extramedullary

adjective
ex·​tra·​med·​ul·​lary | \-ˈmed-ᵊl-ˌer-ē, -ˈmej-ə-ˌler-ē, -mə-ˈdəl-ə-rē \

Medical Definition of extramedullary 

1 : situated or occurring outside the spinal cord or the medulla oblongata

2 : located or taking place outside the bone marrow extramedullary hematopoiesis

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