I have found on the web some Polish-language medical articles about SCT (potworniaki okolicy krzyżowo-guzicznej) that have free full text. Although I do not know Polish, from what I can understand of these articles they appear to be high quality.
The URLs to PubMed are here:
http://pl.wikipedia.org/wiki/Dyskusja:Potworniak_okolicy_krzy%C5%BCowo-guzicznej
PubMed has links to the PDFs.
Najlepsze życzenia,
Una