What could breast lump that does not show on a mammogram or a sonagram be?

Breast lumps: That have no correlate on mammogram or ultrasound are typically normal breast tissue that feels lumpy.

May need 2 C surgeon: Infrequently some cancers are only felt and not seen on mammogram or ultrasound. I would see a breast specialist who can help determine if the lump is suspicious. He/she may recommend biopsy or an additional test such as an mri. One particular lesion (known as lobular carcinoma) is notorious for being invisible on mammo and us. However, i would say the majority of lesions only felt are benign.

Lump: Usually if mammo and ultrasound are normal it turns out to be nothing of concern. However, a small percentage of breast cancers are found only on physical exam, so depending on the physical findings and your doctors level of suspicion, further evaluation may be needed.