Y sign (epidural lipomatosis)

Last revised by Mostafa El-Feky on 9 May 2023

The Y sign refers to a common appearance in lumbar epidural lipomatosis where excess fat in the extradural space compresses the dural sac into the shape of the letter "Y".

NB: Y sign also refers to the appearance of incudomalleolar disarticulation on CT, more commonly known to radiologists as the broken heart sign.

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Cases and figures

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