Sialuria

What it is

A rare disorder of sialic acid metabolism characterized by excretion of large quantities of free sialic acid (predominantly N-acetylneuraminic acid without any morphologic evidence of storage within any subcellular organelle), mildly coarse facial features and hepatosplenomegaly. Growth and development are rather normal, however some affected individuals were reported to have moderate developmental delay, slight motor delay and mild intellectual impairment. Additional clinical features may involve macrocephaly, mild small airway obstruction, frequent upper respiratory tract infections, transient failure to thrive, seizures and sleep apnea. Signs and symptoms can be transient, especially in infancy.

Key facts

Prevalence

<1 / 1 000 000

Age of onset

Infancy

Inheritance

Autosomal dominant

Classified as

Disease

Prevalence figures describe populations, not individuals, and are often estimates from a single study. Where the figure is an incidence or a birth prevalence, it says so.

Signs and symptoms

These ranges are how often a sign appears across everyone diagnosed, not a prediction for one person — most people have some of these and not others. Orphanet also records findings that are specifically absent in this disease; those are in the data but not listed here.

Gene

ICD-10 codes

ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.

Related health topics

Reached through the ICD-10 categories this disease is filed under, so these describe the broader group rather than this disease specifically.

Cross-references