A case of bilateral agraphia produced by a left parietal glioma is described in a 49 year-old right-handed woman. Hypothesis of a pure agraphia, etiology and non-frontal localisation of tumor are discussed. This agraphia is associated to a right astereognosia; neither functional nor behavioral relationships are found between these two defects, and it appears that their are probably associated according to the parietal locus of lesions.