A useful site I heard about recently is Practicing Spanish, which focuses on medical Spanish for healthcare providers. It includes daily dialogues, with audio, useful phrases for different medical situations, anatomical terminology, basic vocabulary, notes on culture and information about Spanish-speaking countries, as well as a number of folk songs. The author of the site is a Spanish teacher in the USA with training in medical interpreting.
A similar site I found today contains a glossary of medical terms in nine European languages (Danish, Dutch, English, French, German, Italian, Portuguese and Spanish).
There’s another mutilingual medical dictionary at: http://www.super55.com.