Miraculous Cure

A term, the meaning of which depends on the user and the context, which, in general terms, can be defined as a highly unexpected return to a state of health from a grave medical condition
Oncology Because late—up to decades after a presumed cure—recurrence and relapse of cancer is not uncommon, oncologists are reticent about using the phrase miraculous cure
Paranormal A medically unexpected return to health attributed to a religious miracle
Vox populi In the working (non-oncologic, non-ecclesiastic) parlance, the phrase miraculous cure is loosely defined by the lay public as any unexpected return to health—e.g., awakening from a year-long coma, walking again after a cervical spine injury that left one paraplegic, etc.