A system for use in tumor ablation. The tumor ablation system includes a microwave antenna which has a channel along the length thereof. There are two ports proximate the proximal end of the microwave antenna. The first port is an energy port configured to connect the antenna to an energy source. The second port is a fluid port configured to connect the channel to a fluid delivery mechanism. The system also includes an inflatable balloon configured to be attached to a distal end of the antenna. The channel permits fluid access from the fluid port to an interior of the balloon for inflation thereof.