Q: Case report publication followed by a case series

Detailed Question -

I came across an interesting case which I submitted for publication in a non-pubmed indexed local journal. Now I came across multiple similar cases and I would like to submit them for a case series, is that possible/ethical? Given that the initial publication was in a local journal, is it okay to use some of the discussion from that one due to the similarity of the cases or does the discussion have to be from different sources?

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