“Ears of the lynx” sign in hereditary spastic paraplegias is not always the same!

Hereditary spastic paraplegias (HSPs) are a heterogeneous group of genetic disorders featuring lower extremity spasticity and weakness. The "ears of the lynx" is a magnetic resonance imaging (MRI) sign that refers to degeneration of the forceps minor. Despite mimicking acquired conditions, like ependymitis granularis, it is considered a hallmark of some HSPs, such as types 15 and 11.[1] However, there were other types reported to have this sign,[2] [3] particularly when accompanied by atrophy of the anterior portion of the corpus callosum.