Ct scan showed punctate area of hypoenhancement and decreased attenuation on axial image 15 measures less than 0.3 cm in size it is too small to definitively characterize. ultrasound showed normal liver blood flow etc. should i worry ?

We may answer you better if you let use know what your condition is and why you have those tests done. Because of liability, radiologists sometimes point out something they see but they cannot explain and most of the time the doctors who order the test do not concern about it and I have the same feeling. This is one of the reasons we sometimes do not want patients have access to the study results.