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Pathomorphological changes after radiofrequency ablation in the liver.

Hans-Udo Kasper¹, Christopher Bangard, Axel Gossmann

¹Institute of Pathology, Clemenshospital Münster, Germany.

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|April 21, 2010

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Radiofrequency ablation (RFA) causes distinct macroscopic and histomorphological changes in liver lesions. Understanding these changes, including necrosis, fibrous capsules, and vascular alterations, is crucial for interpreting biopsies and resection specimens.

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Area of Science:

Hepatobiliary Surgery
Interventional Radiology
Oncology

Background:

Radiofrequency ablation (RFA) is a common treatment for liver cancer.
Limited data exists on the macroscopic and histomorphological changes following RFA treatment.

Purpose of the Study:

To investigate the macroscopic and histomorphological changes in liver lesions after RFA.
To characterize the healing process and cellular responses in RFA-induced lesions.

Main Methods:

Domestic pigs underwent RFA with a 3 cm ablation diameter.
Macroscopic and histological analyses were performed on liver samples at 24 hours, 2 weeks, and 4 weeks post-RFA.
Human liver resection specimens from RFA-treated patients were also examined.

Main Results:

Acute RFA changes included a necrosis zone and a resorption zone with granulocytes and hyperemia.
Subchronic and chronic changes revealed a thermofixation zone, fibrous capsule, and liver reaction zone.
Vascular damage (endothelial destruction, thrombosis) was observed in small vessels, while larger vessels remained intact.
Human samples showed reduced tumor-infiltrating lymphocytes and increased histiocytes.

Conclusions:

RFA induces characteristic histomorphological changes in liver lesions.
Recognizing thermofixation and resorption processes aids in interpreting biopsies and surgical specimens.
Understanding these changes is vital for accurate assessment of RFA treatment efficacy and follow-up.