What is Sialolithiasis?
Sialolithiasis is the formation of calcified stones (sialoliths) within the salivary glands or their ductal systems, most commonly affecting the submandibular gland in approximately 80% of cases. 1
Definition and Pathophysiology
Sialolithiasis represents the development of calcareous concretions within the parenchyma or ductal system of major or minor salivary glands. 2, 3
The condition results from calcific deposits that obstruct salivary flow, leading to characteristic clinical manifestations. 4
Clinical Presentation
Patients typically present with intermittent painful swelling of the affected gland, particularly during mealtimes when salivary flow increases. 2, 4
The pathognomonic symptom is pain and swelling that worsens with eating, occurring in adults aged 30-60 years most commonly. 4
If left untreated, sialolithiasis can progress to sialadenitis (gland inflammation) and potentially gland atrophy. 1
Anatomic Distribution
The submandibular gland is the most frequently affected site, accounting for the vast majority of cases. 1, 5, 2
The parotid gland can also be affected, though this is less common, particularly in pediatric populations. 6
Stone Characteristics
Sialolith size typically ranges from 1-10 mm, though giant stones exceeding 20 mm have been documented. 3
Unusually large stones measuring up to 35 mm have been reported in rare cases with long-standing disease. 5
The formation of sialo-oral or sialo-cutaneous fistulas may promote growth of giant sialoliths measuring 15-20 mm or larger. 3
Risk Factors
Established risk factors include dehydration, tobacco smoke exposure, autoimmune disorders, and certain medications. 1
Anatomic factors such as mandibular tori (bony outgrowths on the lingual surface of the mandible) may contribute through external compression of the submandibular duct, impeding salivary flow. 1
Complications
Acute complications include painful gland swelling and potential airway compromise in severe cases. 1
Chronic untreated disease can lead to recurrent sialadenitis, gland fibrosis, and eventual gland atrophy. 5
Rare complications include spontaneous cutaneous fistula formation, particularly in pediatric parotid sialolithiasis. 6