Sailogram and sialendoscopy. Ms ent University exam pattern for 10 marks each. With relevant diagrams.

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SIALOGRAPHY (SIALOGRAM)

10-Mark University Exam Answer - MS ENT

Definition

Sialography is a radiological technique used to visualize the ductal system of the major salivary glands (parotid and submandibular) by injecting radiopaque contrast material into the duct opening. It provides the best detail of the intraglandular ductal architecture and is particularly useful for obstructive and inflammatory duct pathology.

Anatomy Relevant to Sialography

Duct	Length	Caliber	Orientation
Stensen (Parotid)	6-7 cm	1-2 mm	Horizontally oriented
Wharton (Submandibular)	~5 cm	1-3 mm	Angles downward 45° to sagittal/axial planes; courses around mylohyoid

The Wharton duct papilla is smaller, more difficult to cannulate, and the duct itself is easier to perforate. The submandibular duct is longer, more tortuous, and runs against gravity - factors that predispose it to salivary stasis and stone formation.

Indications

Sialolithiasis (salivary calculi/stones)
Ductal stenosis - localized narrowing of the duct
Chronic sialadenitis - to assess ductal irregularities and strictures
Sjogren syndrome - to detect punctate/globular contrast pooling (sialectasia)
Salivary fistula - to delineate fistulous tract
Pre-/post-irradiation assessment - xerostomia evaluation
Recurrent parotitis - recurrent juvenile parotitis

Contraindications

Acute sialadenitis - may exacerbate infection or cause ascending infection (most important)
Iodine contrast allergy
Stones in the oral portion of the Wharton duct - risk of stone impaction
Active infection in the gland

Equipment

Blunt-tipped sialographic cannula with attached tubing
Lacrimal dilators (for dilating the papilla if needed)
Water-soluble contrast agent: diatrizoate meglumine (iodinated, water-soluble - no adverse effects if duct perforation occurs)
Fluoroscopy unit
Secretagogue: lemon juice (to stimulate salivary flow for post-evacuation films)

Technique

Step 1 - Patient preparation: The mucosa around the papilla is dried.

Step 2 - Stimulation of salivary flow: The gland is massaged or a secretagogue (lemon juice) is applied to identify the duct orifice.

Step 3 - Cannulation: A blunt-tipped sialographic cannula is introduced into the duct papilla. Lacrimal dilators may be needed to enlarge the papilla opening.

Step 4 - Contrast injection:

Stensen duct: approximately 1 mL of contrast
Wharton duct: approximately 0.5 mL of contrast
Injected slowly under fluoroscopic guidance to avoid overfilling and perforation

Step 5 - Imaging: Images taken in anteroposterior, lateral, and oblique projections to optimize ductal visualization.

Step 6 - Emptying/evacuation phase: The patient is given sialagogue (lemon juice); films taken to assess ductal drainage and clearance.

Step 7 (Optional): Post-sialographic CT for precise localization of abnormalities within the gland.

Contrast Agents

Water-soluble agents (diatrizoate meglumine): Preferred. Cause no adverse effects even if duct perforation occurs.
Oil-based agents (Lipiodol): Historical use; now rarely used due to risk of lipid granuloma if extravasated.

Normal Sialographic Appearances

Smooth, regular duct with gradual tapering of intraglandular branches ("bare tree in winter" appearance)
No filling defects, no strictures, no pooling of contrast

Pathological Findings

Condition	Sialographic Appearance
Sialolithiasis	Filling defect within duct; proximal ductal dilatation
Ductal stricture	Focal narrowing with pre-stenotic dilatation
Chronic sialadenitis	Multifocal wall irregularities, "sausage-link" duct
Sjogren syndrome	Punctate, globular, cavitary or destructive pattern of contrast pooling (sialectasia)
Salivary fistula	Contrast extravasation through fistulous tract

MR Sialography

First reported in 1996. Uses a heavily T2-weighted sequence to depict ductal system. Saliva itself acts as the endogenous contrast medium (no injection required - non-invasive).

Advantages over conventional sialography:

Non-invasive - no cannulation required
No radiation
Safe in acute sialadenitis (where conventional sialography is contraindicated)
Safe for patients with iodine allergy
Excellent for Sjogren syndrome evaluation, ductal stenosis, post-irradiation xerostomia
Can detect radiolucent stones

Limitation: Difficult to perform in young children; pathological diagnosis can be difficult; ductal metaplasia of sialolithiasis may be misinterpreted as mucoepidermoid carcinoma.

MR Sialography - Axial source images showing cystic dilation of terminal intraparotid ducts in Sjogren syndrome

MR sialogram (A) axial source images showing cystic dilation of terminal intraparotid ducts in Sjogren syndrome; (B) 3D reconstruction demonstrating ductal anatomy. - Cummings Otolaryngology

Complications of Sialography

Local pressure/pain - most common; typically resolves within 24 hours
Ductal perforation - especially Wharton duct
Post-sialographic infection - ascending sialadenitis
Contrast allergy - rare with water-soluble agents
Stone impaction - if stone is in oral portion of duct

CT Sialography

CT with bony windowing is highly effective for sialolithiasis. Multiple hyperdense stones within the submandibular gland and Wharton duct are visible as bright (hyperdense) foci, with associated gland enlargement.

CT scan showing multiple hyperdense sialoliths in the right submandibular gland

CT (bony window) showing multiple hyperdense sialoliths in the right submandibular gland - Cummings Otolaryngology

Digital Subtraction Sialography

Lessens interference from surrounding bony structures
Detects radiolucent stones with sensitivity of 95-100%
Reserved for complex cases

Summary - Role in Current Practice

Conventional sialography has been largely replaced by CT and MRI for most salivary gland pathology. However, it remains the gold standard for depicting fine intraglandular ductal branches. CT/ultrasound are first-line for sialolithiasis. MR sialography, digital sialography, and 3D reconstruction for virtual sialendoscopy are reserved for complex cases.

SIALENDOSCOPY

10-Mark University Exam Answer - MS ENT

Definition

Sialendoscopy is a minimally invasive endoscopic technique used for the diagnosis and treatment of obstructive and inflammatory salivary gland disorders. It allows direct visualization of the ductal system using miniature semirigid or rigid endoscopes introduced through the natural ductal papilla. It represents a paradigm shift from extirpative to gland-preserving surgery.

Historical Background

Sialendoscopy was first introduced in the early 1990s. Advances in miniaturized fiber-optics and instrumentation have allowed endoscopes as small as 0.8 mm to be used safely in adults and children alike.

Indications

Sialolithiasis (salivary duct stones) - most common adult indication
Juvenile recurrent parotitis (JRP) - most common pediatric indication (68.9% of pediatric cases)
Chronic sialadenitis - obstructive or inflammatory
Ductal stenosis (congenital or acquired)
Sjogren syndrome - ductal assessment and intraductal steroid instillation
Salivary gland swelling of unclear etiology after failed imaging
Localization of stones undetected by other imaging modalities

Contraindications

Active acute sialadenitis with significant floor-of-mouth induration
Very distal duct stones (accessible by simple transoral milking)
Patients unable to cooperate (relative - can use general anesthesia)

Instrumentation

Types of Sialendoscopes

1. Diagnostic endoscopes: Equipped with fiber-optic light, image transmission, and irrigation channel. Do NOT allow intraductal instrumentation.

2. Therapeutic endoscopes: Two types:

Compact (single-unit): Fiber light + fiber image transmission + working channel + irrigation channel in one unit. Cannot be disassembled.
Modular (semirigid): Optical fibers in a probe introduced into sheaths of various sizes; gap between probe and sheath = irrigation channel.

Karl Storz Erlangen Mini-Sialendoscope Sizes

Size	Components
0.8 mm	Lens + irrigation channel only
1.1 mm	Lens + irrigation + working channel
1.6 mm	Lens + irrigation + working channel (may be too large for some children)

The working channel allows introduction of:

Microdrill and holmium laser fiber (fragment large stones)
Balloon dilator (ductal stenosis)
Wire basket (stone fragment extraction)

Modular sialendoscope showing image transmitter, irrigation channel, and fiber-optic components

Modular sialendoscope: (A) single-channel, (B) dual-channel, (C) cross-section showing image transmitter, irrigation channel, fiber-optic; (D) wire basket instrument - Cummings Otolaryngology

Anesthesia

Children < 8 years: General anesthesia
Children > 8 years (cooperative) and adults: Can be performed under local anesthesia
A bite block is placed on the contralateral side

Operative Technique (Step-by-Step)

Step 1 - Identification of duct papilla: The papilla of the Stensen duct (parotid) or Wharton duct (submandibular) is identified. The gland is massaged to produce saliva to identify the opening.

Step 2 - Serial dilation: The papilla and duct orifice are dilated using salivary duct probes and dilators in progressive sizes (tapered metal dilators/lacrimal probes). This is the most critical step to allow endoscope entry without ductal injury.

Step 3 - Introducer sheath placement: An introducer sheath is placed in the dilated orifice to facilitate scope entry and repeated introduction/withdrawal.

Step 4 - Endoscope introduction: The sialendoscope (attached to camera and monitor) is introduced via the dilated orifice under continuous saline irrigation to distend the duct and improve visualization.

Sialendoscope inserted through introducer sheath in cannulated submandibular duct papilla

Diagram showing sialendoscope inserted via introducer sheath into the Wharton duct - Cummings Otolaryngology

Step 5 - Ductal exploration: The scope is advanced to the first branching point and each branch is examined as far as the scope can comfortably pass. The ductal mucosa, any stones, strictures, or inflammatory changes are documented.

Step 6 - Therapeutic intervention (if needed):

Stone size/situation	Technique
Small mobile stone	Wire basket - ensnare and extract directly
Large/impacted stone	Holmium laser or pneumatic lithotripsy to fragment first, then basket retrieval
Ductal stenosis	Pneumatic balloon dilation
Post-procedure	Salivary stent left in situ for 2-4 weeks to prevent restenosis

Sialendoscopic view of a stone in salivary duct before and after wire basket retrieval

Sialendoscopic view: (left) stone seen within the duct; (right) wire basket ensnaring the stone for removal - Cummings Otolaryngology

Step 7 - Wire basket with extracted stone:

Stone-extractor wire basket with submandibular stone removed by sialendoscopy

Stone-extractor wire basket containing a submandibular stone removed by sialendoscopy - Cummings Otolaryngology

Combined (Hybrid) Approach

When the stone is:

Too large for endoscopic removal alone
Impacted and inaccessible

A combined approach is used:

The stone is localized endoscopically or by ultrasound
A small incision is made into the duct (intraoral or external) over the stone under direct or endoscopic vision
Submandibular stones: Removed via intraoral incision over the floor of mouth
Parotid (proximal/hilar) stones: May require partial parotidectomy incision and SMAS flap elevation

Success rates with combined techniques: 80-100%

Advantages of Sialendoscopy Over Traditional Surgery

Feature	Sialendoscopy	Traditional (gland excision)
Gland preservation	Yes	No (gland removed)
Invasiveness	Minimal	Major surgery
Anesthesia	Local/GA	GA
Risk to facial/lingual nerve	Minimal	Significant
Recovery	Rapid	Prolonged
Diagnostic + therapeutic	Both in one	Separate

Specific Applications

Juvenile Recurrent Parotitis (JRP)

Most common pediatric indication (68.9%). Sialendoscopy allows ductal irrigation with saline + corticosteroids and can visualize and dilate any strictures - achieving long-term remission in many children.

Sjogren Syndrome

Intraductal instillation of corticosteroids via the sialendoscope can reduce glandular inflammation and improve salivary flow.

Pediatric Sialolithiasis (14.7% of pediatric sialendoscopy cases)

Allows gland-preserving stone removal without the morbidity of excisional surgery in children.

Complications

Ductal perforation - most common (false passage creation during dilation)
Post-operative edema and transient swelling of the gland
Restenosis of the duct (prevented by leaving a stent)
Infection - post-procedure sialadenitis
Incomplete stone removal - requiring repeat procedure or combined approach
Avulsion of the papilla - if excessive force used during dilation

Outcomes

Success rate for stone removal: 80-100% (combined endoscopic + open techniques)
Gland preservation rate: High; avoids need for submandibulectomy or parotidectomy in most cases
Sialendoscopy is now considered a potential gold standard for investigation and treatment of many salivary gland pathologies

Key Differences: Sialography vs Sialendoscopy

Feature	Sialography	Sialendoscopy
Nature	Radiological (imaging)	Endoscopic (surgical)
Purpose	Mainly diagnostic	Diagnostic + therapeutic
Invasion	Cannulation + contrast	Scope + instruments
View	X-ray silhouette of duct	Direct internal view
Stone treatment	No (imaging only)	Yes (basket, laser, lithotripsy)
Use in acute sialadenitis	Contraindicated	Relatively contraindicated
Contrast allergy risk	Yes (iodine)	None
MR variant	MR sialography available	No equivalent

Sources: Cummings Otolaryngology Head and Neck Surgery, 7th Edition, Chapters 82, 83 and 205

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