Peninsula Ultrasound Mammography and MRI They are knowledgeable in the following conditions / disorders: Thyroid Disorders. Peninsula Ultrasound Mammography and MRI is located on 101 S San Mateo Dr 201 201 in San Mateo. They can be reached by phone by calling (650) 343-1655 . They can be reached by calling (650) 343-1655 . They can perform the following procedures / treatments: Amniocentesis. They have not yet been reviewed on MojoPages.com.