NEJM This Week — June 19, 2025

Featuring articles on mismatch repair–deficient tumors, generalized myasthenia gravis, HER2-mutant non–small-cell lung cancer, a Corynebacterium diphtheriae outbreak, and hereditary and sporadic papillary kidney cancer; a review article on unruptured intracranial aneurysms; a case report of a man with respiratory failure and shock after kidney transplantation; and Perspectives on medical AI and clinician surveillance, on pathobiology, and on unrest.