Craniotomy nov '11 meningioma, small residual tumor left. Hard lump in neck afterwards. U/s indicates hypoechoic nodule. Tsh norm. Concern warranted?

Yes. While this is unlikely to be related to your meningioma, it should be further evaluated. If this is in your thyroid it could well be an adenoma, but without a biopsy of some type you will not know!
Possibly. It is most unlikely it is a meningioma. However, i assume you are female, and women with thyroid nodules should have additional evaluation (fine needle aspiration of the thyroid or neck nodule) since they do have a higher incidence of thyroid disease than men. No matter the gender, this needs to have additional evaluation.