I suggest that you try the "Journal / Author Name Estimator" (JANE), online: http://jane.biosemantics.org
Copy/paste your abstract into the search box, and press "Find journals." You will receive a list of journals that have published articles with terms similar to those of your abstract. For each journal, you can click "Show articles," and you can see some of those articles.
The JANE web site is a very fast and simple way to find highly relevant journals. I recommend it.
There are several journals dedicated to publishing case reports or you can search major journals (on each speciality) if they also accept case reports.
Also, there are some online tools such as Journal Finder (from Elsevier https://journalfinder.elsevier.com/) or Journal Suggester (from Springer https://journalsuggester.springer.com/).