Audacious goal for personal statement and open-mindedness


While drafting my personal statement, I am finding there is a fine line between talking about your goals and saying you have an affinity to certain areas/specialties in medicine. How do we present our audacious goal in our personal statement while still appearing open-minded to the prospect that our interests in certain areas of medicine will change?
One of my interests is in academic medicine. Is it considered okay to mention this interest in the personal statement or is this viewed the same as if you mentioned a medical specialty?

Thank you in advance for your time.