Thyroglobulin measurements in washout of fine needle aspirates in cervical lymph node

[Andros]

Thyroglobulin measurements in washout of fine needle aspirates in cervical lymph nodes for detection of papillary thyroid cancer metastases.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0004-27302010000600007

[Octavia]

Wow...this one lost me at "hello." Too bad they couldn't use a few more abbreviations throughout!

I guess this pretty much sums it up:
CONCLUSION: The results show that evaluation of FNAB-Tg in cervical LN is a valuable diagnostic tool for PTC metastases that can be used independent of the thyroid status.

...and in plain English... actually, I'm still not sure! The word "washout" is throwing me for a loop here.