If the right and left ventrical of the heart are normal size, thickness and function, can the right ventrical still be dilated? echo shows "no hemody sig aortic stenosis and rvdd 3.5. but shows norma

Either or: The question got truncated, but you are right, the ventrical size can either be normal, increased ( dilated) or smaller than average range for the given age/sex.

No.: If the right ventricular size and function are normal, the right ventricle is not dilated.

Imaging: Imaging tests are an indirect way of evaluating the various organ systems. Some tests provide numeric values with an attached range of 'normal values'which are meant to be a guide to be used for the clinician when correlating the test findings with the patients complaints and examination findings. Numbers can be erroneous due to technical factors or irrelevant in a specific patient (eg body size).