The increased use of thyroid fine needle aspiration(FNA) has re-focused on $H"{u}rthle$ cell lesions. The cytologic diagnosis of $H"{u}rthle$ cell tumor is a challenge due to the presence of $H"{u}rthle$ cells in non-neoplastic lesions and the inability to differentiate between benign and malignant $H"{u}rthle$ cell tumor. We report a case of $H"{u}rthle$ cell adenoma(HCA) un a 68-year old woman, with review of the cytopathologic findings. FNA revealed loosely cohesive or sheets of large oval to polygonal $H"{u}rthle$ cells containing abundant granular cytoplasm. The hustopathologic examination confirmed the diagnosis of HCA with follicular growth pattern. Ultrastructurally, the cytoplasm was packed with variable sized mitochondria.