A California mother lost her arm after being struck by a falling palm tree at a mini golf course during a celebration for her son's birthday.

Adela Magaña, 53, was left in agony following the ordeal at Golf N' Stuff's course in Ventura, a coastal city roughly 70 miles northwest of Los Angeles.

She was sitting on a bench as her husband and children began to play their third hole when a 40-foot palm tree fell on top of her, The Ventura County Star reports.

Her husband Amando and 22-year-old son Junior dashed over to help her after hearing a 'screeching sound' and a 'big old thump' during their game on August 6.

Amando, Junior and two Good Samaritans lifted the tree off of Adela, only to discover her mangled arm was gushing with blood.