A rare cause of unilateral parotid gland swelling: compensatory hypertrophy due to the aplasia of the contralateral parotid gland.

In this clinical report, 3 cases, admitted to the ears, nose, throat outpatient clinic with the complaints of unilateral swelling in the parotid region and facial asymmetry, are presented. In the etiology, contralateral parotid gland aplasia with compensatory hypertrophy and sialosis was detected. With this rare condition, clinical and radiological features of this anomaly are discussed.