Miguel's Leg Drop Victim -- Possible Brain Damage

The girl who took Miguel's leg drop to the head at the Billboard Music Awards may have suffered brain damage ... the victim's lawyer tells TMZ.

As you'll recall ... Miguel took a flying, theatrical leap across the stage and landed with thunderous force on Khyati Shah's head.

Vip Bhola, Shah's lawyer, says, "Some of the difficulties she's experiencing are cognitive in nature and lead to suspicion of a neurological head injury."

Bhola says BMA responded to the accident with a pathetic gesture -- an ice pack designed to soothe a bruised elbow. The attorney insists his client should have been rushed to the hospital.

Bhola tells us his client is waiting for test results from a neurologist. When the results are in -- sometime next week -- Khyati will decide if a lawsuit is in the cards.