extramedullary

adjective

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

1

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

2

: located or taking place outside the bone marrow

extramedullary hematopoiesis