A Nine‐Year Diagnostic Odyssey of Refractory Psychiatric Symptoms Resolving After Resection of a CA19‐9‐Producing Ovarian Teratoma: A Case Report and Literature Review

Ovarian teratomas may be associated with suspected cases of isolated autoimmune psychosis, even in the absence of typical neurological signs or positive autoantibodies. In such instances, CA19-9 elevation could serve as a nonspecific clue. Comprehensive imaging remains crucial for patients with atypical, treatment-resistant psychosis to avoid diagnostic delays.