ArticleJournal of neuro-oncology2025
The Mickey Mouse's hand sign in brain MRI points out multinodular and vacuolating neuronal tumors in mesial temporal lobe structures.
Article in Journal of neuro-oncology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
purposeMultinodular and vacuolating neuronal tumor (MVNT) is a rarely diagnosed neoplastic lesion often associated with adult-onset focal seizures. In some situations, atypical MRI features of MVNT may mimic other long-term epilepsy associated tumors (LEATs) or diffuse low-grade gliomas. In such a context, the identification of distinct clinical markers is recommended.
methodsWe retrospectively analyzed the neuroimaging features of histologically confirmed MVNT lesions of our epilepsy surgery cohort. All the identified MVNT patients had a mesial temporal lobe location. The MRI features from the MVNT population were compared to those from non-MVNT lesions randomly selected in our cohort. Non-MVNT lesions consisted of (i) other tumoral lesions belonging to LEATs group, (ii) infiltrative tumoral lesions such as grade 2, IDH-mutant Gliomas, and (iii) non-tumoral, highly epileptogenic lesions, such as hippocampal sclerosis.
resultsMRI analysis of patients with MVNT noticed an unusual FLAIR hyperintense signal extending from the uncus to the anterior white commissure through the sublenticular region. This neuroimaging abnormality visually mimicked "Mickey Mouse's hand" on coronal plane. The "Mickey Mouse's hand" sign was identified in 6 patients out of 9 (66.7%) MVNT patients. We did not identify the Mickey Mouse's hand sign in other control lesions (0/11 ganglioglioma, 0/11 glioma, 0/150 hippocampal sclerosis), except in one patient with dysembryoplastic neuroepithelial tumors (DNET) (1/15; 6.7%). All patients showing the "Mickey Mouse's hand" sign were seizure-free after surgery.
conclusionsThe Mickey Mouse's hand sign represents a straightforward and easy-to-remember neuroimaging feature, that does not require advanced MRI sequences and that could help clinicians facing mesial temporal lesions to rapidly raise the suspicion of MVNT diagnosis.
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