=====Mesenchymal=====
The part of the embryonic mesoderm, consisting of loosely packed, unspecialized cells set in a gelatinous ground substance, from which connective tissue, bone, cartilage, and the circulatory and lymphatic systems develop.

[[Primary intracranial leiomyoma]] is an extremely rare occurrence of a low-grade [[mesenchymal]] tumor characterized by a proliferation of [[smooth muscle]] cells.