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Mother in law sign

Dr Andrew Dixon and Dr Frank Gaillard et al.

The mother in law sign is perhaps uncharitably (depends on the mother in law I suppose) used to describe lesions that enhance early during the arterial phase and remain opacified well after the venous phase. The joke is that a mother in law comes early and stays late.

It is most frequently equated with the angiographic appearance of a meningioma.