Glomerular basement membrane electron dense deposits Subepithelial glomerular basement membrane electron dense deposits 2021-01-10T14:16:42Z Prominent glomerular basement membrane (GBM) reflecting a diffuse and relativly uniform increase in thickness (subjective estimate) with exogenous material deposited between the outer (epithelial) aspect of the GBM and the visceral epithelial cell, with varying degrees of incorporation into the GBM.