The Norse dwarves are highly significant entities within Norse mythology. They are the makers of most of the artefacts of the gods, both Aesir and Vanir. Their dwelling places are two of the nine worlds upon the world-ash Yggdrasil, that of Nidavellir and of Svartalfheim.
They are known also as svartalfir, or "dark elves".
... Passage of kidney stones through the urethra can be painful and subsequently it can lead to urethral strictures[?]
Endoscopy of the bladder via the urethra is called ...