metastatic

This term carries a heavy clinical weight, signaling a transition from a localized condition to a systemic one. It evokes a sense of invasive movement and biological aggression, where the disease is no longer contained but has migrated through the bloodstream or lymphatic system.

In a non-medical or metaphorical sense, it describes an idea, trend, or problem that spreads rapidly and uncontrollably across a system, mirroring the relentless expansion of a malignant growth. It suggests a process that is difficult to stop once the initial breach has occurred.