Synonyms: Hunter syndrome | Iduronate 2-sulfatase deficiency | MPS2 | MPSII | Mucopolysaccharidosis type II
A lysosomal storage disease with multisystemic involvement leading to a massive accumulation of glycosaminoglycans and a wide variety of symptoms including distinctive coarse facial features short stature cardio-respiratory involvement and skeletal abnormalities. It manifests as a continuum varying from a severe form with neurodegeneration to an attenuated form without neuronal involvement.
Data from Orphanet are used to provide information on a disease's name, synonym(s), and overview. Reference: Access aggregated data from Orphanet at Orphadata. Orphadata: Free access data from Orphanet. © INSERM 1999. Available on http://www.orphadata.org. Data version April 2026
Newly diagnosed with
Mucopolysaccharidosis type 2?
Our RARE Concierge Services Guides are available to assist you by providing information, resources and connections as you navigate your rare disease journey.
Advocacy Organizations
Canadian Society for Mucopolysaccharide & Related Diseases Inc.
The Canadian MPS Society is a charitable organization dedicated to supporting individuals and families affected by mucopolysaccharidoses (MPS) and related lysosomal storage disorders. We are helping families live their best lives.
Child And Youth Care
To ensure every rare disease patient has access to quality and affordable care, treatment services in order to reduce morbidity and mortality.
Childhood Dementia Initiative
Our vision is for sustainable global health solutions for childhood dementia. This will be achieved through the following outcomes: - Treatments and cures available for children with dementia - Access to equitable and quality care for children with dementia and their families - Childhood dementia is a global health policy priority.
Emory Lysosomal Storage Disease Center
The Emory Lysosomal and Peroxisomal Storage Disease Center is devoted to remaining on the cutting edge of research and treatment providing comprehensive and compassionate care for all of our patients affected by lysosomal storage diseases.
Genetic Support Network of Victoria
The Genetic Support Network of Victoria is an organisation that supports people living with genetic, undiagnosed and rare conditions and those who support them including community and families, patient support organisations, health professionals and industry. Our vision is our community flourishing and living their best lives.
HeartCharged
Ending preventable deaths from undiagnosed heart conditions and sudden cardiac arrest, especially in young people, and providing patient-to-patient support.
Hypertrophic Cardiomyopathy Association
Providing support, advocacy, and education to patients, families, the medical community, and the public about hypertrophic cardiomyopathy and all thick heart muscle disorders, while supporting research and fostering the development of treatments.
Louisiana Metabolic Disorders Coalition
We support, educate, and advocate for patients & families affected by metabolic disorders.
Lysosomal Storage Disorders Society – Pakistan
LSD Society Pakistan is a registered Non-Profit organization set up by a group of parents dedicated and committed to improve the lives of Lysosomal Storage Disease patients in Pakistan by advocating for patients’ rights and creating awareness in general public. The objective of LSD Society is to advocate with the government and other stakeholders to establish a sustainable healthcare system
Lysosomal Storage Disorders Support Society
LSDSS endeavors to transform the life of children affected by rare Lysosomal Storage Disorders. Our mission is to increase awareness about the prevention of such disorders in future offspring as well as counsel the affected patients and families on how to cope with existing conditions, ensuring no patient or family living with an LSD ever feels alone.
MPS Society
The MPS Society supports families through difficult times and helps people living with rare diseases to live their lives to the full. Founded in 1982 and led by people directly affected by these diseases, we are the only registered charity in the UK which focusses on MPS (Mucopolysaccharide), Fabry and related conditions, a group of 27 rare, life-limiting genetic diseases.
MPS SuperHero Foundation
The MPS SuperHero Foundation is a non-profit organization dedicated to raising awareness and supporting efforts to find a cure for Mucopolysaccharidosis (MPS), In addition to raising awareness, we are committed to educating healthcare providers to enhance their understanding of MPS, we also provide emotional and financial support to families affected by MPS.
Mississippi Metabolics Foundation
Our mission at Mississippi Metabolics Foundation (MMF) is to advocate, educate, and support families in MS affected by genetic metabolic disorders/inborn errors of metabolism (IEM's). MMF promotes initiatives and further advancements in legislation, education, research, clinical trials, studies, therapies, targeted treatments, and eventual cures for IEM’s and all rare diseases.
My Rare Universe Foundation
Provide support to rare disease patients by promoting education, donations, clinical trials, patient registries, and genetic testing for accurate diagnosis. Raise awareness and recognition of the physical, mental, financial and social challenges faced by rare disease patients.
Orphan Disease Center
The Orphan Disease Center will develop transformative therapies using platform technologies that can be deployed across multiple rare diseases. We will emphasize disorders with substantial unmet need independent of their incidence and will strive to assure access to patients of all populations.
Pompe Alliance
To provide supportive services, education and information to patients, caregivers, medical professionals and community stakeholders.
Project Alive
Project Alive exists to find and fund a cure for Hunter Syndrome (also known as Mucopolysaccharidosis or MPS II) through research and advocacy. Project Alive is a powerful voice for children and adults with Hunter Syndrome, bringing together families and advocates with researchers, industry, and regulators. The organization funds promising curative research, assists researchers and industry with designing research studies for our community, and advocates for the most effective and efficient system of clinical research, evaluation, and approval. Through its innovative campaigns and grassroots efforts, Project Alive has made significant advances in public awareness about Hunter Syndrome and its symptoms, the need for early diagnosis, and available treatments and clinical trials.
RareDNA Foundation
Dedicated to improving outcomes for individuals and families affected by rare DNA heart mutations by advancing awareness, access and action. We increase awareness among medical professionals and the public, provide education and resources on diagnosis and treatment, support scientific research, and advocate for faster diagnostic pathways, giving families the knowledge and care they need.
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Clinical Trials
For a list of clinical trials in this disease area, please click here.