Cyclic neutropenia

What it is

A rare primary immunodeficiency characterized by regular oscillations in blood neutrophil counts from normal or subnormal levels to severe neutropenia, usually with a cycle length of about 21 days. Symptoms during the neutropenic phase include fever, mouth ulcers, but also pneumonia, and peritonitis, among others. Mode of inheritance is autosomal dominant.

Key facts

Prevalence

1-9 / 1 000 000 (Europe)

Age of onset

All ages

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.

Cross-references