Present on an interesting case you came across, it may be an obscure pathology, a nice demonstration of classic pathology or something you didn't know but now you do.
Present on something you have learnt that may be of interest to others. It may be a tip or trick you were taught, an innovative idea, or a way you handled a challenging situation
Whether you have done an in-house audit or official research through a university, present on some of your key findings or what lead you to undertake this research.
Throughout the year you have likely had many university assignments, one of these may be just right to adapt into a presentation. Talk to your lecturers to check for suitability.