Reposting to add this article by Eugene Volokh for a detailed look at pseudonymous litigation.
While he notes that case law on this isn't settled, his appendices list way more cases where it was granted for SA victims than cases where it wasn't
papers.ssrn.com
The Law of Pseudonymous Litigation
When may parties in American civil cases proceed pseudonymously? The answer turns out to be deeply unsettled. This Article aims to lay out the legal rules (such