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A female came to ENT OPD with history of painless swelling in the right submandibular region for the last 4 months. On examination, there was firm, non-tender swelling in the right submandibular region. Write down its differential diagnosis. If it comes out to be chronic Sm sialolithiasis, how will you treat?

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Differential Diagnosis of Painless, Firm, Non-tender Right Submandibular Swelling (4 months)

A slow-growing, painless, firm swelling in the submandibular triangle in a female needs to be worked through systematically because this region contains the submandibular salivary gland, level Ib lymph nodes, and several other structures.
A. Submandibular salivary gland lesions
  • Chronic submandibular sialolithiasis / chronic sialadenitis - classically gives a firm, sometimes tender-on-and-off swelling with a history of colicky pain and swelling on eating (though it can present relatively painlessly if chronic and fibrosed).
  • Pleomorphic adenoma (mixed tumour) - the commonest neoplasm of the submandibular gland; presents as a slow-growing, firm, non-tender, mobile swelling - exactly matching this presentation - Bailey and Love's Short Practice of Surgery, p. 858; S Das A Manual on Clinical Surgery, p. 366.
  • Malignant salivary tumour (mucoepidermoid carcinoma, adenoid cystic carcinoma) - suspect if fixation, facial/lingual nerve involvement, or rapid recent growth on a background of long-standing swelling.
  • Chronic sclerosing sialadenitis (Kuttner tumour) - mimics a neoplasm clinically.
B. Lymph node causes (level Ib nodes)
  • Tuberculous lymphadenitis (common cause of chronic, firm, non-tender neck node in the subcontinent)
  • Chronic non-specific/reactive lymphadenitis
  • Lymphoma
  • Metastatic lymph node from an oral cavity/tongue/lip primary (look for a mucosal ulcer)
C. Other swellings in this region
  • Plunging ranula
  • Sublingual dermoid cyst extending into the neck
  • Branchial cleft cyst (less typical location)
  • Lipoma or sebaceous cyst of overlying skin
  • Submandibular abscess/Ludwig's angina - usually acute and painful, so less likely here
The key discriminators clinically are: bidigital palpation of the duct for a stone, expression of saliva from Wharton's duct on massage, evaluation for a discrete mobile mass versus a diffuse glandular enlargement, and examination of the oral cavity/tongue for a primary lesion if nodal disease is suspected. Plain radiograph (occlusal view) or ultrasound of the floor of mouth/submandibular region is the first-line investigation to look for a calculus - Bailey and Love's Short Practice of Surgery, p. 858.
Occlusal view showing a stone in the submandibular gland

Treatment if Diagnosis is Chronic Submandibular Sialolithiasis

Management depends on stone location, size, and how much chronic glandular damage has already occurred.
1. Conservative/initial measures
  • Hydration, sialogogues (lemon drops/sour sweets), warm compresses, gland massage, and analgesics/anti-inflammatories - useful for small stones and early disease, or while awaiting definitive treatment.
  • Antibiotics if secondary infection/sialadenitis is present.
2. Minimally invasive, gland-preserving options (best for a solitary, accessible stone with a reasonably functioning gland)
  • Distal duct stones (palpable near the duct orifice): removed transorally by duct slitting/marsupialization under local anaesthesia.
  • Sialendoscopy: allows direct visualisation of the duct system; stones under about 5 mm can be retrieved endoscopically with a basket; intraparenchymal stones of 5-7 mm can also be managed this way; larger stones need combined transoral/endoscopic removal.
  • Extracorporeal shock wave lithotripsy (ESWL): for stones that are not palpable or not amenable to endoscopy, generally limited to stones smaller than 7-10 mm.
  • Sialography, besides being diagnostic (gold standard for delineating ductal anatomy), can occasionally be therapeutic by dislodging small stones - Bailey and Love's Short Practice of Surgery, p. 859.
3. Definitive surgery - excision of the submandibular gland (submandibular sialadenectomy) This is the treatment of choice in chronic sialolithiasis, i.e., when there is:
  • Multiple or large intraglandular (hilar) stones,
  • Recurrent sialadenitis with a chronically damaged, fibrosed, poorly functioning gland,
  • Failure of conservative or minimally invasive measures, or
  • A stone that is not accessible endoscopically/transorally.
Gland excision is performed through a transcervical (submandibular) incision with care to identify and preserve the marginal mandibular branch of the facial nerve, the lingual nerve, and the hypoglossal nerve. This is regarded as the "last resort" for isolated duct stones but is the standard, definitive treatment once the gland itself is chronically diseased - Bailey and Love's Short Practice of Surgery, p. 859.
Summary of approach: Confirm the stone and its location with ultrasound/occlusal radiograph/sialography or sialendoscopy. If the stone is distal and the gland is otherwise healthy, do a gland-preserving transoral or endoscopic removal. If the disease is truly chronic with recurrent infection and glandular fibrosis (as implied by "chronic" sialolithiasis in this case), proceed to excision of the submandibular gland.
I did not find recent (last 2 years) systematic reviews/meta-analyses on this topic that would change this standard teaching, so no contradicting evidence to flag.
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