title: Clinical features of central isolated unilateral foot drop: A case report and review of the literature.
abstract: BACKGROUND
  Intracranial cause of isolated unilateral foot drop is very rare. There may be a delay in the diagnosis of the cause of central foot drop or patients with such lesions might be misdiagnosed and subjected to unnecessary interventions. One of the reasons for the diagnostic uncertainty might be the absence of upper motor neuron (UMN) signs in the initial examination of such patients.
  
  
  METHODS
  We present a very rare case of a 78-year-old woman who had presented with a five-year progressive right-sided unilateral isolated foot drop from a left-sided parasagittal tumor. Previously, she had undergone biopsy of an abnormality on the right C7/T1 facet, which was found to be benign. On examination of the patient, she had UMN signs in the ipsilateral foot. On magnetic resonance imaging scan of her head, a 3-cm left parasagittal lesion, consistent with it being a meningioma, was noted. The patient had significant medical history and declined to undergo surgical removal of the lesion.
  
  
  CONCLUSIONS
  We review the literature on central foot drop from various intracranial pathologies and discern its clinical features. Patients with central foot drop often have UMN signs; however, these may be absent causing diagnostic uncertainty, and physicians should be vigilant of these variations in the presentation.
authors.affiliation: Department of Neurosurgery, Wessex Neurological Centre, Southampton General Hospital, Tremona Road, Southampton SO16 6YD, United Kingdom.
authors.forename: Ganesalingam
authors.initials: G
authors.lastname: Narenthiran
authors.forename: Paul
authors.initials: P
authors.lastname: Leach
authors.forename: Jeremy P
authors.initials: JP
authors.lastname: Holland