Orbital Apex and Periorbital Skull Base Diseases

This book is designed to have a comprehensive review of the spectrum of diseases involving orbital apex and periorbital skull base and the up-to-date advancement in different treatment modalities.
Management of diseases at the orbital apex and periorbital skull base has always been a challenge. Multiple specialties are involved, including skull base neurosurgeon, oculoplastic ophthalmologist, otorhinolaryngologist, head and neck surgeon, oncologist, neurologist and radiologist. However, frequently it results into a 'no-man's land', as no single specialty is entirely familiar with this complex and overlapping anatomical territory. Cranial nerves, carotid artery, and cavernous sinus are just one of the few examples of important anatomical structures that pass through. However, this has often been managed by one specialty especially during surgical planning and operation, resulting in biases in choices of approach and surgical strategies. We believe that this interesting yet complex region deserves special attention with a well-orchestrated multi-disciplinary effort.
Traditionally, surgical treatments for diseases in this region involve different types of craniotomy and orbitotomy.  In this book, it covers the advancement in imaging modalities, medical therapies, operative instruments, radiation therapy namely stereotactic radiosurgery or radiotherapy, management of diseases in orbital apex and periorbital skull base evolve and improve with time.  Minimally invasive surgery in terms of mastering neuro-endoscopy contributes to the intervention advancement.  

Dr. Poon graduated from the medical school of the University of Hong Kong in 1998.  In 2006, He stayed in London with Mr. William Harkness from the Great Ormond Street Hospital and Mr. Andrew McEvoy from the National Hospital for Neurology and Neurosurgery as his overseas training in the fields of epilepsy surgery and stereotactic and functional neurosurgery.  Currently, Dr. Poon is the Deputy Chief of Service and Consultant Neurosurgeon of the Queen Elizabeth Hospital, and Clinical Associate Professor (Honorary) of the Department of Surgery, Chinese University of Hong Kong, and coordinator of the neurosurgical services including stereotactic and functional neurosurgery, epilepsy surgery, movement disorder, stereotactic radiosurgery, and endovascular surgery.  His interested sub-specialties in Neurosurgery include movement disorder surgery, epilepsy surgery, awake craniotomy, stereotactic and functional neurosurgery, stereotactic radiosurgery and endovascular intervention.  Besides, Dr. Poon is the current President of the Hong Kong Epilepsy Society, the council members of the Hong Kong Movement Disorder Society, and the board member of the executive committee of the Asian-Australasian Society for Stereotactic and Functional Neurosurgery, and council member of the Hong Kong Society of Interventional & Therapeutic NeuroRadiology.


Dr Calvin Mak is a consultant neurosurgeon at Queen Elizabeth Hospital in Hong Kong, and is also appointed as Clinical Associate Professor (Honorary) of the Department of Surgery in the Chinese University of Hong Kong. He graduated from the University of Hong Kong and obtained his FRCSEd(SN) fellowship. His main clinical and research interests are endoscopic and complex skull base surgery. Dr. Mak performed the first endoscopic transorbital surgery for brain tumors in Hong Kong, and is course director for dissection courses on endoscopic transorbital surgery. He has been invited as faculty and instructor for various international skull base courses and meetings. Dr. Mak currently serves as Honorary Secretary of the Hong Kong Neurosurgical Society, First Vice-President of the Hong Kong Neuro-oncology Society, Executive Board member of the Asian Congress of Neurological Surgeons, delegates to the Executive Committee of AASNS and WFNS, council member of the China Greater Bay Area Neurosurgical Alliance. He is also a pioneer in smart hospital development and digital transformation of hospitals in Hong Kong. Dr. Mak was awarded the Ten Outstanding Young Persons in Hong Kong in 2022. He also received the Outstanding Team Award in 2021 and the Young Achiever Award in 2020 from the Hospital Authority of Hong Kong for his contributions and aspirations.


Professor Hunter Yuen is Hong Kong Eye Hospital Deputy Hospital Chief Executive, consultant ophthalmologist and head of Orbital and Oculoplastic Service. He is also the chairman of Ophthalmology Coordinating Committee of the Hospital Authority in Hong Kong.
Prof Yuen is the Clinical Professor (Hon) of The Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong; Honorary Professor of Department of Ophthalmology, Hong Kong University. He has published more than 110 peer reviewed international publications and numerous book chapters.
Prof Yuen is the
-         past president of Asia Pacific Society of Ophthalmic Plastic and Reconstructive Surgery (APSOPRS)
-         Vice president of International Society of Dacryology and Dry Eye (ISDDE)
-         Secretary general of Asia Pacific Society of Ocular Oncology and Pathology (APSOOP)
-         Member of Orbital Society
-         Fellow of Academy of Asia-Pacific Professors of Ophthalmology (AAPPO)
-         One of the Ten Young Outstanding Persons in Hong Kong in 2007.
-         He was also awarded with the Asia Pacific Academy of Ophthalmology (APAO) Yasuo Tano Travel Grant, APAO Distinguished Service Award, APAO Achievement Award and APAO Outstanding Service in Prevention of Blindness Award. APAO senior Achievement Award.
-         With his outstanding involvement and achievements in numerous NGOs and charity activities, Prof Yuen was awarded with the Hong Kong Volunteer Award in 2011.
-         Prof Yuen was also invited as visiting Professor of Zhejiang University, China; Dalian Medical University, China; Shantou University Medical College, China; King Khaled Eye Specialist Hospital (KKESH), Saudi Arabia
-         Prof Yuen was selected as 'Asia-Pacific Eye 100', one of the 100 most influential Ophthalmologists 2022 by the Asia- Pacific Journal of Ophthalmology (APJO)