Board-type device for supporting a body part of a patient

A multi-part carrying structure apparatus for supporting a body part of a patient, includes a main carrying structure having a narrow support surface and a first additional part having a support surface. The first additional part is detachably connected to the main carrying structure. When the first additional part is connected to the main carrying structure, a first combined support surface including the narrow support surface of the main carrying structure and the support surface of the first additional part is wider than the narrow support surface of the main carrying structure. The main part and the first additional part are produced from a material having a high degree of transparency for X-rays.