20/01/2017 7:04 AM AEDT | Updated 20/01/2017 7:19 AM AEDT

Woman Critically Injured After Lane Cove Balcony Fall

A man is assisting police with their investigation.

Channel Nine / Twitter
The apartment block where the accident happened.

A 26-year-old woman is fighting for life in Sydney's Royal North Shore Hospital after falling from a second-story apartment in Lane Cove.

A NSW Police spokesperson told The Sydney Morning Herald a man was assisting police with their enquiries.

The incident happened after 11pm on Thursday and authorities were alerted by a neighbour in the apartment complex who heard a woman scream.

The woman fell onto a concrete surface and suffered critical head injuries.