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Yves Miaux, MD
Service de Neuroradiologie Charcot Groupe Hospitalier Pitié-Salpêtrière 47 Blvd de l'Hôpital 75651 Paris, Cedex 13, France

Arch Neurol. 1996;53(5):402.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

I read with great interest the article by Piccini et al¹ in the ARCHIVES They suggest that periventricular hyperintensities on proton density—weighted and T₂-weighted magnetic resonance images in patients with Parkinson's disease may represent a marker for a clinical subtype with severe disease. I would like to make some comments.

• In the figures, proton density—weighted and T₂-weighted magnetic resonance images are inverted. However, I think that this inversion is probably due to a typing error.

• In one of their patients (Figure 2), the proton density—weighted axial magnetic resonance image demonstrates mild periventricular hyperintensities and also a crescentic bilateral (predominating on the right) extracerebral lesion, with signal intensity different from that of cerebrospinal fluid.

Do these lesions represent subdural effusions or dural thickening? Are they also a possible marker for disease severity? The article by Piccini et al should be supplemented, with specific . . . [Full Text PDF of this Article]

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