Wächterlymphknotenlokalisationsdiagnostik: diagnostic investigation in order to localize the sentinel lymph node. I reckon that German is the only language which produces such word monstrosities*. 41 characters in just one word. Wow!
Sentinel lymph nodes are the first first nodes reached by metastasizing cancer cells from a primary tumor. The lymphatic fluid is an easy and convenient way for metastases to spread to other regions. If the very first regional lymph node, the sentinel, is free of cancer cells, then it is highly improbable that the cancer has spread to any other area of the body.
A low-activity radioactive substance (Technetium-99m) is injected near the tumor, then a lymphoscintigraphy is performed.
[Source of the word: Strahlenschutzanweisung eines Klinikums]
* The only language except for Welsh. Need a proof?
This is the incredibly unpronounceable name of a village on the island of Anglesey in Wales.
The name means: [St] Mary’s Church (Llanfair) [in] the hollow (pwll) of the white hazel (gwyngyll) near (goger) the rapid whirlpool (y chwyrndrobwll) [and] the church of [St] Tysilio(llantysilio) with a red cave ([a]g ogo goch). [Source]