Hypertension from Renal disease is different from the usual hypertension caused by stress because in renal hypertension, the cause is because of a defect or a disease in the Renal system while the other is caused by stress.

Secondary hyptertension is caused by some other medical problem, such as a kidney disorder or endocrine disorder.

A renal scan with lasik is a mis spelling of a renal scan with lasix, a diuretic, used to increase renal function.

Primary Hypertension is the cause of unknown

This is WRONG! I took a test and I used this answer and I got it wrong.

Primary in medical terms often means not due to another condition. For instance, primary hypertension doesn't have another cause. Secondary hypertension might be caused by problems with the renal arteries or due to medication.