European Radiology

, Volume 30, Issue 2, pp 971–975 | Cite as

Large nearly spherical ablation zones are achieved with simultaneous multi-antenna microwave ablation applied to treat liver tumours

  • Roberto Luigi CazzatoEmail author
  • Pierre De Marini
  • Loïc Leclerc
  • Danoob Dalili
  • Guillaume Koch
  • Pramod Rao
  • Pierre Auloge
  • Julien Garnon
  • Afshin Gangi
Letter to the Editor



To investigate the shape and the volume of ablation zones obtained with microwave ablation (MWA) performed with multiple antennas in liver tumours.

Materials and methods

Tumour volume, number of antennas, size (long diameter (Dl), along the antenna axis; short diameter (Ds), perpendicular to the antenna axis; vertical diameter (Dv), vertical to both Dl and Ds) and shape (roundness index (RI); 1 corresponds to a sphere) of the ablation zone, ablation volume, and complications were evaluated.


Mean Dl, Ds, and Dv were 4.7 ± 1.4 cm, 3.9 ± 1.4 cm, and 3.8 ± 1.0 cm, respectively. Mean RIs (Ds/Dl, Dv/Dl, and Dv/Ds) were 0.83 ± 0.13, 0.83 ± 0.17, and 1.02 ± 0.23, respectively, without any difference between the mean RI obtained with the double (0.84 ± 0.01) and that with the triple-antenna (0.93 ± 0.13) approach (p = 0.25). Mean ablation volume was 41 ± 32 cm3 (vs. mean tumour volume 13 ± 10 cm3; range 1–40; p < 0.001). No complications were noted.


Simultaneous multi-antenna MWA of liver tumours results in large nearly spherical ablation zones.

Key Points

Simultaneous multi-antenna microwave ablation of liver tumours results in nearly spherical ablation zones.

The multi-antenna approach generates oversized ablation volumes compared with the target tumour volume.

The multi-antenna approach is safe.


Liver Neoplasms Microwaves 



Long diameter


Short diameter


Vertical diameter


Microwave ablation


Local tumour control


Roundness index


Funding information

The authors state that this work has not received any funding.

Compliance with ethical standards


The scientific guarantor of this publication is Afshin Gangi.

Conflict of interest

The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article.

Statistics and biometry

No complex statistical methods were necessary for this paper.

Informed consent

Written informed consent was waived by the Institutional Review Board.

Ethical approval

Institutional Review Board approval was obtained.


• retrospective

• observational

• performed at one institution


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Copyright information

© European Society of Radiology 2019

Authors and Affiliations

  1. 1.Service d’Imagerie InterventionnelleHôpitaux Universitaires de StrasbourgStrasbourgFrance
  2. 2.Department of Diagnostic and Interventional RadiologyGuy’s and St. Thomas’ Hospitals NHS Foundation TrustLondonUK
  3. 3.Section of Musculoskeletal Radiology, Russell H. Morgan Department of Radiology and Radiological ScienceJohns Hopkins University School of MedicineBaltimoreUSA

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