Not To Mention Meaning

(idiomatic) Used by the speaker to mention another important point; an apophasis.

Example: 2012, Christoper Zara, Tortured Artists: From Picasso and Monroe to Warhol and Winehouse, the Twisted Secrets of the World's Most Creative Minds, part 1, chapter 2, page 51:
  In fact, the immortal tunemeister Irving Berlin wrote all three [songs], along with about 1,500 others, not to mention the scores for eighteen Hollywood films and nineteen Broadway musicals.
2013 June 1, “A better waterworks”[1], The Economist, volume 407, number 8838, page 5 (Technology Quarterly):
  An artificial kidney these days still means a refrigerator-sized dialysis machine. Such devices mimic […] real kidneys […] . But they are nothing like as efficient, and can cause bleeding, clotting and infection—not to mention inconvenience for patients, who typically need to be hooked up to one three times a week for hours at a time.
  The city was already having staffing difficulties, not to mention having a three million dollar budget shortfall.‎