minor calyx and usually located in the upper pole
    • Other is connected with the pelvis or a major calyx in the central portion of the kidney.
  • The majority of calyceal diverticulum are small and asymptomatic, and do not require any treatment.
  • Calyceal diverticulua may rarely cause urinary tract infection, renal colic, pyuria, hematuria or hypertension.
  • Mobile calculi and milk of calcium are characteristic findings in calyceal diverticulum.

[edit] Imaging Findings for Calyceal diverticulum

[edit] US

  • Ultrasound examination suggests the diagnosis of calyceal diverticulum and it has a variable appearance.
  • The diverticulum may appear as a cyst-like lesion, indistinguishable from a simple cyst.
  • Recognition of mobile echogenic material within such a cyst-like structure is considered characteristic of milk of calcium. A cyst-like mass with milk of calcium is presumed to be a calyceal diverticulum.

[edit] CT

  • CT has an important role in the presence of a complicated cystic mass diagnosed by US without the characteristic features of calyceal diverticulum.
  • The demonstration of the layering of contrast medium on delayed images is pathognomonic of these lesions.
  • The patency of the diverticulum is demonstrated by the gradual opacification on delayed images.

[edit] Images

Patient #1

[edit] External Links

[edit] References