A woman rollerblading on the West Side yesterday was crushed by an MTA bus near the entrance to the Circle Line.

The 67-year-old victim was struck by the M42 as it turned into the West 43rd Street driveway at around 8:10 a.m., and her leg was stuck under a tire for 15 agonizing minutes.

“[The bus driver] didn’t see her because she came from between the trees, and she was going fast,” said Hosny Abdelaal, 56, who works for the parking facility at the pier. “I heard her screaming, ‘Ahh! Ahh!’ ”

Abdelaal said the woman fell face down, and that a bus wheel went over her left leg.

Passers-by did their best to comfort the badly injured woman until firefighters arrived. It was about 15 minutes before they extricated the woman from beneath the bus, Abdelaal said.

The woman was taken to Bellevue Hospital, where she was in stable condition last night. Her name was not released.