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A 35-Year-Old Woman With Progressive Dyspnea and Cough. CASE PRESENTATION: A 35-year-old woman with no known medical history presented to the ED with complaints of progressive dyspnea for several months. The patient also reported episodic cough with yellow to green sputum production. She denied fever, chills, weight loss, or hemoptysis. She also denied any history of previous lung diseases in her family. She denied any history of tobacco or recreational drug use or any exposures. She was originally from El Salvador and immigrated to the United States approximately 3 years earlier. She was evaluated in El Salvador at age 15 for "lung issues" but had never received a formal diagnosis.