An catheter and method for mapping the pulmonary vein and other tubular regions of or near the heart are described. The catheter comprises an elongated catheter body having a proximal end, a distal end and at least one lumen extending longitudinally therethrough. The catheter includes a mapping assembly mounted at the distal end of the catheter body which comprises a stem and at least two spines moveable between a collapsed position and an expanded position. In the collapsed position, each spine has a distal end attached to the stem and a free proximal end positioned generally against the stem. In the expanded position, the free proximal end of each spine extends outwardly from the stem. Each spine carries at least one electrode.
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