Document Detail

Time-related changes of radiofrequency ablation lesion in the normal rabbit liver: findings of magnetic resonance imaging and histopathology.
MedLine Citation:
PMID:  12874519     Owner:  NLM     Status:  MEDLINE    
RATIONALE AND OBJECTIVES: To study time-related magnetic resonance imaging (MRI) and histopathological findings after radiofrequency ablation (RFA) in the normal liver. METHODS: Under ultrasound guidance, RFA was performed in 22 rabbits with a 15-gauge expandable probe inserted into the liver. The RF power was applied at 10 W initially with a 5-W increment every minute until RF power "roll-off" occurred. The rabbits subjected to postmortem MRI at 3 days (n = 6), 2 weeks (n = 6), 4 weeks (n = 6), and 12 weeks (n = 4) after RFA. Spin-echo (SE) T(1)-weighted image (WI) (TR/TE=500/12) and fast SE T2-WI (TR/TE= 3500/99) were obtained. The liver specimens were excised and processed for conventional histologic study. The MRI and pathologic findings were compared qualitatively and quantitatively. RESULTS: The lesion diameters measured with MRI and liver specimen were well correlated (P < 0.05). The coagulated regions presented 2 of 4 laminar patterns on T1/T2-WI 3 days after RFA, and 2 of 3 laminar patterns on T1/T2-WI 2 to 4 weeks after RFA. 12 weeks after RFA, the signal intensity in coagulated regions increased on T1-WI with a 2-laminar pattern still visible on T2-WI, the same as that of 2 to 4 weeks. The observed pathologic changes (enlarged sinusoids, marginal fibrous tissue and hepatocyte degeneration) could be responsible for the MRI laminar patterns and signal intensity changes. CONCLUSION: The time-related pathologic changes of RFA lesions in rabbit livers can be reflected as laminar patterns on MR images. Understanding of the zone structure of the lesions is useful for the evaluation of follow-up MRI.
Masashi Tsuda; Hiroya Rikimaru; Kazuhiro Majima; Takayuki Yamada; Haruo Saito; Tadashi Ishibashi; Shoki Takahashi; Hideo Miyachi; Mareyuki Endoh; Shogo Yamada
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Investigative radiology     Volume:  38     ISSN:  0020-9996     ISO Abbreviation:  Invest Radiol     Publication Date:  2003 Aug 
Date Detail:
Created Date:  2003-07-22     Completed Date:  2004-03-04     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0045377     Medline TA:  Invest Radiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  525-31     Citation Subset:  IM    
Department of Diagnostic Radiology, Tohoku University Graduated School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, 980-8574, Japan.
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MeSH Terms
Catheter Ablation*
Liver / pathology*,  surgery
Magnetic Resonance Imaging*
Radio Waves*
Time Factors

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