Which syndrome results from ventral pontine lesions causing contralateral hemiparesis and mute with dysphagia?

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The situation described arises from a ventral pontine lesion that disrupts the corticospinal and corticobulbar pathways on both sides. When these motor tracts are bilaterally damaged, almost all voluntary movement is lost, including the muscles used for speech and swallowing, while the patient remains conscious and alert. This combination—quadriplegia with anarthria (inability to speak) but preserved awareness—is classic Locked-In syndrome. Patients typically retain vertical eye movements and blinking, which they use to communicate.

This differs from other brainstem syndromes: Weber's involves a midbrain lesion with ipsilateral oculomotor palsy and contralateral hemiparesis, not a complete bulbar paralysis with preserved consciousness. Top-of-basilar syndrome can produce profound brainstem and cortical signs with impaired consciousness, but its hallmark is different patterns of gaze and arousal. Thalamic syndrome centers on sensory disturbances and pain, not the pure motor paralysis and muteness seen in Locked-In.