Figure 1.

A drawing showing the three types of angiogenesis have been described in tumor growth: (A) sprouting angiogenesis, (B) intussusceptive microvascular growth (IMG), and (C) glomeruloid vascular proliferation. Sprouting angiogenesis involves formation and outgrowth of sprouts; IMG involves the formation of new vasculature where a pre-existing vessel splits in two; in glomeruloid vascular proliferation small glomeruloid bodies, so-called for their morphological resemblance with the renal glomeruli, are recognizable.