Abstract: An ergonomic inflatable decubitus positioning support for medical use has a central opening, shaped for at least abdominal reception of a patient in ventral decubitus, and an inflatable load-bearing peripheral structure surrounding the central opening. This inflatable load-bearing peripheral structure extends according to a mainly rectangular inflatable shape with two lateral portions and two transversal portions, shaped in such a way that one of the two transversal portions, the so-called upper transversal portion, has at least locally, when the load-bearing peripheral structure is inflated, an inflated cross-section of smaller dimensions than those of the inflated cross-sections of the two lateral portions for an upper thoracic reception of the patient.