Spondyloepiphyseal dysplasia tarda, Kohn type

What it is

A rare spondyloepiphyseal dysplasia and spondyloepimetaphyseal dysplasia characterized by short trunk dwarfism, progressive involvement of the spine and epiphyses and mild-to-moderate intellectual deficiency. Typical radiographic features include platyspondyly, abnormal lumbar vertebral bodies with anterior tongue-like protrusions, and the presence of degenerative large joint changes in the shoulder, hip and knee joints manifesting as narrowing of the joint spaces and irregularities of the articulate surfaces. Dens epistropheus may be absent. There have been no further descriptions in the literature since 1987.

Key facts

Prevalence

<1 / 1 000 000

Age of onset

Childhood

Inheritance

Autosomal recessive

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.

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