The bracket sign refers to a radiographic appearance seen with the tubulonodular variety of pericallosal lipoma. It reflects calcification seen at the periphery of the midline lipoma. It is best seen on coronal imaging, and historically was identified on frontal radiographs.
- 1. Rao AS, Rao VR, Mandalam KR et-al. Corpus callosum lipoma with frontal encephalocele. Neuroradiology. 1990;32 (1): 50-2. - Pubmed citation