Nifty witnessed a volatile session, after gap down opening panic selling pressure has been seen. However, it recovered more than 50 points from day's low in closing session to close 0.32 per cent lower at 18,089.85 level. S&P BSE Sensex also dropped 161 points and closed at 61,193 level. Nifty Midcap 100 and Nifty Small cap 100 traded strong and outperformed the benchmark indices for the day to close around 0.26 per cent higher and 0.07 per cent nearly flat respectively.