A drilling mask (100) for implanting a transpedicular screw (50) on a spine section (200) comprises a guide body (10) with a distal surface (12) and a proximal surface (14), opposite to the distal surface (12) and facing towards the spine section (200). The guide body (10) comprises a reference element (21) obtained on the proximal surface (14) and arranged to contact the spinous process (220), a guide channel (25) that extends starting from the distal surface (12), which is arranged to work as drilling guide for drilling the pedicle (250) and implanting the transpedicular screw (50), and a plurality, of support elements (22, 23) made on the proximal surface (14), associated with the reference element (21), arranged to contact side parts of the spine section (220). The guide body (10) comprises at least one reference portion (10a), which represents the central portion of the mask, equipped with the reference element (21), and configured to be put at the spinous process (220) and at least one lateral guide portion (10b, 10c), cooperating with the reference portion (10a), which comprises the guide channel (25) for drilling the pedicle (250) and the support elements (22, 23) laterally with respect to the spinous process (220).Linvention concerne un masque (100) de perçage destiné à implanter une vis transpédiculaire (50) sur une section (200) de colonne vertébrale, comportant un corps (10) de guidage présentant une surface distale (12) et une surface proximale (14) située à lopposé de la surface distale (12) et orientée vers la section (200) de colonne vertébrale. Le corps (10) de guidage comporte un élément (21) de référence obtenu sur la surface proximale (14) et placé de manière à toucher lapophyse épineuse (220), un conduit (25) de guidage qui sétend en partant de la surface distale (12), agencé de manière à faire fonction de guide de perçage pour percer le pédicule (250) et implanter la vis transpédiculaire (50), ainsi quune pluralité déléments (22, 23) de soutien
