It was reported that a left pneumothorax occurred.The event was reported as part of an investigator initiated study (iis), cryoablation to improve response to pembrolizumab in metastatic bladder cancer.A cryoablation needle was selected for use in a cryoablation procedure to treat metastatic urothelial carcinoma.The cryoablation was performed on a left upper lobe nodule in the lung.The patient's final dose of their first cycle of pembrolizumab was on (b)(6) 2023.On (b)(6) 2023, the patient began reporting dyspnea on exertion.Their home spo2 was typically in the 90s, occasionally as high as 97%.The patient also reported increased fatigue and decreased appetite, as well as occasional mild lightheadedness.When a chest x-ray was performed, a small to moderate left pneumothorax was observed, which was likely delayed following the recent procedure.Thoracic was consulted, which advised the patient to go to the emergency department.In the emergency department, a pigtail catheter was placed to provide negative pressure to fully re-inflate the lung.The pigtail catheter was placed on (b)(6) 2023 on -20 suction.A repeat chest x-ray the next day, (b)(6) 2023, showed no pneumothorax.The patient was breathing comfortably on room air, and physical exam also showed the lungs were clear, abdomen was soft, and there was no peripheral edema.The next morning, on (b)(6) 2023, the catheter was placed on water seal and then placed to clamp position.A new trace pneumothorax was present on the (b)(6) 2023 chest x-ray.The treatment was repeated, which then resolved the pneumothorax.The patient was discharged, and the plan was for them to follow up with outpatient oncology.
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