A method and treatment device for inducing vasodilatation in a target vasculature of a patient. The method can include introducing an energy-supplying treatment instrument to a sinus cavity which provides access to a parasympathetic ganglion neurologically associated with the target vasculature. The method can also include applying non-electrical stimulant energy from the treatment instrument into the sinus cavity in a manner to stimulate the parasympathetic ganglion. The treatment device can be used to practice the method.
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