Agarwal A, Oinam R, Goel V, Sharma P, Faruq M, Garg A, Srivastava AK. "Ear of the Lynx" Sign in Hereditary Spastic Paraparesis (HSP) 76.
Mov Disord Clin Pract 2023;
10:120-123. [PMID:
36704071 PMCID:
PMC9847285 DOI:
10.1002/mdc3.13606]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Revised: 10/13/2022] [Accepted: 10/17/2022] [Indexed: 11/06/2022] Open
Abstract
Background
Hereditary Spastic Paraparesis (HSP) are a group of genetically inherited disorders, clinically and genetically heterogenous and characterized by degeneration of corticospinal tracts, manifesting with progressive spasticity and lower limbs weakness. Most HSPs have an autosomal dominant inheritance. "Ear of the Lynx" sign describes the characteristic abnormality in the forceps minor region of the corpus callosum (CC) on MRI brain. These bear a striking resemblance to the ears of a lynx. This finding has previously been described with hereditary spastic paraparesis 11 and 15, both of which are autosomal recessive HSPs.
Cases
We describe this finding in two siblings with novel mutations causing HSP76, an extremely rare autosomal recessive HSP (less than 50 cases described worldwide), which has not been reported previously.
Conclusion
This sign suggests the presence of pathogenic genetic mutations and is likely indicative of autosomal recessive HSPs.
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