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Delayed Tension Symptomatic Pneumoperitoneum After POEM Requiring Needle Decompression. INTRODUCTION: Per-oral endoscopic myotomy (POEM) is an effective modality for the management of achalasia. Tension pneumoperitoneum is a significant complication that causes hemodynamic instability, generally within the periprocedural period. METHODS: Here, we report 2 cases of delayed tension pneumoperitoneum that was recognized and treated several hours after uncomplicated POEM. RESULTS: These cases illustrate the importance of continued vigilance for this complication outside of the immediate periprocedural period as well as the utility of computed tomography-guided aspiration in managing it. DISCUSSION: When discharging patients after POEM, caregivers should be aware of this rare complication and alert patients to return for immediate care when it happens.