[Normal and pathological twin images of the human body].

The author demonstrates examples of symmetrical images in human pathology. He introduces the subject with arguments of the philosophical and cultural areas. He defines asymmetry and dissymmetry. The symmetrical images are linked to different planes (natural, artificial and mixed). With numerous symmetrical pathological images he demonstrates new teleonomical hypotheses: interchangeable, enantiomorphous, turned, rotated images. The concept of symmetry, asymmetry and dissymmetry leads to the concept of symmetrical thinking in clinical imaging.