renal milk of calcium cysts
Kalkmichzyste
der rechten Niere in der Computertomographie axial und sagittal im Knochenfenster. Das kalkdichte Material sammelt sich entsprechend der Schwerkraft als Sediment in der Zyste.
Teenager with
an incidental renal cyst containing calcium on US. Coronal (above left), sagittal (above right) and axial (below left) CT without contrast of the abdomen show a round low density lesion in the inferior pole of the right kidney that has a cresenteric calcification next to the wall of its inferior-posterior aspect. Axial CT with contrast of the abdomen (below right) more clearly shows the calcification next to the wall of the inferior-posterior aspect of the low density lesion in the kidney.The diagnosis was renal milk of calcium cyst.
Calyceal
diverticulum – a differential diagnosis of a renal cystic lesion. Axial unenhanced CT scan. Numerous well-defined and low density structures are seen containing calcific densities in both kidneys.
Renal milk of calcium cysts refer to the appearance of a calcium precipitate found either within a calyceal diverticulum, that has lost communication with the collecting system, or within a simple renal cyst.
Clinical presentation
Renal milk of calcium cysts are typically asymptomatic.
Radiographic features
Plain radiograph
- on erect or decubitus films, renal milk of calcium cysts have a characteristic crescentic opacity with a sharp upper border
- will change shape to a more oval-shaped opacity on supine projections
Ultrasound
- dependent echogenic material within a hypoechoic cyst that demonstrates reverberation artifact
- posterior shadowing is present when large volumes of milk of calcium are present
- more common in the upper pole of the kidneys
Treatment and prognosis
Considered an incidental benign finding that does not require further treatment unless symptomatic.
Differential diagnosis
On supine plain radiographs, a renal milk of calcium cyst may be mistaken for a renal calculus. Milk of calcium can also occur within the gallbladder.
Siehe auch:
Assoziationen und Differentialdiagnosen zu Kalkmilchzysten der Nieren: 