Metachondromatosis, also known as metcds, is related to exostoses, multiple, type i and hereditary multiple osteochondromas. An important gene associated with Metachondromatosis is PTPN11 (Protein Tyrosine Phosphatase Non-Receptor Type 11), and among its related pathways/superpathways are ERK Signaling and Nervous system development. Affiliated tissues include bone and heart, and related phenotypes are avascular necrosis and cranial nerve paralysis