Ossification evident 2-8 months following swelling [MISCELLANEOUS] Trauma, IM injection, surgery can be foci of ectopic ossification [MISCELLANEOUS] Caused by mutation in the activin A receptor, type I gene (ACVR1, 102576.0001) [MOLECULAR BASIS] Mean age of onset, 5 years [MISCELLANEOUS] De novo mutation (in most patients) [MISCELLANEOUS]
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