The term minimally invasive has always been somewhat uncomfortable for me, perhaps because of the implication that all other operations must be maximally invasive. Yet the term minimally invasive has been used long enough to become accepted as referring to any procedure, often stereotactically guided, that requires a small opening, usually with the patient under local anesthesia, and is often (but not always) associated with minimal morbidity. To this definition the authors emphasize the economic benefits of this type of surgery both from the standpoint of decreased lost work time for the patients and the more obvious decrease in length of hospital stay and services required.
Minimally Invasive Therapy of the Brain. Arch Neurol. 1998;55(1):124. doi: