Lil Wayne -- Trial In Jeopardy Over Seizures

Lil Wayne's medical emergency Thursday could derail his trial ... TMZ has learned.

Sources connected with the case tell us, Wayne was scheduled to testify Friday but just before noon Thursday the judge was informed the rapper had a seizure out of state and was going to the hospital. As a result, court was dark Friday.

Wayne is suing Quincy Jones III over a documentary QIII did on him, claiming it's a "scandalous portrayal." Wayne also alleges producers didn't have the right to use his music in the flick. (You'll recall the hilarious deposition tapes we posted.)

Our sources say they've been told it is "unlikely" Wanye will be able to testify on Monday and there is a "real chance" Wayne will not be witness ready for a significant period of time.

Here's the problem. The case is being heard by a jury, so it's unlikely the judge will grant a continuance because it would unduly disrupt the jurors' lives. There are 2 other options ... declare a mistrial, or force Wayne's side to present its case without him.

We're told lawyers for Wayne will inform the judge Monday morning on Wayne's status.

TMZ broke the story ... Wayne suffered what we're told were 2 seizures on a private plane Thursday and was hospitalized until Friday afternoon. Although a woman claiming to be Wayne's rep says it was just a combo of dehydration and a migraine, people repping Wayne in an official capacity tell us they were told he suffered 2 seizures, which is consistent with what the pilot radioed to ground control.