West Brom slipped nearer the relegation trapdoor despite an own goal from Danny Shittu which earned them a 1-1 draw with Bolton.
Matt Taylor's second half goal - his eighth of the season - looked to have earned Bolton a first away win in four months.
But with eight minutes remaining Shittu deflected a low Robert Koren drive past Jussi Jaaskelainen for the equaliser.
Megson was sent from the dugout in injury-time after exchanging words with referee Howard Webb following the substitution of Johan Elmander by Ebi Smolarek.
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