If the participant with unilateral PA tumor less than 4cm is willing to enter the clinical trial, he/she will be randomly assigned to two groups (conventional vs needlescopic laparoscopic adrenalectomy) in a 1:1 ratio, followed by preoperative assessement. All procedures were performed by experienced laparoscopic urologists (number of complex laparoscopic procedures > 50 cases/yr for 10 yrs). The participant were blinded to the type of surgical procedure underwent until the pain assessment was completed in the morning of the second days after surgery
The investigator conduct a randomized clinical trial for the needlescopic and conventional laparoscopic adrenalectomy to assess whether mini laparoscopic adrenalectomy is better than conventional laparoscopic adrenalectomy in terms of pain, complication rate , and wound cosmetics