Periwinkle sign (supratentorial ependymoma)

The periwinkle sign has been coined to describe what has been claimed to be a characteristic appearance of intraparenchymal supratentorial ependymomas on non-enhanced CT axial images.

The central solid component with centripetal calcification surrounding central necrotic area resembles a flower. More fanciful still, the often present surrounding peripheral cyst has been likened to a leaf .

Etymology

For reasons that are not immediately apparent a particular flower, the periwinkle, also known as myrtle herb (Vinca minor) is chosen, although in fairness many flowers would appear similar.