Brynn Peterson, 24, of Glenside, will run the Philadelphia Marathon on Sunday, May 4, six months after learning she had nearly 30 blood clots in her lungs, PhillyVoice reported.

A sixth-grade teacher at St. Helena-Incarnation Catholic School in Philadelphia and a former student-athlete at La Salle University, she started to have sharp pain near her ribs last year while training for another marathon. Doctors told her that if she hadn’t sought out medical attention, she would have had a heart attack in the near future.

An excerpt:

Oct. 27, Peterson drove herself to Temple Health’s Chestnut Hill Hospital near her home in Glenside. An EKG and blood work showed that her heart was in severe distress. Scans showed blood clots filled her lungs in addition to one in her leg.

A genetic mutation makes Peterson predisposed to blood clots. Being on blood thinner for nearly six months has resolved all of the clots in her lungs. But the lung that had partially died due to restricted blood flow is still healing.

She will be running Broad Street with about 75% lung capacity, PhillyVoice said.

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