Sandbox: Kaposi

Clincal Stage	Histologic Features
Macular stage	Thin-walled, angulated vessels throughout dermis, with hemosiderin and plasma cell infiltrate
Patch stage	Angulated lumina that dissect dermal collagen Vessels may proliferate around well-developed round venules (premonitory sign) Angiomatoid vascular spaces with red blood cells are surrounded by spindle cells in short fascicles
Tumor stage	Solid nodules with extensive spindle cells and red blood cells in slit-like lumina No/rare mitotic activity or atypia
Lymphangioma-like variant	Thin, angulated vessels with no red blood cells