Police are appealing for public assistance to help locate missing teenager Ana Braz, who has links to the Doreen and South Morang areas.

The 14-year-old, who also goes by the names Ana Catarina and Cat, was last seen about 5.30pm on Friday (January 18) at Keilor Downs Railway Station.

Police and family members hold concerns for her welfare due to her age and the fact she has a medical condition.

An image of Ana has been released in the hope someone recognises her and can provide details on her whereabouts.

Ana is Caucasian in appearance and about 180cm tall with a solid build, brown eyes and pink shoulder-length hair.

It is possible she may be in the South Morang or Doreen areas.

Anyone who sees Ana or has information on her whereabouts is urged to contact Caroline Springs Police Station on 9361 4700.