Kích thích não sâu vùng nhân tegmental pedunculopontine: hướng tới một phương pháp phẫu thuật thần kinh lập thể mới

Journal of Neural Transmission - Tập 118 - Trang 1431-1451 - 2011
Paolo Mazzone1, Stefano Sposato2, Angelo Insola3, Eugenio Scarnati4
1Functional and Stereotactic Neurosurgery, CTO Hospital ASL Roma C, Rome, Italy
2Neuroradiology, CTO Hospital ASL Roma C, Rome, Italy
3Clinical Neurophysiopathology, CTO Hospital ASL Roma C, Rome, Italy
4Department of Biomedical Sciences and Technologies (STB), University of L’Aquila, L’Aquila, Italy

Tóm tắt

Việc áp dụng kích thích não sâu (DBS) vào nhân tegmental pedunculopontine (PPTg) đã yêu cầu những sửa đổi sâu sắc về các kỹ thuật phẫu thuật thần kinh cổ điển và các tiêu chí đánh giá kết quả lâm sàng. Bài tổng quan này phân tích một phương pháp mới nhằm nhắm mục tiêu đến PPTg, dựa trên chụp cắt lớp vi mạch (angio-CT) và tái xây dựng ba chiều các nhân và mạch máu não, đồng thời xem xét những lợi ích của việc áp dụng các phương pháp này so với phương pháp truyền thống hơn dựa trên các điểm tham khảo thu được thông qua việc đánh giá đường hai hội đồng. Việc xác thực các kết quả thu được sau khi kích thích đơn phương PPTg thông qua ghi nhận thần kinh sinh lý và các đo lường khách quan về các thông số chức năng cho thấy rằng PPTg có thể được coi là một đích ban đầu cho việc điều trị các triệu chứng vận động ở những bệnh nhân được chọn bị bệnh Parkinson nguyên phát (PD), mà nếu cần thiết, có thể tiếp tục kích thích não sâu ở các khu vực mục tiêu khác. Hơn nữa, dựa trên những quan sát từ việc kích thích PPTg, tính hữu dụng tiềm năng được quy cho đến nay đối với việc ghi nhận thần kinh sinh lý trong thời gian phẫu thuật để xác định các mục tiêu phẫu thuật thần kinh nên được xem xét lại, và nhu cầu thay đổi trong quản lý bệnh nhân trong thời gian phẫu thuật đã phát sinh từ khối lượng bằng chứng tích lũy trong những năm gần đây. Các kết quả thu được bởi các nhóm khác nhau sau khi kích thích DBS PPTg ở bệnh nhân Parkinson không đồng nhất, rất có thể do sự chấp nhận thận trọng phương pháp này, kinh nghiệm dần dần tích lũy, tiêu chí lựa chọn bệnh nhân và những khác biệt tinh tế trong vị trí mục tiêu. Mặc dù vai trò của PPTg trong PD và/hoặc trong các bệnh lý khác cần được làm rõ, việc theo đuổi phương pháp truyền thống với các mục tiêu hạch nền cổ điển có thể hạn chế triển vọng của DBS dựa trên nhiều cấy ghép.

Từ khóa

#Kích thích não sâu #nhân tegmental pedunculopontine #bệnh Parkinson #phẫu thuật thần kinh lập thể

Tài liệu tham khảo

Afshar F, Dykes E (1982) A three-dimensional reconstruction of the human brain stem. J Neurosurg 57:491–495 Afshar F, Watkins ES, Yap JC (1978) Stereotactic atlas of the human brainstem and cerebellar nuclei. Raven Press, New York Androulidakis AG, Mazzone P, Litvak V, Penny W, Dileone M, Gaynor LM, Tisch S, Di Lazzaro V, Brown P (2008) Oscillatory activity in the pedunculopontine area of patients with Parkinson’s disease. Exp Neurol 211:59–66 Aravamuthan BR, Muthusamy KA, Stein JF, Aziz TZ, Johansen-Berg H (2007) Topography of cortical and subcortical connections of the human pedunculopontine and subthalamic nuclei. Neuroimage 37:694–705 Aravamuthan BR, Stein JF, Aziz TZ (2008) The anatomy and localization of the pedunculopontine nucleus determined using probabilistic diffusion tractography. Br J Neurosurg 22(Suppl 1):S25–S32 Arnulf I (2006) Sleep and wakefulness disturbances in Parkinson’s disease. J Neural Transm Suppl (70)357–360 Arnulf I, Ferraye M, Fraix V, Benabid AL, Chabardes S, Goetz L, Pollak P, Debu B (2010) Sleep induced by stimulation in the human pedunculopontine nucleus area. Ann Neurol 67:546–549 Barciela CN, Fernandez Varela JM, Martin BB, Rilo PB, Suarez QJ, Gonzalez BJ, Varela PP (2002) Analysis of the area and length of masticatory cycles in male and female subjects. J Oral Rehabil 29:1160–1164 Benabid AL, Wallace B, Mitrofanis J, Xia R, Piallat B, Chabardes S, Berger F (2005) A putative generalized model of the effects and mechanism of action of high frequency electrical stimulation of the central nervous system. Acta Neurol Belg 105:149–157 Benazzouz A, Breit S, Koudsie A, Pollak P, Krack P, Benabid AL (2002) Intraoperative microrecordings of the subthalamic nucleus in Parkinson’s disease. Mov Disord 17(Suppl 3):S145–S149 Binder DK, Rau G, Starr PA (2003) Hemorrhagic complications of microelectrode-guided deep brain stimulation. Stereotact Funct Neurosurg 80:28–31 Binder DK, Rau GM, Starr PA (2005) Risk factors for hemorrhage during microelectrode-guided deep brain stimulator implantation for movement disorders. Neurosurgery 56:722–732 Braak H, Ghebremedhin E, Rub U, Bratzke H, Del Tredici K (2004) Stages in the development of Parkinson’s disease-related pathology. Cell Tissue Res 318:121–134 Ceravolo R, Brusa L, Galati S, Volterrani D, Peppe A, Siciliano G, Pierantozzi M, Moschella V, Bonuccelli U, Stanzione P, Stefani A (2010) Low frequency stimulation of the nucleus tegmenti pedunculopontini increases cortical metabolism in Parkinsonian patients. Eur J Neurol (Epub ahead of print) Costa A, Carlesimo GA, Caltagirone C, Mazzone P, Pierantozzi M, Stefani A, Peppe A (2010) Effects of deep brain stimulation of the peduncolopontine area on working memory tasks in patients with Parkinson’s disease. Parkinsonism Relat Disord 16:64–67 Fedele E, Mazzone P, Stefani A, Bassi A, Ansaldo MA, Raiteri M, Altibrandi MG, Pierantozzi M, Giacomini P, Bernardi G, Stanzione P (2001) Microdialysis in Parkinsonian patient basal ganglia: acute apomorphine-induced clinical and electrophysiological effects not paralleled by changes in the release of neuroactive amino acids. Exp Neurol 167:356–365 Fendt M, Li L, Yeomans JS (2001) Brain stem circuits mediating prepulse inhibition of the startle reflex. Psychopharmacology (Berl) 156:216–224 Ferraye MU, Gerardin P, Debu B, Chabardes S, Fraix V, Seigneuret E, LeBas JF, Benabid AL, Tilikete C, Pollak P (2009) Pedunculopontine nucleus stimulation induces monocular oscillopsia. J Neurol Neurosurg Psychiatry 80:228–231 Ferraye MU, Debu B, Fraix V, Goetz L, Ardouin C, Yelnik J, Henry-Lagrange C, Seigneuret E, Piallat B, Krack P, Le Bas JF, Benabid AL, Chabardes S, Pollak P (2010) Effects of pedunculopontine nucleus area stimulation on gait disorders in Parkinson’s disease. Brain 133:205–214 Garcia-Rill E (1991) The pedunculopontine nucleus. Prog Neurobiol 36:363–389 Hariz MI, Fodstad H (1999) Do microelectrode techniques increase accuracy or decrease risks in pallidotomy and deep brain stimulation? A critical review of the literature. Stereotact Funct Neurosurg 72:157–169 Hariz M, Blomstedt P, Limousin P (2004) The myth of microelectrode recording in ensuring a precise location of the DBS electrode within the sensorimotor part of the subthalamic nucleus. Mov Disord 19:863–864 Hawkes CH, Del Tredici K, Braak H (2010) A timeline for Parkinson’s disease. Parkinsonism Relat Disord 16:79–84 Hemm S, Mennessier G, Vayssiere N, Cif L, El Fertit H, Coubes P (2005) Deep brain stimulation in movement disorders: stereotactic coregistration of two-dimensional electrical field modelling and magnetic resonance imaging. J Neurosurg 103:949–955 Honey CR, Berk C, Palur RS, Schulzer M (2001) Microelectrode recording for pallidotomy: mandatory, beneficial or dangerous? Stereotact Funct Neurosurg 77:98–100 Inglis WL, Winn P (1995) The pedunculopontine tegmental nucleus: where the striatum meets the reticular formation. Prog Neurobiol 47:1–29 Insola A, Padua A, Scarnati E, Valeriani M (2010) Where are the somatosensory evoked potentials recorded from DBS leads implanted in the pedunculopontine tegmental nucleus generated. Mov Disord (in press) Khan S, Javed S, Park N, Gill SS, Patel NK (2010) A magnetic resonance imaging-directed method for transventricular targeting of midline structures for deep brain stimulation using implantable guide tubes. Neurosurgery 66:234–237 Kretschmer BD, Koch M (1998) The ventral pallidum mediates disruption of prepulse inhibition of the acoustic startle response induced by dopamine agonists, but not by NMDA antagonists. Brain Res 798:204–210 Lavoie B, Parent A (1994) Pedunculopontine nucleus in the squirrel monkey: projections to the basal ganglia as revealed by anterograde tract-tracing methods. J Comp Neurol 344:210–231 Laxton AW, Tang-Wai DF, McAndrews MP, Zumsteg D, Wennberg R, Keren R, Wherrett J, Naglie G, Hamani C, Smith GS, Lozano AM (2010) A phase I trial of deep brain stimulation of memory circuits in Alzheimer’s disease. Ann Neurol 68:521–534 Lee KH, Chang SY, Roberts DW, Kim U (2004) Neurotransmitter release from high-frequency stimulation of the subthalamic nucleus. J Neurosurg 101:511–517 Lim AS, Lozano AM, Moro E, Hamani C, Hutchison WD, Dostrovsky JO, Lang AE, Wennberg RA, Murray BJ (2007) Characterization of REM-sleep associated ponto-geniculo-occipital waves in the human pons. Sleep 30:823–827 Lim AS, Moro E, Lozano AM, Hamani C, Dostrovsky JO, Hutchison WD, Lang AE, Wennberg RA, Murray BJ (2009) Selective enhancement of rapid eye movement sleep by deep brain stimulation of the human pons. Ann Neurol 66:110–114 Lipsman N, McIntyre RS, Giacobbe P, Torres C, Kennedy SH, Lozano AM (2010) Neurosurgical treatment of bipolar depression: defining treatment resistance and identifying surgical targets. Bipolar Disord 12:691–701 Lubik S, Fogel W, Tronnier V, Krause M, Konig J, Jost WH (2006) Gait analysis in patients with advanced Parkinson disease: different or additive effects on gait induced by levodopa and chronic STN stimulation. J Neural Transm 113:163–173 Mazzone P (2001) Il sistema stereotassico 3P Maranello. Europa Medicophysica 3:318–319 Mazzone P (2003) Deep brain stimulation in Parkinson’s disease: bilateral implantation of globus pallidus and subthalamic nucleus. J Neurosurg Sci 47:47–51 Mazzone P, Scarnati E (2009) Deep brain stimulation of the medial thalamus for movement disorders: the role of centromedian-parafascicular complex. In: Krames ES, Peckham PH, Rezai AR (eds) Neuromodulation. Academic Press, New York, pp 599–615 Mazzone P, Brown P, Dilazzaro V, Stanzione P, Oliviero A, Peppe A, Santilli V, Insola A, Altibrandi M (2005a) Bilateral implantation in globus pallidus internus and in subthalamic nucleus in Parkinson’s disease. Neuromodulation 8:1–6 Mazzone P, Lozano A, Stanzione P, Galati S, Scarnati E, Peppe A, Stefani A (2005b) Implantation of human pedunculopontine nucleus: a safe and clinically relevant target in Parkinson’s disease. Neuroreport 16:1877–1881 Mazzone P, Stanzione P, Lozano A, Sposato S, Scarnati E, Stefani A (2005c) Brain stimulation and movement disorders: where are we going? In: Meglio M (ed) Proceedings of the 14th meeting of the World Society for Stereotactic and Functional Neurosurgery (WSSFN) Monduzzi, Bologna, Italy Mazzone P, Insola A, Lozano A, Galati S, Scarnati E, Peppe A, Stanzione P, Stefani A (2007a) Peripeduncular and pedunculopontine nuclei: a dispute on a clinically relevant target. Neuroreport 18:1407–1408 Mazzone P, Stanzione P, Lozano A, Scarnati E, Peppe A, Galati S, Stefani A (2007b) The peripeduncular and pedunculopontine nuclei: a putative dispute not discouraging the effort to define a clinically relevant target. Brain 130:E74 Mazzone P, Della Marca G, Sposato S, Di Lazzaro V, Scarnati E (2008a) Tridimensional modelling of midbrain and pontine structures: a proposed approach to the stereotactic targeting of nucleus pedunculopontine tegmenti. Neurotarget 3:8–20 Mazzone P, Sposato S, Insola A, Di Lazzaro V, Scarnati E (2008b) Surgery of nucleus tegmenti pedunculopontini. Br J Neurosurg 22(Suppl 1):S33–S40 Mazzone P, Insola A, Sposato S, Scarnati E (2009) The deep brain stimulation of the pedunculopontine tegmental nucleus. Neuromodulation 12:191–204 Mazzone P, Falise G, Paoloni M, Scarnati E (2011) The deep brain stimulation of nucleus tegmenti pedunculopontini: a target for Parkinson’s disease. In: Lavano A, Landi A, Lanotte MM (eds) Handbook of stereotaxic and functional neurosurgery. Minerva Medica, Rome, pp 70–76 Moro E, Hamani C, Poon YY, Al Khairallah T, Dostrovsky JO, Hutchison WD, Lozano AM (2010) Unilateral pedunculopontine stimulation improves falls in Parkinson’s disease. Brain 133:215–224 Muthusamy KA, Aravamuthan BR, Kringelbach ML, Jenkinson N, Voets NL, Johansen-Berg H, Stein JF, Aziz TZ (2007) Connectivity of the human pedunculopontine nucleus region and diffusion tensor imaging in surgical targeting. J Neurosurg 107:814–820 Nakashima K, Wang Y, Shimoda M, Shimoyama R, Yokoyama Y, Takahashi K (1994) Auditory effects on the motor responses after magnetic cortical stimulation and on the H-reflexes in patients with Parkinson’s disease. J Neurol Sci 122:15–19 Niemann K, van den Boom R, Haeselbarth K, Afshar F (1999) A brainstem stereotactic atlas in a three-dimensional magnetic resonance imaging navigation system: first experiences with atlas-to-patient registration. J Neurosurg 90:891–901 Nieuwenhuys R, Wood J, van Huijzen C (1988) The human central nervous system. A synopsis and atlas. Springer, Berlin Okun MS, Fernandez HH, Wu SS, Kirsch-Darrow L, Bowers D, Bova F, Suelter M, Jacobson CE, Wang X, Gordon CW Jr, Zeilman P, Romrell J, Martin P, Ward H, Rodriguez RL, Foote KD (2009) Cognition and mood in Parkinson’s disease in subthalamic nucleus versus globus pallidus interna deep brain stimulation: the COMPARE trial. Ann Neurol 65:586–595 Olszewski J, Baxter D (1982) Cytoarchitecture of the human brain stem. Karger, Basel (Switzerland) Ostrem JL, Christine CW, Glass GA, Schrock LE, Starr PA (2010) Pedunculopontine nucleus deep brain stimulation in a patient with primary progressive freezing gait disorder. Stereotact Funct Neurosurg 88:51–55 Pahapill PA, Lozano AM (2000) The pedunculopontine nucleus and Parkinson’s disease. Brain 123:1767–1783 Paxinos G, Huang XF (1995) Atlas of the human brainstem. Academic Press, San Diego Peppe A, Pierantozzi M, Bassi A, Altibrandi MG, Brusa L, Stefani A, Stanzione P, Mazzone P (2004) Stimulation of the subthalamic nucleus compared with the globus pallidus internus in patients with Parkinson disease. J Neurosurg 101:195–200 Peppe A, Pierantozzi M, Chiavalon C, Marchetti F, Caltagirone C, Musicco M, Stanzione P, Stefani A (2010) Deep brain stimulation of the pedunculopontine tegmentum and subthalamic nucleus: effects on gait in Parkinson’s disease. Gait Posture 32:512–518 Piallat B, Chabardes S, Torres N, Fraix V, Goetz L, Seigneuret E, Bardinet E, Ferraye M, Debu B, Krack P, Yelnik J, Pollak P, Benabid AL (2009) Gait is associated with an increase in tonic firing of the sub-cuneiform nucleus neurons. Neuroscience 158:1201–1205 Pierantozzi M, Palmieri MG, Galati S, Stanzione P, Peppe A, Tropepi D, Brusa L, Pisani A, Moschella V, Marciani MG, Mazzone P, Stefani A (2008) Pedunculopontine nucleus deep brain stimulation changes spinal cord excitability in Parkinson’s disease patients. J Neural Transm 115:731–735 Plaha P, Gill SS (2005) Bilateral deep brain stimulation of the pedunculopontine nucleus for Parkinson’s disease. Neuroreport 16:1883–1887 Reese NB, Garcia-Rill E, Skinner RD (1995) The pedunculopontine nucleus—auditory input, arousal and pathophysiology. Prog Neurobiol 47:105–133 Robertson LT, Hammerstad JP (1996) Jaw movement dysfunction related to Parkinson’s disease and partially modified by levodopa. J Neurol Neurosurg Psychiatry 60:41–50 Robertson LT, Horak FB, Anderson VC, Burchiel KJ, Hammerstad JP (2001) Assessments of axial motor control during deep brain stimulation in parkinsonian patients. Neurosurgery 48:544–551 Rodriguez-Oroz MC, Obeso JA, Lang AE, Houeto JL, Pollak P, Rehncrona S, Kulisevsky J, Albanese A, Volkmann J, Hariz MI, Quinn NP, Speelman JD, Guridi J, Zamarbide I, Gironell A, Molet J, Pascual-Sedano B, Pidoux B, Bonnet AM, Agid Y, Xie J, Benabid AL, Lozano AM, Saint-Cyr J, Romito L, Contarino MF, Scerrati M, Fraix V, Van Blercom N (2005) Bilateral deep brain stimulation in Parkinson’s disease: a multicentre study with 4 years follow-up. Brain 128:2240–2249 Sacchettoni SA, Rada P, Teneud L, Galué R, Poincaré Abud J, Félix Del Corral J (2010) Microdiálisis cerebral, una herramienta promisoria para el estudio neuroquímico en neurocirugía: Una descripción técnica. Neurotarget 5:30–43 Scarnati E, Florio T (1997) The pedunculopontine nucleus and related structures. Functional organization. Adv Neurol 74:97–110 Schaltenbrand G, Wahren W (1977) Atlas for stereotaxy of the human brain. Thieme, New York Schweder PM, Hansen PC, Green AL, Quaghebeur G, Stein J, Aziz TZ (2010a) Connectivity of the pedunculopontine nucleus in parkinsonian freezing of gait. Neuroreport 21:914–916 Schweder PM, Joint C, Hansen PC, Green AL, Quaghebeur G, Aziz TZ (2010b) Chronic pedunculopontine nucleus stimulation restores functional connectivity. Neuroreport 21:1065–1068 Shimamoto SA, Larson PS, Ostrem JL, Glass GA, Turner RS, Starr PA (2010) Physiological identification of the human pedunculopontine nucleus. J Neurol Neurosurg Psychiatry 81:80–86 Stefani A, Fedele E, Galati S, Pepicelli O, Frasca S, Pierantozzi M, Peppe A, Brusa L, Orlacchio A, Hainsworth AH, Gattoni G, Stanzione P, Bernardi G, Raiteri M, Mazzone P (2005) Subthalamic stimulation activates internal pallidus: evidence from cGMP microdialysis in PD patients. Ann Neurol 57:448–452 Stefani A, Lozano AM, Peppe A, Stanzione P, Galati S, Tropepi D, Pierantozzi M, Brusa L, Scarnati E, Mazzone P (2007) Bilateral deep brain stimulation of the pedunculopontine and subthalamic nuclei in severe Parkinson’s disease. Brain 130:1596–1607 Stefani A, Pierantozzi M, Ceravolo R, Brusa L, Galati S, Stanzione P (2010) Deep brain stimulation of pedunculopontine tegmental nucleus (PPTg) promotes cognitive and metabolic changes: a target-specific effect or response to a low-frequency pattern of stimulation? Clin EEG Neurosci 41:82–86 Sterio D, Zonenshayn M, Mogilner AY, Rezai AR, Kiprovski K, Kelly PJ, Beric A (2002) Neurophysiological refinement of subthalamic nucleus targeting. Neurosurgery 50:58–67 Stolze H, Klebe S, Poepping M, Lorenz D, Herzog J, Hamel W, Schrader B, Raethjen J, Wenzelburger R, Mehdorn HM, Deuschl G, Krack P (2001) Effects of bilateral subthalamic nucleus stimulation on parkinsonian gait. Neurology 57:144–146 Stone S, Hamani C, Lozano AM (2009) Pedunculopontine nucleus stimulation for Parkinson’s disease. In: Lozano AM, Gildemberg PL, Tasker RR (eds) Textbook of stereotaxic functional neurosurgery. Springer, Berlin, pp 1649–1663 Strafella AP, Lozano AM, Ballanger B, Poon YY, Lang AE, Moro E (2008) rCBF changes associated with PPN stimulation in a patient with Parkinson’s disease: a PET study. Mov Disord 23:1051–1054 Swerdlow NR, Geyer MA, Braff DL (2001) Neural circuit regulation of prepulse inhibition of startle in the rat: current knowledge and future challenges. Psychopharmacology (Berl) 156:194–215 Tabbal SD, Ushe M, Mink JW, Revilla FJ, Wernle AR, Hong M, Karimi M, Perlmutter JS (2008) Unilateral subthalamic nucleus stimulation has a measurable ipsilateral effect on rigidity and bradykinesia in Parkinson disease. Exp Neurol 211:234–242 Talairach J, David M, Tornoux P, Corredor H, Kvasina T (1957) Atlas d’anatomie stereotaxique des noyaux gris centraux. Masson, Paris Thevathasan W, Silburn PA, Brooker H, Coyne TJ, Khan S, Gill SS, Aziz TZ, Brown P (2010) The impact of low-frequency stimulation of the pedunculopontine nucleus region on reaction time in parkinsonism. J Neurol Neurosurg Psychiatry 81:1099–1104 Weinberger M, Mahant N, Hutchison WD, Lozano AM, Moro E, Hodaie M, Lang AE, Dostrovsky JO (2006) Beta oscillatory activity in the subthalamic nucleus and its relation to dopaminergic response in Parkinson’s disease. J Neurophysiol 96:3248–3256 Weinberger M, Hamani C, Hutchison WD, Moro E, Lozano AM, Dostrovsky JO (2008) Pedunculopontine nucleus microelectrode recordings in movement disorder patients. Exp Brain Res 188:165–174 Wilcox RA, Cole MH, Wong D, Coyne T, Silburn P, Kerr G (2010) Pedunculopontine nucleus deep brain stimulation produces sustained improvement in primary progressive freezing of gait. J Neurol Neurosurg Psychiatry Yeh IJ, Tsang EW, Hamani C, Moro E, Mazzella F, Poon YY, Lozano AM, Chen R (2010) Somatosensory evoked potentials recorded from the human pedunculopontine nucleus region. Mov Disord 25:2076–2083 Yelnik J (2007) PPN or PPD, what is the target for deep brain stimulation in Parkinson’s disease? Brain 130:e79 Yelnik J, Bardinet E, Dormont D, Malandain G, Ourselin S, Tande D, Karachi C, Ayache N, Cornu P, Agid Y (2007) A three-dimensional, histological and deformable atlas of the human basal ganglia. I. Atlas construction based on immunohistochemical and MRI data. Neuroimage 34:618–638 Young RF, Tronnier V, Rinaldi PC (1992) Chronic stimulation of the Kolliker-Fuse nucleus region for relief of intractable pain in humans. J Neurosurg 76:979–985 Zanini S, Moschella V, Stefani A, Peppe A, Pierantozzi M, Galati S, Costa A, Mazzone P, Stanzione P (2009) Grammar improvement following deep brain stimulation of the subthalamic and the pedunculopontine nuclei in advanced Parkinson’s disease: a pilot study. Parkinsonism Relat Disord 15:606–609 Zrinzo L, Zrinzo LV, Hariz M (2007a) The pedunculopontine and peripeduncular nuclei: a tale of two structures. Brain 130:e73 Zrinzo L, Zrinzo LV, Hariz M (2007b) The peripeduncular nucleus: a novel target for deep brain stimulation? Neuroreport 18:1301–1302 Zrinzo L, Zrinzo LV, Tisch S, Limousin PD, Yousry TA, Afshar F, Hariz MI (2008) Stereotactic localization of the human pedunculopontine nucleus: atlas-based coordinates and validation of a magnetic resonance imaging protocol for direct localization. Brain 131:1588–1598 Zrinzo L, van Hulzen AL, Gorgulho AA, Limousin P, Staal MJ, De Salles AA, Hariz MI (2009) Avoiding the ventricle: a simple step to improve accuracy of anatomical targeting during deep brain stimulation. J Neurosurg 110:1283–1290