From experience and for general surgery - If you have a good operative pictures or radiology pictures - do Surgery - Images in Surgery submission; if no picture or if that is rejected, American Surgeon is the next best best (impact factor) general surgery journal that accepts case reports. Note than Annals of Surgery accepts rarely accepts case reports, but their last accepted case reports (and only one in the last ~5 years) was the first face transplant. The other top general surgery journals (e.g., JACR, JAMA Surgery, JSR) do not accept case reports. If it is a surgical subspecialty (e.g., surgical oncology, cardiothoracic, colorectal), I have no knowledge of their top journals or which ones accept case reports.
As suggested above google things like "impact factor surgery journal" or "impact factor (name of subspecialty) surgery journal"
Also, whatever journal you submit to, search and download some of their recently published case reports for examples, formatting and such. Also read the instructions to authors carefully.