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Paola Piccini, MD
MRC Cyclotron Unit Hammersmith Hospital DuCane Road London W12 ONN, England

Nicola Pavese, MD; Raffaello Canapicchi, MD; Claudio Paoli, MD; Paolo Del Dotto, MD; Michele Puglioli, MD; Giuseppe Rossi, BioSc; Ubaldo Bonuccelli, MD
Institute of Clinical Neurology University of Pisa Via Roma 67, 56100 Pisa, Italy

Arch Neurol. 1996;53(3):211-212.

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Quinn pointed out that the result of our study¹ could be influenced by selection bias of both control subjects and patients. In particular, he suggested that the increased frequency and extent of periventricular hyperintensities in patients with PD with accelerated disease progression could be due to performing magnetic resonance imaging more often in patients with atypical features. He also claimed that we do not specify how the "healthy" subjects have been selected for magnetic resonance imaging.

The control group included subjects referred to the Institute of Neurology of the Univeristy of Pisa, Pisa, Italy, over a period of 3 years. The subjects complained of neurologic symptoms not known to alter magnetic resonance imaging white matter characteristics. None of the subjects had a history of psychiatric or neurologic diseases, and none of them had cerebrovascular risk factors or cognitive deficits as scored by the Mini-Mental State Examination. Examples . . . [Full Text PDF of this Article]

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