A small tortuous blood vessel shadow in the left trigeminal nerve root is a descriptive medical imaging diagnosis that suggests thickening or varicose blood vessels in the area, which may be the cause of primary trigeminal neuralgia. When an imaging report such as MRI suggests tortuous blood vessel shadows in the trigeminal nerve root, it suggests thickening or varicose blood vessels in the area. This may cause corresponding pathologic changes in the trigeminal nerve, resulting in symptoms of trigeminal neuralgia. This imaging diagnosis needs to be judged in conjunction with the patient’s specific situation. It is recommended to consult a neurologist or neurosurgeon for further management of this condition.