Verizon IndyCar Series driver Sage Karam left hospital on Monday afternoon after being kept in overnight for observation and evaluation of his condition following a major accident in Sunday's ABC Supply 500 at Pocono Raceway.

Karam lost control of the Chip Ganassi Racing #8 car with 21 laps remaining in the race, and spun into a brutal impact with the outside wall at turn 1.

"We had a really great race car and I felt comfortable and in a position to be in striking distance for the win," said Karam on Monday.

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"The car just unfortunately came around on me in the middle of turn 1 and I had no indication it was about to go."

It was Karam's accident that produced the shower of debris that then caught out Justin Wilson, who was following him through the corner and who was unable to avoid a large piece of bodywork from impacting the cockpit area of the Andretti Autosport car.

Karam himself was able to climb from his own car, but he then had to sit on the side of the monocoque until the ambulance arrived to take him to the in-field care centre. The 20-year-old appeared winded and bruised as he walked stiffly under his own power to the waiting vehicle.

The on-site medical team subsequently took the decision to transfer Karam to a local hospital for more tests and evaluation. While Wilson was airlifted to Lehigh Valley Hospital Cedar Crest in Allentown, Pa. via the medical helicopter, Karam was dispatched by ground transport to the same facility.

Of particular concern for Karam were bruising to his right heel and left wrist. However, according to IndyCar's medical consultant Dr Terry Trammell, CT scans undertaken at the hospital revealed no broken bones.

Karam was kept in overnight but discharged on Monday evening to return home to nearly Nazareth, Pa. to rest and recuperate.

Dr Trammel noted that Karam had not at this point been cleared to drive and would need to be re-evaluated before permission would be forthcoming.

In any case, Karam is not due to drive in the next Verizon IndyCar Series event, the season finale this weekend at Sonoma Raceway in California. The plan had always been for Sebastian Saavedra to take over the seat of the #8 for the GoPro Grand Prix of Sonoma on Sunday afternoon.

Meanwhile, Wilson remains in intensive care at Lehigh Valley where he is described as being in a critical condition and in a coma having sustained severe head trauma in the accident.

"I just hope everything is OK with Justin Wilson," Karam said. "Justin is the priority and everything else is secondary at this point."