Head and Neck Surgery

🎯 The Surgical Crucible: Navigating Head and Neck Territory

Head and neck surgery demands mastery of anatomy's most compact, unforgiving real estate-where millimeters separate vital structures and surgical precision determines function, cosmesis, and survival. This lesson builds your understanding from anatomical foundations through complex reconstructive techniques, integrating airway management, oncologic principles, and tissue transfer strategies. Master these concepts, and you transform surgical challenges into systematic problem-solving frameworks that guide every incision, dissection, and reconstruction.

🗺️ Anatomical Command Center: The Neck's Strategic Architecture

Understanding neck anatomy unlocks the logic behind every surgical approach, dissection plane, and complication pattern. The neck's fascial compartments, vascular territories, and lymphatic drainage define surgical corridors and danger zones.

Fascial Framework: Nature's Surgical Planes

The cervical fascia creates distinct compartments that guide surgical dissection and contain pathology:

• Superficial Cervical Fascia

  • Contains platysma muscle and superficial veins
  • Extends from mandible to clavicle
  • Surgical plane for skin flap elevation
  • Preserves subdermal plexus when elevated 2-3 mm deep

• Deep Cervical Fascia: Three Critical Layers

  • Superficial Layer (Investing)
    • Encircles entire neck like a collar
    • Splits to envelop SCM and trapezius
    • Forms roof of posterior triangle
    • Contains submandibular and parotid glands
  • Middle Layer (Visceral)
    • Pretracheal division: thyroid, trachea, esophagus
    • Buccopharyngeal division: pharynx and esophagus
    • Creates surgical plane anterior to carotid sheath
    • Infection here spreads to superior mediastinum
  • Deep Layer (Prevertebral)
    • Covers vertebral column and paraspinal muscles
    • Extends from skull base to T3 vertebra
    • Forms floor of posterior triangle
    • Alar fascia subdivision creates retropharyngeal space

📌 Remember: SIPS for fascial layers-Superficial, Investing, Pretracheal, Prevertebral-each creating distinct surgical and infection pathways

Triangular Territory: Neck's Anatomical Subdivisions

• Anterior Triangle Boundaries

  • Superior: mandible
  • Lateral: anterior border of SCM
  • Medial: midline of neck
  • Contains 4 subdivisions: submental, submandibular, carotid, muscular
  • Houses carotid sheath contents, thyroid, larynx, trachea

• Posterior Triangle Boundaries

  • Anterior: posterior border of SCM
  • Posterior: anterior border of trapezius
  • Inferior: middle third of clavicle
  • Floor: prevertebral fascia over scalene muscles
  • Contains spinal accessory nerve (CN XI) at Erb's point (6 cm superior to clavicle)

⭐ Clinical Pearl: The spinal accessory nerve crosses the posterior triangle at its most vulnerable point-5-7 cm below the mastoid tip-where it's susceptible to iatrogenic injury during lymph node biopsy. Injury causes shoulder dysfunction with inability to abduct arm beyond 90 degrees.

Vascular Highway: Carotid System Mastery

• Carotid Sheath Contents (Medial to Lateral)

  • Internal jugular vein (lateral, largest)
  • Common/internal carotid artery (medial)
  • Vagus nerve (posterior, between vessels)
  • Deep cervical lymph nodes (external to sheath)

• Critical Vascular Relationships

  • Common carotid bifurcation: C3-C4 level (thyroid cartilage superior border)
  • Carotid body: chemoreceptor at bifurcation
  • Carotid sinus: baroreceptor in proximal internal carotid
  • External carotid: 8 branches (mnemonic below)
  • Internal carotid: no cervical branches (enters skull via carotid canal)

📌 Remember: SALFOPMS for external carotid branches-Superior thyroid, Ascending pharyngeal, Lingual, Facial, Occipital, Posterior auricular, Maxillary, Superficial temporal-tested relentlessly in surgical anatomy

💡 Master This: The cricoid cartilage at C6 marks the transition point where pharynx becomes esophagus, larynx becomes trachea, and carotid becomes palpable against vertebral body-making it the neck's most critical anatomical crossroads for airway management.

Lymphatic Drainage: Nodal Level System

The neck's lymphatic architecture follows predictable patterns essential for oncologic surgery:

• Level Classification (Memorial Sloan Kettering)
  • Level Ia: Submental nodes (between anterior bellies of digastric)
  • Level Ib: Submandibular nodes (within submandibular triangle)
  • Level II: Upper jugular nodes (skull base to hyoid)
    • IIa: anterior to spinal accessory nerve
    • IIb: posterior to spinal accessory nerve
  • Level III: Middle jugular nodes (hyoid to cricoid)
  • Level IV: Lower jugular nodes (cricoid to clavicle)
  • Level V: Posterior triangle nodes (along spinal accessory nerve)
    • Va: above cricoid
    • Vb: below cricoid
  • Level VI: Central compartment (hyoid to sternal notch, between carotid sheaths)
  • Level VII: Superior mediastinal nodes (sternal notch to innominate vein)

⭐ Clinical Pearl: Oral cavity cancers drain to Levels I-III in >75% of cases, while thyroid cancer preferentially involves Level VI in >60% of cases-understanding drainage patterns predicts nodal metastasis and guides surgical planning.

Connect this anatomical foundation through to understand how surgical approaches exploit these natural planes and compartments.

📚 Airway Dominance: Securing the Critical Corridor

Airway management in head and neck surgery transcends routine anesthesia-tumor mass, tissue distortion, radiation fibrosis, and surgical manipulation create scenarios where airway loss equals catastrophe. Master airway assessment, prediction, and rescue techniques to navigate the most challenging intubations.

Preoperative Airway Prediction: The LEMON Framework

Systematic assessment identifies difficult airways before crisis:

• L = Look Externally

  • Facial trauma, burns, tumors
  • Micrognathia, retrognathia
  • Macroglossia, beard presence
  • Neck masses causing tracheal deviation

• E = Evaluate 3-3-2 Rule

  • 3 fingers (≥5 cm): mouth opening (inter-incisor distance)
  • 3 fingers (≥6 cm): hyoid-to-mentum distance
  • 2 fingers (≥3 cm): thyroid-to-hyoid distance
  • Failure of any measurement predicts difficult laryngoscopy

• M = Mallampati Score

  • Class I: soft palate, uvula, fauces, pillars visible
  • Class II: soft palate, uvula, fauces visible
  • Class III: soft palate, base of uvula visible
  • Class IV: only hard palate visible
  • Class III-IV: 10-fold increased difficult intubation risk

• O = Obstruction

  • Epiglottitis, abscess, angioedema
  • Stridor at rest: <50% airway diameter
  • Any condition causing airway narrowing

• N = Neck Mobility

  • Cervical spine limitation (trauma, arthritis, radiation)
  • Need ≥35 degrees atlanto-occipital extension
  • Fixed flexion deformity prevents alignment

📌 Remember: LEMON assessment takes <2 minutes but predicts >85% of difficult airways-systematic evaluation prevents airway disasters

Advanced Airway Techniques: When Standard Fails

• Awake Fiberoptic Intubation (AFOI)

  • Gold standard for predicted difficult airway
  • Success rate >95% in experienced hands
  • Requires patient cooperation and topical anesthesia
  • Preparation time: 15-20 minutes
  • Steps: topicalization → sedation → scope insertion → tube railroading → confirmation

• Video Laryngoscopy

  • Improves glottic visualization by 60-70% vs direct laryngoscopy
  • Particularly useful with Cormack-Lehane Grade III-IV views
  • Hyperangulated blades (GlideScope, McGrath) for anterior airways
  • May require stylet angulation to match blade curve

• Supraglottic Airways (SGA)

  • Second-generation devices (LMA ProSeal, i-gel) allow ventilation pressures >20 cm H₂O
  • Serve as conduit for fiberoptic intubation
  • Cannot Intubate, Can Ventilate scenario bridge
  • Success rate for rescue ventilation: >90%

⭐ Clinical Pearl: In head and neck cancer patients with radiation-induced fibrosis, awake fiberoptic intubation is mandatory-tissue rigidity prevents bag-mask ventilation in >40% of cases, making "can't intubate, can't ventilate" scenarios 5-fold more likely than general surgical patients.

Surgical Airway: Front of Neck Access

When non-invasive techniques fail, surgical airway saves lives:

• Cricothyroidotomy Technique

  • Indications: emergency airway, cannot intubate/cannot ventilate
  • Landmark: cricothyroid membrane (2-3 cm wide, 1 cm high)
  • Approach: vertical skin incision, horizontal membrane incision
  • Tube size: 5-6 mm inner diameter
  • Time to oxygenation: <60 seconds in trained hands
  • Complications: bleeding (5%), subglottic stenosis if prolonged (>72 hours)

• Tracheostomy: Elective vs Emergency

  • Elective indications:
    • Prolonged ventilation expected (head/neck cancer surgery)
    • Airway protection (bilateral vocal cord paralysis)
    • Secretion management (bulbar dysfunction)
  • Technique:
    • Horizontal incision 1-2 cm above sternal notch
    • Divide thyroid isthmus or retract
    • Enter trachea at 2nd-3rd tracheal ring
    • Create Bjork flap (inferiorly based) or window
    • Tube size: 7-8 mm for adults
  • Percutaneous dilatational tracheostomy (PDT):
    • Bedside technique for ICU patients
    • Success rate >95% with bronchoscopic guidance
    • Contraindicated in emergency or distorted anatomy

💡 Master This: The cricothyroid membrane is palpable in >90% of patients and represents the fastest surgical airway access-but convert to formal tracheostomy within 72 hours to prevent subglottic stenosis, which occurs in >30% of prolonged cricothyroidotomies.

Extubation Strategy: The Forgotten Danger

Extubation after head and neck surgery carries unique risks-tissue edema, hematoma, and recurrent laryngeal nerve injury threaten airway patency:

• High-Risk Extubation Criteria

  • Surgery duration >6 hours
  • Bilateral neck dissection
  • Significant intraoperative fluid administration (>4 liters)
  • Preoperative airway compromise
  • Extensive tongue/floor of mouth resection

• Cuff Leak Test

  • Deflate endotracheal tube cuff, occlude tube
  • Measure exhaled tidal volume difference
  • Leak <110 mL predicts post-extubation stridor with 85% sensitivity
  • Consider delaying extubation if inadequate leak

• Staged Extubation Techniques

  • Airway exchange catheter (AEC) placement
  • Allows reintubation over catheter if needed
  • Remove 12-24 hours post-extubation if stable
  • Cook catheter: 11-14 Fr, hollow, allows oxygen insufflation

⭐ Clinical Pearl: Post-operative hematoma after thyroid/parathyroid surgery occurs in 1-2% of cases but can cause airway obstruction within minutes-bedside wound opening and hematoma evacuation must precede reintubation attempts, as expanding hematoma distorts anatomy and prevents intubation in >60% of cases.

Integrate these airway principles through for comprehensive crisis management strategies.

🔬 Oncologic Principles: The Cancer Control Framework

Head and neck cancer management demands understanding tumor behavior, spread patterns, and treatment sequencing. Squamous cell carcinoma dominates this anatomic region, with >90% of malignancies arising from mucosal surfaces.

Tumor Biology: Understanding the Enemy

• Risk Factor Synergy

  • Tobacco: 6-fold increased risk (dose-dependent)
  • Alcohol: 7-fold increased risk (>4 drinks/day)
  • Combined tobacco + alcohol: 30-fold increased risk (multiplicative, not additive)
  • HPV (Human Papillomavirus): distinct entity, better prognosis
    • HPV-positive oropharyngeal cancer: 5-year survival 80-85%
    • HPV-negative: 5-year survival 40-50%
    • p16 immunohistochemistry: surrogate marker (>70% nuclear/cytoplasmic staining)

• Field Cancerization Concept

  • Entire upper aerodigestive tract exposed to carcinogens
  • Second primary tumor risk: 3-7% per year
  • Synchronous primaries: 10-15% at diagnosis
  • Metachronous primaries: 20-30% over lifetime
  • Mandates complete mucosal examination (panendoscopy)

• Lymphatic Metastasis Patterns

  • Predictable drainage pathways by primary site
  • Occult nodal metastasis rates (clinically N0):
    • T1 oral cavity: 15-20%
    • T2 oral cavity: 30-40%
    • T3-T4 oral cavity: 40-50%
  • Extracapsular extension (ECE): worst prognostic factor
    • Reduces survival by 50%
    • Mandates adjuvant chemoradiation

📌 Remember: HPV TOPS for HPV-positive oropharyngeal cancer characteristics-Higher survival, P16 positive, Viral etiology, Tonsil/base of tongue, Oropharynx primary, Patients younger/non-smokers, Sensitive to treatment

TNM Staging: Mapping Disease Extent

The AJCC 8th edition (2017) introduced separate staging for HPV-positive oropharyngeal cancer:

• T Stage (Primary Tumor)

  • Oral cavity example:
    • T1: ≤2 cm, depth of invasion (DOI) ≤5 mm
    • T2: ≤2 cm with DOI >5 mm to ≤10 mm, OR >2 cm to ≤4 cm with DOI ≤10 mm
    • T3: >4 cm OR any size with DOI >10 mm
    • T4a: moderately advanced (resectable)-invades cortical bone, maxillary sinus, skin
    • T4b: very advanced (unresectable)-invades masticator space, pterygoid plates, skull base, carotid artery

• N Stage (Regional Nodes)

  • HPV-negative (traditional):
    • N1: single ipsilateral node ≤3 cm
    • N2a: single ipsilateral node >3 cm to ≤6 cm
    • N2b: multiple ipsilateral nodes ≤6 cm
    • N2c: bilateral/contralateral nodes ≤6 cm
    • N3a: any node >6 cm
    • N3b: any node with clinical ECE
  • HPV-positive (clinical staging):
    • N1: ≤4 ipsilateral nodes
    • N2: >4 ipsilateral nodes OR any contralateral/bilateral nodes
    • N3: nodes >6 cm

• M Stage (Distant Metastasis)

  • M0: no distant metastasis
  • M1: distant metastasis present
  • Common sites: lungs (40%), bone (25%), liver (20%)

💡 Master This: Depth of invasion (DOI) revolutionized oral cavity staging-a 2 cm tumor with 6 mm DOI is now T2 (previously T1), reflecting the 3-fold increased nodal metastasis risk when DOI exceeds 5 mm, fundamentally changing treatment recommendations.

Treatment Paradigms: Surgery vs Radiation vs Combined

• Single Modality (Early Stage: I-II)

  • Surgery alone: T1-T2, N0-N1
    • 5-year local control: 85-90%
    • Preserves radiation for salvage or second primary
    • Preferred for oral cavity (radiation causes xerostomia, osteoradionecrosis)
  • Radiation alone: T1-T2 glottic larynx
    • 5-year local control: >90%
    • Voice preservation
    • 66-70 Gy over 6-7 weeks

• Combined Modality (Locally Advanced: III-IV)

  • Surgery + adjuvant radiation:
    • Indications: pT3-T4, close margins (<5 mm), perineural invasion, lymphovascular invasion
    • Dose: 60 Gy if negative margins, 66 Gy if positive margins
  • Surgery + adjuvant chemoradiation:
    • Indications: extracapsular extension (ECE) or positive margins
    • Improves 5-year survival by 6-8% vs radiation alone
    • Cisplatin 100 mg/m² every 3 weeks × 3 cycles concurrent with radiation
  • Definitive chemoradiation (organ preservation):
    • Indications: larynx/hypopharynx cancer (voice preservation), unresectable disease
    • 70 Gy with concurrent cisplatin
    • Salvage surgery if persistent/recurrent disease

⭐ Clinical Pearl: The RTOG 91-11 trial established concurrent chemoradiation as superior to induction chemotherapy or radiation alone for laryngeal preservation-2-year laryngectomy-free survival 88% with concurrent vs 75% with induction-but functional outcomes (swallowing, voice) are often better with upfront surgery in T3-T4 disease.

Explore site-specific management through and for detailed treatment algorithms.

🏥 Neck Dissection Mastery: Lymphadenectomy Logic

Neck dissection removes lymph nodes at risk for metastatic disease while preserving critical non-lymphatic structures. The classification system defines extent based on nodal levels removed and structures sacrificed.

Classification System: Defining the Dissection

• Radical Neck Dissection (RND)

  • Removes: Levels I-V + SCM + IJV + CN XI
  • Historical gold standard, now rarely performed
  • Indications: gross involvement of non-lymphatic structures
  • Complications: shoulder dysfunction (CN XI loss), facial edema (IJV loss)

• Modified Radical Neck Dissection (MRND)

  • Removes: Levels I-V
  • Preserves: ≥1 non-lymphatic structure (SCM, IJV, CN XI)
  • Types:
    • Type I: preserves CN XI
    • Type II: preserves CN XI + IJV
    • Type III: preserves CN XI + IJV + SCM
  • Most common comprehensive dissection in current practice
  • 5-year regional control: >90% for N1-N2a disease

• Selective Neck Dissection (SND)

  • Removes: <5 nodal levels based on primary site drainage
  • Types:
    • Supraomohyoid (Levels I-III): oral cavity primary
    • Lateral (Levels II-IV): oropharynx, hypopharynx, larynx
    • Posterolateral (Levels II-V): cutaneous malignancy, thyroid
    • Central (Level VI): thyroid, hypopharynx, cervical esophagus
  • Advantages: reduced morbidity, preserved shoulder function
  • Oncologic equivalence to MRND for N0-N1 disease

• Extended Neck Dissection

  • Removes additional structures/nodal groups beyond Levels I-V
  • Examples: retropharyngeal nodes, parapharyngeal nodes, superior mediastinal nodes (Level VII)

📌 Remember: MRND 123 for modified radical types-MRND preserves 1 structure (CN XI), 2 structures (CN XI + IJV), or 3 structures (CN XI + IJV + SCM)-distinguishing it from radical dissection

Surgical Technique: Key Steps and Landmarks

• Incision Planning

  • Apron incision: bilateral access, better cosmesis, risk of flap necrosis if previous radiation
  • Utility incision (hockey stick): unilateral, extensile, allows parotidectomy/mandibulotomy
  • Avoid trifurcation points (impaired healing)-keep intersections obtuse angle >60 degrees

• Flap Elevation Principles

  • Subplatysmal plane preserves blood supply
  • Elevate 2-3 mm deep to dermis to preserve subdermal plexus
  • Superior limit: 1-2 cm below mandible (protects marginal mandibular nerve)
  • Inferior limit: clavicle
  • Posterior limit: anterior border of trapezius

• Critical Nerve Preservation

  • Marginal mandibular nerve:
    • Runs ≤1 cm below mandible in 75%, ≤2 cm in 95%
    • Crosses facial vessels at mandibular angle
    • Injury causes lower lip asymmetry (inability to depress lip)
  • Spinal accessory nerve (CN XI):
    • Enters posterior triangle at Erb's point (6 cm above clavicle)
    • Runs obliquely across posterior triangle to trapezius
    • Most commonly injured nerve in neck dissection
    • Injury causes shoulder drop, inability to abduct arm >90 degrees, chronic pain
  • Vagus nerve:
    • Lies posterior in carotid sheath between IJV and carotid
    • Give off recurrent laryngeal nerve (RLN) at different levels:
      • Right RLN: loops under subclavian artery at T1-T2
      • Left RLN: loops under aortic arch at T4-T5
    • Injury causes vocal cord paralysis, aspiration risk
  • Phrenic nerve:
    • Runs on anterior scalene muscle (floor of posterior triangle)
    • Deep to prevertebral fascia-preserve fascia to protect nerve
    • Injury causes hemidiaphragm paralysis, dyspnea

⭐ Clinical Pearl: The spinal accessory nerve is 5-6 times more superficial in the posterior triangle than the phrenic nerve-CN XI runs above the prevertebral fascia while phrenic runs beneath it, making fascial plane respect critical for nerve preservation.

Complications and Management

• Intraoperative Complications

  • Vascular injury (2-3%):
    • Most common: IJV, external jugular vein, transverse cervical vessels
    • Management: direct pressure, ligation, repair if carotid
  • Nerve injury:
    • CN XI: 5-10% temporary, 1-2% permanent
    • Marginal mandibular: 5-15% temporary (neuropraxia), <2% permanent
    • Vagus/RLN: <1% if not deliberately sacrificed
  • Chyle leak (left neck > right):
    • Thoracic duct injury in 1-3% of left neck dissections
    • Enters neck at junction of left IJV and subclavian vein
    • Output >600 mL/day requires surgical re-exploration

• Postoperative Complications

  • Seroma/hematoma (5-10%):
    • Prevent with closed suction drainage
    • Remove drains when output <30 mL/day
  • Wound infection (3-5%):
    • Higher with prior radiation, diabetes, smoking
    • Prophylactic antibiotics reduce risk by 50%
  • Shoulder syndrome (20-30% with CN XI sacrifice):
    • Pain, limited abduction, trapezius atrophy
    • Physical therapy started 2-3 weeks post-op
    • Improvement over 6-12 months but rarely complete

Connect neck dissection principles through and for comprehensive surgical strategy.

🔍 Reconstructive Ladder: Tissue Transfer Strategies

Head and neck reconstruction aims to restore form and function after oncologic resection. The reconstructive ladder progresses from simple to complex based on defect characteristics.

Reconstructive Ladder Concept

• Rungs of the Ladder (Simple → Complex)

  1. Primary closure: small defects, minimal tension
  2. Healing by secondary intention: small superficial defects
  3. Skin grafts: coverage without bulk, no major functional requirement
  4. Local flaps: adjacent tissue, similar texture/color
  5. Regional pedicled flaps: nearby tissue with vascular pedicle
  6. Free tissue transfer: distant tissue with microvascular anastomosis

• Defect Analysis Determines Rung

  • Size: small (<3 cm) vs large (>3 cm)
  • Depth: superficial (skin/mucosa) vs deep (bone, muscle)
  • Function: static (coverage) vs dynamic (speech, swallowing)
  • Location: external (cosmesis) vs internal (function)
  • Tissue type: skin, mucosa, bone, soft tissue

💡 Master This: The reconstructive ladder is not prescriptive-complex defects often require skipping rungs to achieve optimal functional and aesthetic outcomes. A through-and-through oral cavity defect demands free flap reconstruction, not a futile attempt at local flaps.

Skin Grafts: Coverage Without Bulk

• Split-Thickness Skin Graft (STSG)

  • Thickness: 0.010-0.015 inches (includes epidermis + partial dermis)
  • Harvest sites: thigh (most common), buttock, back
  • Advantages: large area coverage, donor site heals by re-epithelialization
  • Disadvantages: contracture (10-20%), color mismatch, no hair/sebaceous glands
  • Take rate: >90% on well-vascularized bed
  • Uses: scalp after Mohs, oral cavity lining (rare), temporary coverage

• Full-Thickness Skin Graft (FTSG)

  • Thickness: entire dermis included
  • Harvest sites: postauricular, supraclavicular, groin
  • Advantages: less contracture, better color match, hair-bearing if needed
  • Disadvantages: limited size, donor requires primary closure
  • Take rate: 85-95% (more metabolically demanding)
  • Uses: facial defects after Mohs, eyelid reconstruction

• Graft Survival Requirements

  • Imbibition (0-48 hours): plasma absorption
  • Inosculation (48-72 hours): vessel anastomosis
  • Revascularization (4-7 days): new vessel ingrowth
  • Contraindications: exposed bone/cartilage without periosteum/perichondrium, heavily irradiated bed, active infection

⭐ Clinical Pearl: Skin grafts require immobilization for 5-7 days to allow revascularization-bolster dressings with moderate pressure prevent shearing and seroma formation, which cause graft failure in >50% of cases when present.

Local Flaps: Adjacent Tissue Recruitment

• Rotation Flap

  • Semicircular flap rotates around pivot point
  • Arc length 4-5 times defect width
  • Uses: scalp, cheek defects

• Advancement Flap

  • Tissue slides forward without rotation
  • V-Y advancement: lengthens by releasing back-cut
  • Uses: forehead, upper lip

• Transposition Flap

  • Flap moves over intervening tissue to defect
  • Limberg (rhomboid) flap: 60-degree angles, transfers tension
  • Bilobed flap: two lobes, 90-100 degrees total rotation, nasal tip reconstruction
  • Uses: nasal, cheek, forehead defects

• Interpolation Flap

  • Flap crosses over/under intervening tissue
  • Pedicle division at 2-3 weeks (second stage)
  • Paramedian forehead flap: gold standard for nasal reconstruction
    • Based on supratrochlear artery
    • Can cover entire nasal subunit
    • Pedicle divided at 3 weeks

📌 Remember: RAT-I for local flap types-Rotation (arc), Advancement (slide), Transposition (jump over), Interpolation (bridge across)-each with specific geometric requirements

Regional Pedicled Flaps: Workhorse Reconstructions

• Pectoralis Major Myocutaneous Flap (PMMF)

  • Pedicle: thoracoacromial artery (branch of axillary artery)
  • Arc of rotation: reaches oral cavity, oropharynx, skull base
  • Dimensions: up to 10 × 20 cm skin paddle
  • Advantages: reliable (>95% success), one-stage, no microsurgery
  • Disadvantages: bulky, hair-bearing in men, donor site morbidity
  • Uses: oral cavity, oropharynx, hypopharynx, external coverage, fistula repair

• Deltopectoral Flap

  • Pedicle: perforators from internal mammary artery (1st-4th intercostal spaces)
  • Arc of rotation: reaches lower face, neck, upper chest
  • Disadvantages: requires two stages (pedicle division at 3 weeks), limited reach
  • Uses: pharyngocutaneous fistula, hypopharyngeal reconstruction (historical)

• Temporalis Muscle Flap

  • Pedicle: deep temporal artery (branch of maxillary artery)
  • Arc of rotation: reaches orbit, oral cavity, lateral skull base
  • Advantages: reliable, thin, no facial scar
  • Disadvantages: temporal hollowing, limited bulk
  • Uses: orbital floor, oral cavity, lateral skull base defects

• Submental Artery Flap

  • Pedicle: submental artery (branch of facial artery)
  • Arc of rotation: reaches oral cavity, oropharynx
  • Advantages: thin, pliable, color match, sensate (if include mental nerve)
  • Disadvantages: contraindicated if Level I nodes involved (oncologic concern)
  • Uses: oral tongue, floor of mouth, buccal mucosa

⭐ Clinical Pearl: The pectoralis major flap remains the most reliable regional flap with >95% success rate-despite aesthetic limitations, it serves as the salvage option when free flaps fail, making it an essential technique in every head and neck surgeon's armamentarium.

| Flap Type | Pedicle | Reach | Bulk | Primary Use | Success Rate | |--------