A stromal cell of the endometrium that is fibroblastic in appearance. During decidualization this cell may differentiate into a decidual stromal cell. [ http://www.ncbi.nlm.nih.gov/pubmed/30013421 https://doi.org/10.1038/s41591-020-1040-z http://www.ncbi.nlm.nih.gov/pubmed/11331626 http://www.ncbi.nlm.nih.gov/pubmed/30309298 Wiki:Decidualization&oldid=908981933#Endometrial_stromal_cells_(ESCs) ]