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A Pregnant Woman Presenting With Progressively Worsening Dyspnea and Pneumothorax. CASE PRESENTATION: A 29-year-old Ukrainian woman presented to the obstetric clinic at 28 weeks' gestation with pregnancy complicated by intrauterine growth restriction. She reported progressively worsening dyspnea during her pregnancy and was found to have significant hypoxia with an oxygen saturation of 84% on room air prompting admission for further evaluation. Oxygen saturation improved to 92% on 10 L of supplemental oxygen. On further questioning, she was found to have a history significant for pleurodesis as a treatment for recurrent pneumothoraces and nephrectomy for a benign renal mass several years prior while living in Ukraine.