Medical specialists – Top Doctors UK
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Professional statement

Dr Mashkur Khan is a leading London-based consultant physician, with a special interest in geriatric medicine and diseases common in the elderly population, such as dementia, Parkinson's disease and syncope.

From his main base at Nuffield Health Guildford Hospital, and his private clinics across Epsom, Weybridge, Guildford and New Malden, he provides clinical excellence in all aspects of general medicine. He is also the Dementia Lead at Epsom and St Helier University Hospitals NHS Trust.

Dr Khan deals with multi-system pathology and has vast experience in multi-system diseases which affect the quality of life of the patient, such as complex fainting and blackouts. He is also an expert in treating balance disorders and dizziness. 

Dr Khan is also considerably experienced in treating patients who present with an acute crisis, diagnostic dilemmas and atypical presentations. This could include unexplained weakness, weight loss or anaemia.

Alongside his clinical practice at the Nuffield Health Guildford Hospital, Dr Khan also devotes time to teaching and examining future doctors. He is an Honorary Senior Lecturer at St. George´s, University of London, as well as an examiner for the Membership of the Royal College of Physicians (MRCP) clinical examination, both in the UK and internationally.

Dr Khan has also been the District Tutor for the Royal Collge of Physicians at Epsom General Hospital, and a member of the Training Programme Board of the South West Sector London Deanery for Geriatric Medicine. He has given numerous lectures on syncope, and the possible causes of blackouts and loss of consciousness. In 2022, he began a highly esteemed three year visiting fellowship in partnership with The Geller Institute of Ageing and Memory and the University of West London.

He is an active member of a number of associations in his field, including the Royal Society of Medicine and the Movement Disorder Society, USA. He has previously held the position of Section President of the Royal Society of Medicine and currently sits on the Section Council.

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Dr Sharmistha Guha is a leading consultant obstetrician and gynaecologist based in London. After graduating in 2000 at the prestigious All India Institute of Medical Sciences (AIIMS) in New Delhi, Miss Guha began her career in Obstetrics and Gynaecology.

She developed a special interest in early pregnancy and acute gynaecology and took a period of time out of her training to develop research in this field at Chelsea and Westminster Hospital. She has several papers in peer-reviewed journals which have further enhanced her credentials. She has conducted several multi-centred early pregnancy research projects, including studies in both pregnancy of unknown location and uncertain viability.

Miss Guha is a regular speaker at both international and national forums alike and is both extremely knowledgeable and proficient in performing early gynaecology and early pregnancy ultrasound. She has a post graduate certificate in this area which she was awarded for by Kings College in 2011. She was recognised as a substantive consultant in Obsterics and Gynaecology at West Middlesex University Hospital in November 2013 and currently works in some of London’s most prestigious hospitals after having obtained a CCT in the same year.

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Mr Sai Kolli is a highly trained and skilled consultant ophthalmic surgeon with over 20 years of professional experience.

He has leading expertise in performing numerous surgeries, including cataract surgery and corneal surgery. In fact, Mr Kolli is the lead consultant for cataract and corneal surgery at University Hospitals Birmingham. Furthermore, he is one of the few consultants who have been fellowship trained in corneal and external disease as well as cataract and refractive surgery. He also regularly performs laser eye surgery, vision correction surgery, premium lens surgery and treatment for dry eye. 

Mr Kolli underwent extensive studies and training. He graduated with First Class Honours from the University of Cambridge followed by the acquisition of his membership of The Royal College of Ophthalmologists (RCOphth) in 2001. In 2005, he became a Fellow of the RCOphth and, in 2009, he achieved his PhD award after three years of academic research in stem cell biology. What's more, he completed his specialist training at the world-renowned Moorfields Eye Hospital where he started as a consultant in 2010.

As a national expert in cornea, cataract and refractive surgery, he lectures across the UK and internationally to share his experience and research with many medical professionals. 

Mr Kolli's knowledge and skill mean he can offer tailor-made treatment to ensure patients receive the best possible outcomes. He prides himself on his open and honest approach and provides first-class medical and surgical eye services to patients across the Birmingham region and beyond.

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Dr Omar Salim is an esteemed consultant neurologist based in Staffordshire. He holds expertise in a wide range of neurological disorders, including multiple sclerosis, movement disorders, headaches, epilepsy, neuromuscular injections, functional neurological disorders and Parkinson’s disease.
 
Dr Salim graduated with honours from Baghdad College of Medicine in 2010, quickly rising to prominence in his field. He undertook advanced neurology training in the UK after earning his MD in general internal medicine in 2016 at the University of Buckingham.

Since January 2022, Dr Salim has thrived as a consultant at the University Hospitals of North Midlands, focusing on various neurological disorders, particularly multiple sclerosis (MS) and related conditions. His dedication to medical education is evident through his active mentorship of junior doctors and involvement in clinical trials and research, significantly advancing neurological medicine.
 
Renowned for his empathetic and innovative patient-centred approach, Dr Salim is a highly sought-after practitioner. His exceptional expertise ensures personalised neurological care, optimising outcomes for patients facing a range of neurological challenges.

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Dr (Deborah) Sanju Arianayagam is a leading consultant dermatologist based in Reading who specialises in eczema, photodynamic therapy and rosacea alongside vitiligo, acne and warts. She also provides expert treatment in hair loss.  She privately practises at Derma Reading clinic and her NHS base is Oxford University Hospitals NHS Foundation Trust.

Dr Arianayagam is highly respected as a practitioner, academic leader and clinical researcher. She possesses various qualifications including an MA in Medical Sciences and a BM BCh from the University of Oxford as well as an SCE Dermatology diploma and an MRCP from the Royal College of Physicians (London). 

She undertook her final year elective of her undergraduate training in the John Hopkins Department of Dermatology in Baltimore, USA. Dr Arianayagam then went on to undertake an academic foundation programme in London, which encompassed working on a large epidemiological study at the Royal Free Hospital. This was presented and published internationally. 

Following this, she did a year-long clinical fellowship in dermatology at Addenbrooke's Hospital in Cambridge, and then completed her dermatology training in the Thames Valley Deanery.   

Dr Arianayagam is also noted for her work at the European Journal of Dermatology as a UK representative for the Residents' board, and Trainee representative for Health Education Thames Valley at the British Association of Dermatology.

Currently she is a tutor on the postgraduate Dermatology course at the University of South Wales. Dr Arianayagam has also presented seminars at Green Templeton College at the University of Oxford, and been a postgraduate teacher at Oxford University Hospitals NHS Foundation Trust. 

Dr Arianayagam has presented her research at national and international conferences, and it has also been featured in various peer-reviewed journals and book chapters. She is a member of the Royal College of Physicians (London). 

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Professional statement

Dr Spyros Bakalis is an extremely well-regarded consultant in obstetrics and maternal and fetal medicine who possesses expertise in conditions and areas such as multiple pregnancy, fetal and maternal medicine, childbirth, pregnancy, high-risk pregnancy, as well as the management of risk pregnancy and birthing. Presently, he practises at the London-based The Harley Street Centre For Women.

Dr Bakalis, who completed his undergraduate training at the highly established Guy's, King's and St Thomas' Medical School, was first appointed to the Guy's and St Thomas' Hospital in 2017, where he was given the crucial role in the fetal medicine unit, where he, since his appointment, has held the responsibility of carrying out various different therapeutic and diagnostic services. He has a particularly strong interest in growth complications in foetuses, as well as brain anomalies and placental abnormalities. 

Dr Bakalis successfully completed postgraduate training throughout both London as well as the West Midlands, during which he developed a vast amount of experience and expertise in relation to the management of both low-risk and high-risk pregnancies. He then decided to undertake research at the Harris Birthright Research Centre for Fetal Medicine, King’s College London, where he was deservedly awarded an MD for his extensive work.

Impressively, Dr Bakalis has also been officially accredited by the Royal College of Obstetricians and Gynaecologists with a subspecialty level of expertise in maternal and fetal medicine after undergoing training in all aspects of fetal and maternal medicine. 

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Mr David Elson is a leading consultant trauma and orthopaedic surgeon who specialises in knee conditions and knee surgery. He aims to take time assessing the problem for each individual patient, in order to provide bespoke treatment options, leading to the best possible patient outcomes. Mr Elson holds private clinics at Cobalt Hospital in Silverlink, Newcastle Upon Tyne. Mr Elson attends to the needs of adult patients as well as children above the age of 12.

Mr Elson will explore the possibility of biological alternatives to knee replacement. This joint preserving or biological knee surgery may include knee arthroscopy; meniscal surgery (such as resection or repair, or in some cases meniscal transplantation); knee osteotomy to straighten your leg; ligament reconstruction to stabilise your knee (such as ACL reconstruction or ACL repair), in a few cases knee cartilage replacement surgery may be possible. In advanced arthritis, Mr Elson performs partial knee replacement and total knee replacement.

Mr Elson has contributed to his field via medical research, with over 20 publications in the medical literature; the majority concerning knee surgery - particularly knee osteotomy and knee pain. This research has been presented on national and international stages.  

Mr Elson is the Chairman of the United Kingdom Knee Osteotomy Registry, established to further human understanding of knee osteotomy as a powerful treatment option. He is co-convener of the Northern Osteotomy Masterclass, which has become the largest cadaveric knee osteotomy course in the world, educating other surgeons on the safest and best techniques to perform knee osteotomy.

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Ms Tahmina Pearsall is an experienced consultant ophthalmologist who has performed more than 50.000 procedures. She has a special interest in complex cataract surgery and glaucoma. Ms Pearsall is based in London, Horley, Surrey, and Brighton and Hove. Ms Pearsall offers a full range of procedures for glaucoma treatment ranging from traditional surgical options such as trabeculectomy and tube surgery to minimally-invasive surgical techniques and laser surgery. She also runs a general ophthalmology service covering minor operations and all aspects of emergency care.
 
After qualifying from the University of Manchester in 1993, Ms Pearsall underwent extensive training in centres of excellence such as Moorfields Eye Hospital, St Thomas’ and Addenbrooke's (Cambridge). She was previously consultant ophthalmic surgeon and lead clinician for glaucoma at Whipps Cross University Hospital. She is currently a glaucoma consultant at Surrey and Sussex Hospital.

Ms Persall is devoted to educating her fellows, organising teaching sessions as well as continually providing lectures to other physicians in formal ophthalmology courses. She has been appointed as an examiner for the Royal College of Ophthalmology, London, and her research has won prizes both nationally and internationally.

She is a member of several professional medical bodies, including the European Society of Cataract and Refractive Surgeons and the British Society for Refractive Surgery. In addition, she is a felllow of the Royal College of Surgeons Edinburgh and the Royal College of Ophthalmologists, London. 

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Dr Thaj Rehman is a highly skilled and experienced consultant radiologist based in London and Essex, offering expertise in a range of specialised diagnostic services. Dr Rehman's areas of expertise encompass a comprehensive array of diagnostic modalities, including liver fibrosis scans, breast cancer scans, breast mammograms/mammography, thyroid scans and biopsy, paediatric scans and X-rays, as well as MRI and CT scans.

With over 15 years of dedicated professional experience, Dr Rehman currently serves as a consultant radiologist at Nuffield Health Brentwood Hospital, Spire London East Hospital, and Lyca Health Canary Wharf.

In terms of academic achievements, Dr Rehman has consistently demonstrated a commitment to excellence. He earned both an MBBS and an MD before going on to receive the prestigious FRCR qualification from the Royal College of Radiologists. Fluent in English, Hindi, Malayalam, and Tamil, Dr Rehman ensures effective communication with a diverse patient population.

Patients seeking diagnostic services can trust Dr Rehman for his wealth of experience, exceptional skill set, and commitment to staying at the forefront of medical advancements. His current roles at prominent healthcare institutions, including Nuffield Health Brentwood Hospital, Spire London East Hospital, and Lyca Health Canary Wharf, underscore his reputation as a highly capable and experienced consultant radiologist. 

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Professor Keyoumars Ashkan is a leading neurosurgeon and one of the handful of neurosurgeons in London to be awarded a professorship. He practices at various top London clinics and hospitals including King's College Hospital, the London Neurosurgery Partnership, Harley Street Clinic, Cromwell Hospital and New Malden Diagnostic Centre. He has a special interest in functional neurosurgery; image-guided minimally invasive surgery; spine disease; and brain and spinal tumour surgery. He is actively involved in research, especially in developing new treatments for brain tumours and for Parkinson's disease. He is the UK Lead for the Genomics England programme for brain tumours; president of the British Society for Stereotactic and Functional Neurosurgery; chairman of the Neurosurgery Section of the International Parkinson and Movement Disorder Society, chair of King's Neuroscience Clinical Trial Unit; and deputy lead for King's Neuroscience Research & Innovation Committee. He has published over 350 peer review papers, abstracts and book chapters and is an associate editor and reviewer for several journals. He has been awarded numerous prestigious fellowships and prizes and plays an integral role in myriad professional bodies.

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