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Blind percutaneous renal simple cyst ablation based on CT scan tract calculations     

 

Blind percutaneous renal simple cyst ablation based on CT scan tract calculations

 

A 16 cm right renal cyst(Bosniak I )  in a 90 year old man was percutaneously drained  with blind needle insertion on previously calculated tract based on axial  abdominal CT scan By Dr Aghamir , Salavati and Modarresi.

In axial ct :

1-      Cutaneous entery point selected at 12 rib tip. Distance from spinal process could also be calculated on Dicomm PACS and used as entery point

2-      A tangenital line drawn  on skin at entery point

3-      Put Needle insertion line toward the center of cyst and measure the depth from skin

4-       Point a line from spinous process until it collides with needle insertion line

5-      The resukting angle is the entery angle in axial plane

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to calculate sagittal plane entery angle :

                       
 
   
     
       
 
 
   
 
   
 
 

 

 

 

 

 

 

 

The β angle could be calculated from  sinβ = a/c .

The distance d which shows the entry point could be deduced from counting remaining axial cuts between the perpendicular line and entry point.

 Finally fluoroscopy was used to determine the relati

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