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Triangulation method for percutaneous needle guidance: the angled approach to upper abdominal masses
AJR. American Journal of Roentgenology
|October 1, 1981
Summary
This study introduces a geometric technique for percutaneous biopsy of difficult-to-reach masses. The method accurately guided needles, improving diagnostic success and avoiding complications like pneumothorax.
Area of Science:
- Interventional Radiology
- Medical Imaging
- Surgical Techniques
Background:
- Percutaneous biopsy of retroperitoneal, adrenal, renal, and hepatic masses can be challenging due to their posterior location.
- Previous methods sometimes led to complications such as pneumothorax.
Purpose of the Study:
- To describe and evaluate a novel geometric technique for percutaneous biopsy of posteriorly located masses.
- To improve accuracy, reduce procedure time, and minimize complications.
Main Methods:
- Utilized computed tomography or sonography for guidance.
- Employed a technique based on the Pythagorean theorem and tangent ratios for precise needle angling.
- Performed biopsies in the prone position to achieve an extrapleural, extraperitoneal route.
Main Results:
- The technique was applied in 17 procedures across 16 patients.
- Needles were accurately positioned in all cases.
- A positive diagnosis was achieved in 13 patients, with a 92% diagnostic accuracy (13/14), excluding intrahepatic hemangiomas.
Conclusions:
- The geometric technique offers a precise and safe approach for percutaneous biopsy of challenging masses.
- This method effectively reduces procedure time and avoids previously encountered complications like pneumothorax.