He has spent several sabbatical periods at the University of Pittsburgh (Prof. P.J.Jannetta), mastering the neuro-vascular decompression techniques; University of California at Los Angeles and House Ear Institute (U.S.A.); Neurosurgical Clinic in Hannover (Prof. M.Samii); Neurosurgical Clinic in Vienna (Prof. Koos), dedicating all his efforts in the fields of microneurosurgery of the nerves and vessels in the posterior fossa and microtechniques for preservation of hearing function during removal of acoustic tumors or other c.p.a. lesions. In fact he has always posed special dedication on the preservation of hearing in acoustic neurinoma surgery. Dr.Gandolfi has become Professor of Neurosurgery at the University of Parma in 1991 and mantains this position with full satisfaction of the Faculty. Filds of preferential activities are constituted by: treatment of Trigeminal Neuralgia and Hemifacial Spasm (and also other neuro-vascular syndromes) using 'a minima' retrosigmoid approach; microneurosurgery of expanding lesions in the cerebello-pontine angle (acoustic tumors, meningiomas..) with preservation of neural integrity, especially facial nerve and cochlear (auditory) nerve postoperative functions. Neurovascular Decompression procedures (DNV) for the Trigeminal and Facial nerve do represent the main field of interest, both in surgical practice and clinical research, of the Author. He has contributed to the development of innovative surgical techniques in order to get stable and optimal results from the Decompressive procedures.