Dietary cholesterol is now suspected to be essentially irrelevant to health. We know this because, among other things, some people eat diets with 10-100x as much cholesterol as some other people, and they don't immediately develop heart disease.
Blood cholesterol, on the other hand, seems to be essentially a thing the body does while storing excess quantities of fat. The obese will usually have high blood cholesterol, the non-obese will usually not have high blood cholesterol... whether they're on a zero-fat zero-cholesterol diet or not.
So basically, they're two different things: Long-term, blood cholesterol is mostly created endogenously independent of diet, and dietary cholesterol does not convert to blood cholesterol.
Blood cholesterol, on the other hand, seems to be essentially a thing the body does while storing excess quantities of fat. The obese will usually have high blood cholesterol, the non-obese will usually not have high blood cholesterol... whether they're on a zero-fat zero-cholesterol diet or not.
So basically, they're two different things: Long-term, blood cholesterol is mostly created endogenously independent of diet, and dietary cholesterol does not convert to blood cholesterol.