A 62-year-old woman presented with a 1-day history of chest pain on the left side that had radiated to her shoulder and back and was associated with dyspnea, diaphoresis, and lightheadedness. Read the full case details in the Clinical Problem-Solving article “From Where It Stems” by A. Shapira-Daniels et al., from @BUMedicine and @The_BMC: nej.md/3FqE7b4