Unless you were a pathologist in the old country, youre perspective and even interest in a field would only be laughed or seen with a very skeptical eye by those who have been doing it for anywhere between 1-50 years. Remember, you're about 5 years out from any real experience in the field.
As someone who advises on these statements for compensation, I've staked my reputation on pushing people away from going all in on a speciality in their personal statement. It really isn't the point of the statement...
What about your personal motivations and characteristics, you diverse clinical and research exepriences, insights into why you are pursuing this path. If the frozen section is a metaphorical explantation for all this... then sure, but even then, it should just be a figurative device and not actually a point of discussion. Guess what I'm saying is that you're going to end up detracting from an exploration of your qualities by talking about a specialty.