Indication for surgery in a case of adrenal incidentaloma is

Any non-functioning adrenal tumour greater than 4 cm in diameter and smaller tumours that increase in size over time should undergo surgical resection. Non-functioning tumours smaller than 4 cm should be followed-up after 6, 12 and 24 months by imaging (MRI) and hormonal evaluationRef: Bailey and Love 27e pg: 840