The patient was given a diagnosis of sialadenosis (also known as sialosis), a noninflammatory, non-neoplastic enlargement of the parotid glands. It can often manifest as fatty degeneration of the parotid glands, which may be associated with underlying conditions such as hypertriglyceridemia, diabetes, and metabolic syndrome.1-3
Ultrasonography and a subsequent computed tomography with contrast demonstrated fatty hypertrophy of the parotid glands without any concerning parotid mass or enlarged cervical lymph nodes. No abnormalities of the ductal system (eg, stricture or obstruction with stone) were noted, so sialography and sialendoscopy were not indicated.
Evaluation for inflammatory, autoimmune, and granulomatous diseases was negative, including negative anti-Ro/SSA and anti-La/SSB antibodies and negative HIV screen. However, our patient had an elevated serum triglyceride level of 589 mg/dL (reference range, < 150 mg/dL), while serum total cholesterol was within the reference range (< 200 mg/dL). (Interestingly, his triglycerides were normal a year earlier.) The patient’s A1c level was normal.
The differential diagnosis for this patient included Sjögren syndrome, abscess, viral infection (eg, mumps, HIV sialopathy), Kimura disease, sarcoidosis, masseter hypertrophy, and tumors of the parotid gland (eg, Warthin tumor and pleomorphic adenoma). Drug-induced sialadenitis was another possibility, as several drugs may be associated with salivary gland enlargement.4 However, no association was found for our patient.
Primary management is focused on treating the underlying disorder. The application of heat, massage, and sialagogues (eg, pilocarpine 5 mg orally tid) can be used to stimulate salivation, which may help reduce the swelling. Bilateral parotid gland swelling in patients with increased triglyceride levels often resolves after treatment of hypertriglyceridemia.3,5 Less common modalities include botulinum neurotoxin injection, tympanic neurectomy, and parotidectomy.6
The treatment plan for this patient included aggressive dietary modification and increasing his current dosage of atorvastatin from 20 mg to 80 mg at bedtime. Increasing the dosage of statin was preferred over adding another agent (such as fibrates) to decrease the risk of myopathy. Fine-needle aspiration biopsy may be considered if the swelling does not resolve after correction of lipid abnormalities, which can take between 6 months and 3 years.3
Photo courtesy of Faryal Tahir, MD. Text courtesy of Faryal Tahir, MD, Assistant Professor, and Daniel Stulberg, MD, FAAFP, Professor and Chair, Department of Family and Community Medicine, Western Michigan University, Homer Stryker, MD School of Medicine, Kalamazoo.