Short answer · Medically reviewed summary · Last updated: 2026-05-08
Sly syndrome, formally known as Mucopolysaccharidosis type VII (MPS VII), is a rare lysosomal storage disorder caused by a deficiency of the enzyme beta-glucuronidase. It is most commonly referred to in medical literature as MPS VII, while the name Sly syndrome honors Dr.
Sly syndrome, formally known as Mucopolysaccharidosis type VII (MPS VII), is a rare lysosomal storage disorder caused by a deficiency of the enzyme beta-glucuronidase. It is most commonly referred to in medical literature as MPS VII, while the name Sly syndrome honors Dr. William Sly, who first described the condition in 1973.
In clinical practice, the most accurate and preferred term is Mucopolysaccharidosis type VII (MPS VII). While Sly syndrome is widely recognized in medical textbooks and patient communities, the classification system relies on the specific enzyme deficiency involved. Because the condition is a spectrum disorder, you may encounter various labels across different medical records and international databases.
Medical terminology often evolves as our understanding of a disease's genetic and biochemical basis improves. Sly syndrome was named after the physician who identified the clinical presentation in 1973. However, international classification systems prefer descriptive names based on the underlying pathology to ensure global consistency. The following list outlines the primary identifiers for the condition:
Major international health systems categorize Sly syndrome under specific unique identifiers to assist in research and patient care. Under the Online Mendelian Inheritance in Man (OMIM) database, it is cataloged as #253220. In the Orphanet database, it is identified by the ORPHA code 582, which provides a centralized resource for rare disease information. These codes are essential for patients when communicating with specialists or insurance providers to ensure they are referencing the correct clinical entity.
Medical disclaimer: This information is for educational purposes only and does not constitute medical advice, diagnosis, or treatment; always seek the advice of a qualified physician with any questions regarding a medical condition.