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The Monocle Sign in FDG-PET: A Sign of Contralateral Facial Nerve Palsy


Orita, Erika; Meerwein, Christian M; Pizzuto, Daniele A; Stolzmann, Paul; Huellner, Martin W (2020). The Monocle Sign in FDG-PET: A Sign of Contralateral Facial Nerve Palsy. Clinical Nuclear Medicine, 45(2):e94-e95.

Abstract

We report three cases of unilateral F-FDG uptake in the orbicularis oculi muscle in subjects with contralateral peripheral facial nerve palsy. We argue that this asymmetric uptake pattern in fact reflects lack of metabolism on the side affected by facial nerve palsy, owing to denervation. Since the unilateral periorbital uptake resembles a monocle, we chose to call this finding the monocle sign. The monocle sign should not be confused with inflammation or tumor, but should prompt a neurological assessment for facial nerve palsy and a potential underlying disease.

Abstract

We report three cases of unilateral F-FDG uptake in the orbicularis oculi muscle in subjects with contralateral peripheral facial nerve palsy. We argue that this asymmetric uptake pattern in fact reflects lack of metabolism on the side affected by facial nerve palsy, owing to denervation. Since the unilateral periorbital uptake resembles a monocle, we chose to call this finding the monocle sign. The monocle sign should not be confused with inflammation or tumor, but should prompt a neurological assessment for facial nerve palsy and a potential underlying disease.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Clinic for Nuclear Medicine
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:February 2020
Deposited On:20 Feb 2020 10:50
Last Modified:20 Feb 2020 10:51
Publisher:Lippincott Williams & Wilkins
ISSN:0363-9762
OA Status:Closed
Publisher DOI:https://doi.org/10.1097/RLU.0000000000002787
PubMed ID:31693602

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Embargo till: 2021-02-01