The benign type is seen in benign lesions such as benign tumors and following trauma. An aggressive type is seen in malignant tumors, but also in benign lesions with aggressive behavior, such as infections and eosinophilic granuloma.
When setting up a Hookah air system, you will frequently need an array of metal fittings. For use around water, you should use stainless steel or brass fittings only. This is especially important when diving in salt water. Fittings made of ferrous metal will rust or corrode when used in, or near a water environment.
Step 9. Place the clay bowl on top of the hookah stem with the bowl gasket in between the hookah stem and the bowl. The clay bowl should fit snugly. Step 10. Light your coals. If you have instant lighting coals, you can light them with a lighter or match. Other coals will need a stove or a torch.