Parotidectomy
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Direct answer
Parotidectomy is, in essence, facial nerve surgery: the gland is dissected off the nerve rather than the nerve out of the gland. Superficial parotidectomy removes the lobe lateral to the nerve for most benign tumours such as pleomorphic adenoma; total parotidectomy with nerve preservation removes both lobes for deep lobe or malignant tumours; radical parotidectomy sacrifices the nerve when malignancy engulfs it. The trunk is found about 1-1.5 cm deep, just anteroinferior to the tragal pointer between it and the posterior belly of digastric, or by the tympanomastoid fissure; the nerve then divides into upper and lower divisions and five branches within the gland. Frey syndrome (gustatory sweating from aberrant auriculotemporal regeneration, tested by Minor's starch-iodine), greater auricular numbness and facial weakness are the complications every exam expects.
What you must remember
- Landmarks for the trunk (recite four): tragal pointer (nerve about 1-1.5 cm deep and 0.5-1 cm anteroinferior), posterior belly of digastric (nerve just above and anterior), tympanomastoid (Glasserian... correct name: tympanomastoid) suture/fissure pointing directly to the stylomastoid foramen, mastoid process and the cartilaginous "tragal pointer" cone; the nerve lies deep to the parotid-masseteric fascia.
- Nerve anatomy: trunk about 1-1.5 cm... exits stylomastoid foramen, divides within the gland into temporofacial and cervicofacial divisions, then five branches (temporal, zygomatic, buccal, marginal mandibular, cervical); the pes anserinus is the division point.
- Operations by extent: superficial (most pleomorphic adenomas), total with nerve preservation (deep lobe and low-grade malignant tumours), radical (sacrifices nerve, sometimes overlying skin and adjacent bone); extracapsular dissection is a defined option for small mobile benign tumours in selected hands.
- Incisions: modified Blair — preauricular curving around the earlobe into the upper neck; a "face-lift" variant hides the cervical limb.
- Complications to list: facial nerve palsy (temporary neuropraxia common, permanent injury uncommon in benign disease), Frey syndrome, greater auricular nerve numbness of the earlobe, salivary fistula or sialocele, haematoma with airway risk, depressed contour, and numbness of the skin flap.
- Frey syndrome detail: gustatory sweating and flushing of the cheek from parasympathetic fibres of the auriculotemporal nerve misdirected to sweat glands; diagnosed with Minor's starch-iodine test; managed with antiperspirants, topical anticholinergics, botulinum toxin injection, and interpositional barriers at primary surgery.
- Malignant discipline: fine needle aspiration cytology and imaging (ultrasound, MRI) before surgery; frozen section; neck dissection for nodal disease; possible facial nerve sacrifice and reconstruction with cable graft or hypoglossal-facial transfer.
Finding the nerve in a superficial parotidectomy
A 42-year-old has a two-year painless right preauricular swelling; FNAC reports pleomorphic adenoma, and ultrasound confines it to the superficial lobe. A modified Blair incision raises a flap in the plane just deep to the parotid fascia, forward to the tumour's margin and down to the sternocleidomastoid, where the great auricular nerve is encountered — its posterior branch can often be preserved to spare the earlobe permanent numbness. The posterior belly of digastric is skeletonised and the tragal pointer identified: the trunk lies in the dip between the two, about a centimetre or so deep, surrounded by a lobule of gland that must be teased rather than cut. Once the trunk is confirmed by a nerve stimulator, the dissection proceeds forward on the nerve's surface, opening the parotid off each branch — the gland is split, the superficial lobe delivered with the tumour bearing an intact capsule, and the duct ligated. If a branch is adherent to a malignant tumour, the decision changes: sacrifice, immediate cable grafting, and a neck dissection staged the same day. A suction drain closes the case, and the patient is warned about temporary asymmetry from neuropraxia and about sweating of the cheek on eating in future years.
How the viva is scored
Scoring answers on parotidectomy revolve around the nerve. The full-marks anatomical answer names all four routes to the trunk — tragal pointer, digastric, tympanomastoid fissure, and retrograde from a distal branch such as the buccal over the masseter when the tumour obscures the standard field. The Frey syndrome answer must include the mechanism (parasympathetic secretomotor fibres regenerating into sympathetic sweat gland pathways along the auriculotemporal nerve) and Minor's test, because mechanism plus test is the conventional pairing. Indian boards frequently ask the pleomorphic adenoma question — why superficial parotidectomy rather than enucleation — and the expected reasoning is capsular thinness and satellite tumour nodules, giving recurrence rates that made simple enucleation obsolete. Finally, candidates who forget to mention the greater auricular nerve sensory outcome are reminded that the commonest permanent sequela of parotid surgery is numbness, not paralysis.
Frequently asked questions
Which landmarks guide the facial nerve trunk in parotidectomy?
The tragal pointer, the posterior belly of digastric, the tympanomastoid fissure and the mastoid process; the trunk sits roughly 1-1.5 cm deep between pointer and digastric.
How do superficial, total and radical parotidectomy differ?
Superficial removes the lobe lateral to the nerve, total removes both lobes preserving the nerve, and radical sacrifices the nerve with the whole gland for malignancy.
What is Frey syndrome and how is it confirmed?
Gustatory sweating of the cheek from aberrant regeneration of auriculotemporal parasympathetic fibres to sweat glands, confirmed by Minor's starch-iodine test.
Why is enucleation abandoned for pleomorphic adenoma?
The capsule is thin with microscopic extensions and satellite nodules, so enucleation invites multifocal recurrence; superficial parotidectomy delivers the tumour with a cuff of gland.
What is the role of the greater auricular nerve in parotid surgery?
It is routinely divided (though the posterior branch is spared when possible), leaving permanent earlobe and preauricular numbness — the commonest lasting sequela.