Diagnosis and treatment of Parkinson's disease

doi:10.1136/bmj.310.6995.1668

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Anosmia is a common finding

C M Hawkes

Head of neurological services Department of Clinical Neurology, Ipswich Hospital, Ipswich IP4 5PD

EDITOR,—Niall Quinn's review on the recognition and differential diagnosis of parkinsonism1 omits an important point—namely, that at least 70% of patients with idiopathic Parkinson's disease have a defective or absent sense of smell.2 3 About 90% of patients have rigidity and akinesia, and hence impairment of the …