A patient at the Hospital for Special Surgery on Manhattan's upper East Side was slightly cut Friday by flying glass when a window in her room shattered, possibly from a bullet, officials said.

The incident occurred at about 5:30 a.m. when a north-facing window on the eight floor of the hospital at 535 East 70th St. was hit, sending pieces of glass into the patient's room, said police and hospital officials.

A spokesman for the NYPD said police recovered what appeared to be part of a spent firearm round from between the double-paned window and were conducting an investigation to determine if it is in fact a bullet and where it may have been fired from.

The hospital said in a statement released late Friday that it was helping police with the investigation and that the facility was operating normally and adhering to its medical schedule.

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The patient, who was only described by police as a 30 year-old woman, was treated for small cuts from glass shards and was in stable condition, said the NYPD.

The hospital is located in a building between the FDR Drive and York Avenue. The facility is adjacent to a number of tall structures which comprise the New York-Presbyterian/Weill Cornell Medical Center.