<prompt> The cresecent forming forming glomerulonephritis is -RPGNAcute GNMembranous GNMembrano proliferative GN  <response>: Distinctive lesions of proliferation are called crescents owing to their shape as they fill Bowmans space. Crescents are formed both by the proliferation of parietal cells and by the migration of monocytesmacrophages into Bowmans space. The glomeruli show cellular proliferation outside the capillary loops, sometimes in association with segmental capillary necrosis, breaks in GBM, and deposition of fibrin in Bowmans space. Ref:- Robbins book of basic pathology 10th Ed. pg 532. 