Head and neck Flashcards
What is the most common benign salivary gland tumour?
Pleomorphic adenoma
What is the most common malignant salivary gland tumour?
Mucoepidermoid
Of the following which is most likely to be malignant;
a tumour in parotid, a tumour in submandibular gland, a tumour in sunlingual gland?
Smaller glands higher risk.
Mini malignant
Big benign
Parotid Gland: 75-85% are Benign
Submandibular Gland: 57-63% are Benign
Minor Glands: 85% are Malignant
What is the anterior triangle of the neck? What are the important contents?
Borders are:
Anterior: Midline between mentum and sternal notch.
Superior: Mandible
Lateral: SCM Anterior border
Contents:
Muscles
- digastric
- stylohyoid
- mylohyoid
- geniohyoid
- sternohyoid
- omohyoid
- thyrohyoid
- sternothyroid
- plastysma
Arteries
- common, internal and external carotid
- branches from ext carotid = superior thyroid, ascending pharyngeal, lingual, facial, mylohyoid atery (maxillary via inferior alveolar).
Veins
- internal and anterior jugular
- facial
Nerves
- Hypoglossal
- ansa cervicalis
- mylohyoid nerve from the mandibular division of the trigeminal nerve via inferior alveolar nerve
- vagus and its branches internal and external branches of superior laryngeal and recurrent laryngeal.
Glands
- Submandibular
- lymph nodes
Other
Hyoid bone
Thyroid
Parathyroids
Larynx
Trachea
Oesophagus
What is the posterior triangle of the neck? What are the important contents?
Borders are:
Posterior: Trapezius
Inferior: Clavicle
Anterior: SCM Posterior border
Contents:
Spinal accessory nerve & brachial plexus
What are the triangles within the anterior triangle?
Digastric = Borders; two bellies of diagstric and lower border of mandible. Floor; Mylohyoid and hyoglossus
Carotid triangle = Borders; SCM, posterior belly of digastric and superior body of omohyoid. Floor; middle and inferior constrictors, hyoglossus and thyrohyoid
Submental triangle = Borders; Two anterior bellies of digastric and body of hyoid bone. Floor; Parts of both mylohyoid muscles.
Muscular triangle = Borders; SCM, superior belly omohyoid & midline of neck.
What is the exception to the rule “all intrinsic muscles of the larynx lie inside the larynx”?
Except the cricothyroid which lies on the outside of the larynx
What is the exception to the rule “All intrinsic muscles of the larynx either close or loosen the cords”?
Except posterior cricoarytenoid which opens them and cricothyroid which tightens them
What is the exception to the rule “All intrinsic muscles of the larynx are innervated by the recurrent laryngeal nerve”?
Except the cricothyroid which is supplied by external branch of superior laryngeal nerve.
What is the exception to the rule “The hypoglossal nerve passes lateral to all important structures in the neck”?
Except the facial vein which passes lateral (superficial) to the nerve.
What is the exception to the rule “All muscles of the pharynx remain relaxed until a bolus arrives”?
Except the cricopharyngeus which remains closed until a bolus approaches.
What is the exception to the rule “All muscles of the pharynx are supplied by the pharyngeal plexus (IX, X & sympathetic)
Except stylopharyngeus which is supplied by the glossopharyngeal nerve (IX) & cricopharyngeus which is supplied by the recurrent laryngeal nerve (X).
What are the cervical lymph node levels?
I
Ia: Submental
Ib: Submandibular Triangle
Separated by Anterior Digastric
II: Upper Jugular
IIa: Anterior to Accessory Nerve
IIb: Posterior to Accessory Nerve
III: Middle Jugular (Hyoid to Inferior Cricoid)
IV: Lower Jugular
V: Posterior Triangle (Behind SCM)
Va: Superior to Cricoid
Vb: Inferior to Cricoid
VI: Central
Boundaries: Hyoid, Carotid Artery, Sternal Notch
How much saliva and what types are produced by each of the salivary glands?
Parotid - 20%, Serous
Submandibular - 65-70%, serous and mucin
Sublingual - ~10%, mucin (to lesser degree serous)
Spot diagnosis
Torus palatinus - exotosis of bony palate covered in mucosa. Benign. Only interfere if impairing with mastication or speech.
Tell me about Sialolithiasis and siladenitis. (DIPSCHIT)
Sialolithiasis = stone in salivary gland duct.
Siladenitis = inflammation of salivary gland.
Incidence and risk factors (stones):
- stagnant flow of saliva
- inflammation or injury
- males >female
- hypovolaemia or diuretics
- anticholinergic medications
- tobacco
Pathophysiology:
Most commonly in submandibular gland (80-90%) due to its longer duct, slow flow of saliva against gravity and its high mucin and calcium content.
Signs and symptoms:
Pain
Swelling
Stone may be visible
Histo: NA
Investigations:
Diagnosed clinically but imaging used if concern for abscess or differentials.
Treatment:
- conservative, good hydration
- duct massage
- salivation (hard candies, lemon drops)
- NSAIDs
If Fails: Minimally Invasive Intervention
Sialoendoscopy with Stone Removal
Laser Lithotripsy
Extracorporeal Lithotripsy
If Still Fails: Surgical Stone Removal
ABX if Concerned for Secondary Infection (Fever/Purulence)