75 yrs old woman present with post-myocardial infarction after 6 weeks with mild CHF. There was past H/O neck surgery for parathyroid adenoma 5 years ago, EKG shows slow atrial fibrillation. Serum Ca+2 13.0 mg/L and urinary Ca2+ is 300 mg/ 24 hr. On examination, there is small mass in the Para tracheal position behind the right clavicle. Appropriate management at this time is -