Thanks mr skeltallordofhell skeleton-channelAdjust content blockingContent Blocking prevnext Prev Next Fibrodysplasia ossificans progressiva is a disorder in which muscle tissue and connective tissue such as tendons and ligaments are gradually replaced by bone (ossified), forming bone outside the skeleton extra-skeletal. prevnextTags: funny | shit | guys +622 -Favorite +Favorite Unblock User's Content Block User's Content Sub/Block Channels skeleton-channel:UploadUnblockBlockSubUnsubsubs: 109