When a parked car is found with a crushed roof under a fallen construction beam, most people do not need a long explanation to know something went badly wrong. The event speaks for itself. That is the idea behind res ipsa loquitur, a rule that lets a court infer negligence from the nature of an accident when the injury ordinarily would not happen without carelessness, and the instrumentality that caused it was under the defendant's control.

In a medical malpractice case, this can matter fast. A surgical sponge left inside a patient, an operation on the wrong body part, or a serious injury to an area untouched by the procedure may allow a claim to move forward even when the patient cannot identify the exact mistake. It does not automatically win the case, but it can help establish negligence without direct proof of the precise act that caused harm.

For New York claims, timing can decide everything. If the provider is a municipal hospital such as NYC Health + Hospitals/Kings County or Woodhull, a Notice of Claim usually must be filed within 90 days. Missing that deadline can shut the case down before the evidence is fully developed. In delayed-diagnosis cases, New York also recognizes loss of chance, which may support recovery when negligent care reduced the chance of a better outcome, even if the exact mechanism is disputed.