As a child, I participated in a longitudinal study. That study led me to the field I'm in now, and I have the opportunity to potentially work with a dataset that has a high probability of containing my data from back then.
Since I happen to know my own gender, birthdate, and disease status, I could well identify myself if I got access.
Note that the PI that would be providing me access is not the PI whom I participated with.
Are there any issues with this? Or, are there any perceived issues that might worry someone involved? Do I have any obligation to disclose this?