Sandbox: Kaposi

Clincal Stage	Histologic Features
Macular stage	Thin vessel wall Angulated vessels throughout dermis Plasma cell and hemosiderin infiltrates
Patch stage	Angulated lumina that dissect dermal collagen Premonitory sign Spindle cells surround angiomatoid vascular spaces filled with RBC
Tumor stage	Solid nodules The presence of spindle cells and red blood cells in a slit-like lumina Abscence of cellular atypia or mitotic activity
Lymphangioma-like variant	Thin walled, angulated vessels Absence of red blood cells