Can I only have 4 pack abs?

Some people have less separation between the muscles of the abdominals.  Nothing really concerning about this.  Best, Dr. Emer.

Your question is a great question.  As one of the two authors of the original VASER Hi Def paper, I can tell you that everyone's anatomy is a little different.  Some patients have less definition, especially at the lowest two lines across the abdomen next to the umbilical area, therefore, your doctor was correct in marking out the anatomy that you do have, or that he can feel.  I have had many patients where I have only been able to find and/or mark a 4 pack.  I've even had a patient with a 7-pack, which I thought was quite unique (And, who knows maybe even lucky!).  The last thing you want a VASEr Hi Def surgeon to do is sculpt anatomy, you either don't have, or is underdeveloped enough, that it can't be sculpted.