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We report on a patient with injury of the cortico-ponto-cerebellar tract (CPCT) following mild traumatic brain injury (TBI), diagnosed by diffusion tensor tractography (DTT).A 53-year-old female patient was injured in a car crash. While under treatment at a local medical center for headache, mild motor weakness, and cognitive impairment that developed following the car crash, she fell, hitting her head on the ground, about six weeks after the car crash.Approximately three months after the car crash, she began to show tremor on both hands and mild truncal ataxia. Twenty months after the car crash, when she underwent neurological evaluation at the rehabilitation department of a university hospital, she presented with mild resting and intentional tremor on both hands, and mild truncal ataxia.N/A.On 20-month DTT, the left CPCT showed tearing at the level of the subcortical white matter and pons, and discontinuation at the cerebellar portion. However, the integrity of the DRTT was well-preserved in both hemispheres.Using DTT, injury of the CPCT was demonstrated in a patient with ataxia and tremor following mild TBI.