Carcinoma of the Larynx

Slide 1 · Carcinoma of the Larynx

Squamous carcinogenesis, morphology and clinicopathologic interpretation

Dr Abu Suraih Sakhri

MBBS, MD (Pathology)

www.abusuraihsakhri.com

Slide 2 · Learning outcomes

Recognize the predominantly squamous histology and its characteristic risk profile.

Explain the hyperplasia–dysplasia–carcinoma sequence and the meaning of invasion.

Describe gross and microscopic appearances of laryngeal carcinoma.

Connect clinical symptoms and stage with management and prognosis.

Slide 3 · The central disease entity

Squamous cell carcinoma

Laryngeal carcinoma is predominantly squamous cell carcinoma (SCC).

It occurs classically in adults with chronic exposure to tobacco smoke.

The disease links epithelial injury, neoplastic transformation and impaired laryngeal function.

Slide 4 · How predominant is squamous histology?

≈95%

That about 95% of laryngeal carcinomas are SCCs.

Laryngeal SCC therefore anchors the pathology of malignant laryngeal tumors.

The remaining fraction is not further classified in the cited passage.

Slide 5 · Anatomic regions orient the pathology

SUPRAGLOTTIC

Epiglottis / aryepiglottic folds

GLOTTIC

True vocal cords

SUBGLOTTIC

Below the cords

Slide 6 · Vocal cords are the dominant site

True vocal cords

Most laryngeal SCCs arise on the vocal cords.

Small surface lesions here may alter the voice before becoming bulky.

Site description is important when correlating morphology with presentation.

Slide 7 · Origins above, at and below the cords

Region

Site concept

Pathologic relevance

Above the cords

Supraglottic region

Epiglottis and aryepiglottic folds are mentioned

At the cords

Glottic region

True vocal cords: commonest origin

Below the cords

Subglottic region

Laryngeal carcinoma can also arise here

Slide 8 · Pyriform sinus involvement: Anatomic caution

The pyriform sinus among sites involved by tumors in the laryngeal region.

Anatomically, the pyriform sinus belongs to the hypopharynx rather than the larynx proper.

In clinical and pathologic descriptions, distinguish the site of origin from extension to adjacent mucosa.

Slide 9 · Typical age at presentation

Sixth decade

The sixth decade of life as the commonest presenting period.

The overview characterizes affected patients as adult chronic smokers.

The chapter’s summary notes a predominance in older males.

Slide 10 · Tobacco exposure is the principal etiologic link

Chronic exposure

Tobacco smoke

→

Mucosal changes

Repeated epithelial injury and altered differentiation

→

Neoplastic pathway

Dysplasia and subsequent carcinoma

This is a conceptual teaching pathway; The cited section establishes smoking-related risk and epithelial progression, not a quantified molecular mechanism.

Slide 11 · Smoking risk rises with exposure

Dose–risk association

Laryngeal carcinoma is most often related to tobacco smoke.

Risk is proportional to exposure.

An exposure history is therefore central when evaluating a suspicious laryngeal lesion.

Slide 12 · Alcohol amplifies tobacco-associated risk

Tobacco

Principal causal exposure

→

Alcohol

Co-exposure

→

Combined exposure

Risk substantially increased

The source says alcohol synergizes with tobacco; Diagram does not quantify the interaction.

Slide 13 · Additional risk modifiers

Nutritional factors are listed as contributors to cancer risk.

Asbestos exposure and prior irradiation are also listed.

High-risk human papillomavirus (HPV) infection is recognized as an additional risk factor.

The supplied passage does not assign a specific proportion of cases to these exposures.

Slide 14 · Smoking cessation before malignant change

Tobacco-related injury

Nonmalignant epithelial alterations

→

Exposure stopped

Smoking cessation

→

Possible consequence

Regression of epithelial change

Source qualification: Epithelial changes frequently regress BEFORE malignant transformation; This does not imply established carcinoma regresses with cessation.

Slide 15 · Chronic laryngitis is relevant context

Laryngitis may accompany heavy exposure to tobacco smoke.

Persistent irritation can promote squamous epithelial metaplasia.

This background of smoking-related mucosal change to laryngeal carcinoma.

Slide 16 · Multistep squamous carcinogenesis

Hyperplasia

Increased epithelial thickness

→

Dysplasia

Atypical epithelial maturation

→

Carcinoma in situ

Full-thickness malignant cytology without invasion

→

Invasive SCC

Growth beyond the epithelial basement membrane

Definitions for in situ and invasion are general histopathologic interpretation of the source sequence.

Slide 17 · Hyperplasia is not equivalent to cancer

Hyperplasia denotes an increased epithelial cell population or thickness.

Non-dysplastic hyperplasia has almost no potential for malignant transformation in the Robbins passage.

The presence or absence of dysplasia alters interpretation more than surface thickness alone.

Slide 18 · Hyperplasia versus dysplasia

Feature

Nondysplastic hyperplasia

Dysplasia

Fundamental change

Increased epithelial proliferation

Cytologic/architectural atypia

Biological implication

Almost no transformation potential

Risk depends on dysplasia severity

Diagnostic question

Is atypia present?

How extensive/severe is atypia?

Slide 19 · Keratosis is a surface appearance, not a grade

Gross laryngeal mucosa can be roughened by keratosis.

White thickening or a plaque may accompany the epithelial changes.

Surface appearance alone cannot establish the histologic grade of dysplasia.

Slide 20 · Dysplasia requires microscopic assessment

Dysplasia is a histologic alteration along the progression sequence.

Its severity is associated with risk of later carcinoma.

Histology is the only way to grade dysplasia.

Slide 21 · Why severity matters biologically

Initial finding

Transformation interpretation

Practical lesson

Nondysplastic hyperplasia

Almost no transformation potential

Do not equate thickened mucosa with malignancy

Mild dysplasia

Lower but nonzero risk

Grade requires tissue assessment

Severe dysplasia

Higher subsequent risk

Escalation is grounded in histologic grade

Slide 22 · Carcinoma in situ remains above the boundary

EPITHELIUM

STROMA

Basement membrane

No tumor below boundary

Schematic — not a histologic specimen

Carcinoma in situ is a preinvasive neoplastic stage in the sequence.

Atypical epithelial cells remain confined above the basement membrane.

Invasion has not yet been demonstrated.

Slide 23 · Invasion changes the diagnosis

EPITHELIUM

STROMA

Basement membrane

Tumor nests below boundary

Schematic — not a histologic specimen

The transition to invasive carcinoma entails stromal penetration by malignant epithelial cells.

Unlike carcinoma in situ, invasive SCC is no longer confined to the epithelial compartment.

A demonstrable invasive component is a decisive morphologic distinction.

Slide 24 · In situ and invasive SCC: Diagnostic contrast

Question

Carcinoma in situ

Invasive SCC

Are cells malignant?

Yes

Yes

Is the epithelial boundary breached?

No

Yes

Where is the tumor?

Within epithelium

In epithelium and/or underlying stroma

Key interpretive task

Confirm confinement

Identify unequivocal invasion

Slide 25 · Transformation risk increases with dysplasia grade

Reported transformation risk over 5–10 years

0%

2%

4%

6%

8%

10%

Mild dysplasia

1–2%

Severe dysplasia

5–10%

Ranges reproduced from the textbook; Observational context and external validation are not supplied.

Slide 26 · Interpreting the numerical estimates correctly

Mild dysplasia: About 1%–2% risk of transformation over 5–10 years.

Severe dysplasia: About 5%–10% over a comparable period.

The difference illustrates the direction of risk across grades; These are not treatment thresholds.

Slide 27 · A visible plaque has several interpretations

Laryngeal epithelial surfaces may be smooth despite microscopic change.

White or reddened focal thickening may reflect a range of epithelial abnormalities.

Biopsy interpretation, not color alone, resolves the important diagnostic category.

Slide 28 · The gross appearance evolves with progression

Subtle surface change

Smooth mucosa or localized thickening

→

Plaque formation

White / pearly gray, wrinkled mucosa

→

Destructive mass

Ulceration or fungating growth

Schematic teaching progression; Individual lesions do not necessarily follow every illustrated gross stage.

Slide 29 · Four gross descriptions used in the chapter

Focal thickening

Keratosis / plaque

Verrucous surface

Ulcerated / fungating

These are verbal gross patterns, not four mutually exclusive tumor diagnoses.

The same clinical appearance can require histologic confirmation.

Original simplified surface schematics; They are not diagnostic photographs.

Slide 30 · White plaques and altered mucosal texture

Early malignant lesions may manifest as pearly gray, wrinkled mucosal plaques.

White color and surface keratosis describe gross appearance.

These findings do not by themselves distinguish high-grade dysplasia from invasion.

Slide 31 · Roughened and verrucous mucosa

Irregular verrucous or white-pink laryngeal lesions.

The term “verrucous” describes the gross surface pattern in this discussion.

It should not automatically be read as a specific histopathologic SCC variant.

Slide 32 · Ulceration signals tissue destruction

Invasive carcinoma may produce an ulcerated mucosal lesion.

The chapter illustrates a large ulcerated mass involving the right vocal cord and pyriform sinus.

Ulceration raises concern for advanced local growth but cannot independently assign a clinical stage.

Slide 33 · Fungating lesions form bulky exophytic masses

Later lesions may become fungating, projecting into the laryngeal lumen.

Robbins pairs ulceration and fungation in its gross carcinoma example.

Gross tumor size and configuration are distinct from microscopic differentiation.

Slide 34 · Microscopic identity: Invasive squamous carcinoma

The dominant tumor lineage is malignant squamous epithelium.

Histologic differentiation varies substantially between tumors.

Adjacent epithelial dysplasia or carcinoma in situ may coexist.

Slide 35 · Histologic differentiation is variable

Morphologic axis

Better differentiated appearance

More anaplastic appearance

Squamous maturation

More recognizable squamous features

Less orderly squamous differentiation

Cellular appearance

Relatively cohesive tumor cells

Greater cellular/nuclear pleomorphism

Interpretation

Tumor retains more maturation

Tumor demonstrates loss of maturation

Slide 36 · Anaplasia may be striking

Variable atypia

The source describes highly variable degrees of anaplasia.

Marked cytologic atypia does not change the basic diagnosis of SCC.

The severity and pattern of atypia are assessed on tissue sections.

Slide 37 · Tumor giant cells may be present

Robbins explicitly mentions tumor giant cells within the histologic spectrum.

These represent marked cellular atypia in this context.

Their presence should be interpreted with the architecture and other malignant features, not alone.

Slide 38 · Bizarre mitotic figures indicate disordered division

Bizarre mitoses are another feature specifically mentioned in the chapter.

Atypical mitotic morphology supports high-grade neoplastic cytology.

Mitotic atypia must be interpreted alongside invasion and tumor differentiation.

Slide 39 · The adjacent mucosa can be abnormal too

Shared environmental exposure

Repeated carcinogen contact

→

Non-neoplastic neighboring mucosa

Squamous hyperplasia

→

Adjacent premalignant foci

Dysplasia or carcinoma in situ

This is a schematic representation of the source statement regarding adjacent mucosa.

Slide 40 · A single tumor can sit within a broader field

The chapter notes hyperplasia and foci of dysplasia or carcinoma in situ in nearby mucosa.

The surrounding epithelium is therefore informative on pathologic examination.

This supports consideration of both the invasive lesion and associated epithelial changes.

Slide 41 · Gross appearance and histologic grade are different

Gross examination can show

Histology is needed to establish

Color: white, pink, erythematous

Presence and severity of dysplasia

Plaque, keratosis or surface roughening

Carcinoma in situ versus invasive carcinoma

Ulcerated or fungating mass

Squamous differentiation and cellular anaplasia

Slide 42 · Reactive vocal cord nodules mimic some symptoms

Reactive nodules or polyps commonly occur with vocal overuse or smoking.

They often cause hoarseness because of their position and inflammation.

Their malignant transformation risk is almost nonexistent.

Slide 43 · Nodule and polyp: Benign clinical context

Property

Reactive nodule

Reactive polyp

Usual distribution

Bilateral by convention

Unilateral by convention

Typical location

True vocal cord

True vocal cord

Morphologic setting

Reactive, often myxoid stroma

Reactive, often myxoid stroma

Cancer risk

Almost nonexistent

Almost nonexistent

Slide 44 · Squamous papilloma is another exophytic lesion

Laryngeal squamous papillomas are benign neoplasms, often on true vocal cords.

They form soft projections with fibrovascular cores and orderly squamous covering.

Papilloma histology and biologic behavior differ from SCC.

Slide 45 · Papillomatosis is usually low-risk HPV associated

Recurrent laryngeal papillomatosis is associated with HPV types 6 and 11.

It frequently recurs but rarely transforms to SCC.

Robbins particularly associates rare transformation with smoking or radiation exposure.

Slide 46 · Laryngeal surface lesions: Key distinctions

Entity

Core nature

Malignant implication

Reactive nodule / polyp

Non-neoplastic reactive process

Transformation risk nearly absent

Squamous papilloma

Benign HPV-related epithelial neoplasm

Rare malignant transformation

Dysplasia / in situ SCC

Neoplastic epithelial atypia

Risk of / transition toward invasion

Invasive SCC

Malignant squamous epithelial tumor

Established invasive carcinoma

Slide 47 · Do not label every benign lesion “precancer”

Reactive nodules and vocal polyps are not usual obligatory precursors of carcinoma.

Papillomas caused by HPV 6/11 are biologically distinct from typical tobacco-associated SCC.

Dysplastic epithelium is the meaningful precursor in the chapter’s principal cancer pathway.

Slide 48 · Persistent hoarseness is a key warning symptom

Hoarseness

Persistent hoarseness among the common initial manifestations.

A lesion at the vocal cords can change vibratory function early.

Persistent symptoms need attention because benign reactive lesions can also cause hoarseness.

Slide 49 · Dysphonia describes impaired voice production

Dysphonia is listed as a typical presenting symptom of laryngeal carcinoma.

It is clinically related to disrupted laryngeal phonation.

Dysphonia and hoarseness overlap but are not histologic diagnoses.

Slide 50 · Dysphagia suggests functional disturbance

The chapter also lists dysphagia as an initial manifestation.

Its presence links tumor location or extent with swallowing mechanics.

Clinical symptoms require anatomic assessment; They cannot substitute for a tissue diagnosis.

Slide 51 · Link symptoms to the affected function

Manifestation

Functional context

Pathology question

Persistent hoarseness

Vocal-fold vibration

Is the cord surface affected?

Dysphonia

Phonation

How much does the lesion interfere with voice?

Dysphagia

Swallowing

Does the lesion affect neighboring passage/function?

Slide 52 · Symptom patterns do not replace morphology

Hoarseness can arise from benign nodules, polyps or carcinoma.

Gross appearance helps direct attention to a suspicious region.

The histologic distinction among reactive change, dysplasia and invasive SCC remains decisive.

Slide 53 · Clinical stage is the central prognostic variable

Clinical stage

Robbins directly relates prognosis to clinical stage.

More advanced disease generally requires more complex treatment.

The cited source does not specify a TNM edition or detailed stage-group definitions.

Slide 54 · Treatment intensity reflects disease extent

Clinical context

Approaches named by Robbins

General therapeutic aim

Early disease

Laser surgery, microsurgery or radiotherapy

Organ preservation where feasible

Advanced or recurrent disease

Combined chemotherapy and radiotherapy ± laryngectomy

Control more extensive disease

Slide 55 · Organ-preserving treatment in early disease

Increasing use of organ-preserving approaches.

Laser surgery and microsurgery are specifically listed.

Radiotherapy is another stated option in the early-disease setting.

Slide 56 · Advanced or recurrent disease needs escalation

Combined chemotherapy and radiation are typical options in advanced or recurrent disease.

Laryngectomy may or may not be incorporated according to clinical context.

The textbook section does not supply a treatment algorithm for individual stages.

Slide 57 · Cancer control and voice preservation may conflict

Functional cost

The larynx is central to production of the natural voice.

Tumors may be resectable at the price of loss of natural voice.

Treatment discussions therefore address both oncologic outcome and function.

Slide 58 · Case 1 — persistent change in voice

An adult with a long tobacco exposure history reports progressive persistent hoarseness. A focal lesion is seen on a true vocal cord.

What are the two most important interpretive steps?

Consider laryngeal SCC among the causes, without assuming malignancy.

Characterize the lesion and obtain histologic assessment to distinguish reactive change, dysplasia and carcinoma.

Slide 59 · Case 2 — a white vocal-fold plaque

A white, roughened laryngeal plaque is biopsied. The question is whether epithelial atypia is present and whether invasion can be identified.

Why is the surface color not sufficient?

Grossly white/keratotic lesions can have different epithelial abnormalities.

Histology establishes dysplasia grade and distinguishes in situ from invasive carcinoma.

Slide 60 · Case 3 — large ulcerated mass

A patient has an ulcerated, exophytic lesion involving a vocal cord and neighboring mucosa. Histology shows markedly atypical malignant squamous cells.

Which findings are established, and what remains to be assessed?

The described morphology supports a malignant squamous lesion; Tissue evaluation defines invasion.

The extent of disease must be clinically staged to guide prognosis and treatment.

Slide 61 · Integrated clinicopathologic interpretation

Domain

Principal finding

Why it matters

Etiology

Chronic smoking; alcohol synergy

Frames risk assessment

Pathogenesis

Dysplasia → in situ → invasion

Identifies the malignant transition

Morphology

Plaque → ulcerated/fungating mass; variable atypia

Explains gross and microscopic spectrum

Clinical

Persistent hoarseness, dysphonia, dysphagia

Links site to functional effect

Prognosis

Clinical stage

Shapes treatment intensity and outcome

Slide 62 · Five essential conclusions

Most laryngeal carcinomas are squamous and strongly associated with tobacco exposure.

A dysplastic precursor can progress through carcinoma in situ to invasive SCC.

Lesion color or keratosis alone cannot establish dysplasia grade.

Persistent hoarseness is clinically important but not specific for carcinoma.

Clinical stage governs prognosis and the broad treatment approach.

Slide 63 · Core references

Robbins, Cotran & Kumar. Pathologic Basis of Disease. 11th edition (2026).

Relevant source sections: Larynx; Carcinoma of the Larynx; Hyperplasia–Dysplasia–Carcinoma Sequence.

Contextual comparisons: Reactive Nodules (Vocal Cord Nodules and Polyps); Squamous Papilloma and Papillomatosis.