The present invention relates to devices and methods delivering a plurality of thermal ablation probes to an organic target in a body, the probes being delivered in a configuration and orientation enabling efficient and thorough ablation of a large target of complex shape. Preferred embodiments include introducers having individual probe channels shaped to direct inserted probes to diverge upon exiting the introducer, probes designed and constructed to bend in selected manner when exiting the introducer, and apparatus for stabilizing an introducer with respect to a target during insertion of treatment probes from introducer to target.