# Jansen's metaphyseal chondrodysplasia

> English word · Proper noun

## Definitions
1. A very rare disease resulting from ligand-independent activation of the type 1 parathyroid hormone receptor, leading to various physical abnormalities.

## Etymology
Named after Murk Jansen, who wrote about it in the 1930s.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/jansen-s-metaphyseal-chondrodysplasia