Small grainy lump in breast. hard and painful before period. ultrasound 2 times, they say normal tissue. is ultrasound accurate to tell it is normal?

Not always: The chances are your condition is secondary to fibrocystic condition. However any lump in the breast requires complete evaluation and work up to rule out a potential malignancy. Ultrasound is an excellent test but it is very dependable on the equipment used and the person performing and interpreting it. You need to have a clinical exam by a breast care provider and may need imaging studies.