We present high angular resolution imaging (23.9?×?11.3 mas, 138.6?×?65.5 pc) of the radio-loud quasar PSO?J352.4034?15.3373 at z?=?5.84 with the Very Long Baseline Array (VLBA) at 1.54 GHz. This quasar has the highest radio-to-optical flux density ratio at such a redshift, making it the radio-loudest source known to date at z?~?6. The VLBA observations presented here resolve this quasar into multiple components with an overall linear extent of 1.62 kpc (028) and with a total flux density of 6.57?±?0.38 mJy, which is about half of the emission measured at a much lower angular resolution. The morphology of the source is comparable with either a radio core with a one-sided jet or a compact or a medium-size symmetric object (CSO/MSO). If the source is a CSO/MSO, and assuming an advance speed of 0.2c, then the estimated kinematic age is ~104 years.
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