NEW YORK (WFAN/AP) — Phil Hughes’ “dead arm” is still a mystery, but the Yankees might finally be on track to finding an answer for the young right-hander.

Manager Joe Girardi said a battery of tests on Wednesday revealed that Hughes has a low-level risk of thoracic outlet syndrome, a circulatory problem.

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“I think anytime you talk about circulation problems, there’s some concern,” said Girardi. “This is different than (the aneurysm David Cone) had. These are different types of things, but there’s always a concern.”

The team will send him to St. Louis to see a specialist, Dr. William Thompson.

“I think you wait to see what the specialist says,” said Girardi, “to determine if he has it or doesn’t have it, and then you go from there.”

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The right-hander had two MRIs and a vascular test to check circulation Tuesday. On the disabled list since April 15 because of a “dead arm,” Hughes cut short a bullpen session Monday, saying his arm didn’t feel any livelier.

Hughes, 24, was 18-8 with a 4.19 ERA last year, earning his first All-Star selection. This season, he is 0-1 with a 13.94 ERA after three starts and has had trouble reaching 90 mph with his fastball.

Will the Yankees’ rotation be OK without Hughes? Sound off in the comments below…

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