Large oak has vertical swollen areas (adult arm width, 7–15 ft long) on trunk. Several present. Tree dying?
Caused by rapid expansion/contraction of water in wood under fluctuating late winter/early spring temps. Defective wood doesn't contract well. Often on southwest side. Cracks heal in summer, reopen in winter → "frost ribs." Can admit decay fungi.
Generally don't kill tree. Monitor occasionally.
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