A few evenings ago in the Hall of the Neurological Clinic of Bologna University Dr. HENRI HEcAEN gave a lecture on the physiopathology of writing. As I was listening to his learned exposition, memories returned to me of times when my reaction to his work was not always the enjoyment of a quiet listener; namely, of the times when, ten years before, during the" seances du samedi" at the Neurosurgical Center of Saint' Anne Hospital in Paris, our meetings often consisted of disputes, in a sparkling tangle of alliances and hostilities, which would often result in clashes between TALAIRACH,AJURIAGUERRA, BREGEAT, M. , and Mme DELL,KLoTz (each one passionately pleading for his own speciality), with a brillant chorus of collaborators: CONSTANS, ABouLKER, DELIGNE, SADOUN, BANCAUD ...enlivening the scene. I re- member the discussions on clinical cases, the "lettres au directeur et aux medicins soignants" in which GUILLY was a master of diplomacy, the biting hints at the administrators, the smiles between allies or lovers. And in that casbah-like uproar of students, doctors, patients, attendants, technicians, and spectators, the voice of the "Grand Chef," preceded by a slam on the table, ringing out loudly: "Nom de Dieu! Voulez-vous vous taire et nous foutre la paix?" Monsieur David was always able to humanize any abstract problem. Saint' Anne! An arena where we dealt with the latest findings of neurology, psychiatry, stereotaxis, neurosurgery, neurophthalmo- logy, electroencephalography and neuroradiology. lowe my career to having met Erik Lindgren and Marcel David.

Since its presentation by G.N. Hounsfield at the second Congress of the European Association of Radiology in Amsterdam in June 1971, "Computerised Trans verse Axial Tomography" which became later on "Computerised Axial Tomography (CAT)" then simply "Computed Tomography (CT)" has developed extremely rapidly. Many papers have appeared in a short time, pointed out the substantial advantages of this new technique and precisely describing the characteristic images obtained. The number of devices is already considerable and their evolution tends towards the improvement of the quality of images and the shortening of exploration time. It is not an exaggeration to say that there is no longer any Neuroradiology without computed tomography. Does that mean that this new technique is infallible and that classical neuroradiological techniques are due to disappear in the near future? Experience shows that if certain techniques, such as gas encephalography, 'are less frequently employed since CT, others, such as cerebral angiography, are still commonly required.