Pneumoparotitis is a rare cause of parotid gland swelling. We report a case of self-induced pneumoparotitis that resulted in subcutaneous emphysema and pneumomediastinum after an open biopsy of the parotid gland. We suggest a new method for diagnosing this condition. This is done by insufflation of the cheeks with contrast in the oral cavity. A reflux of air and contrast is subsequently demonstrated by a computed tomography scan of the area.