Hyperplasia Dysplasia Carcinoma Sequence

Slide 1 · Hyperplasia–Dysplasia–Carcinoma Sequence

Laryngeal squamous epithelium: precursor morphology, risk and clinical significance

Dr Abu Suraih Sakhri

MBBS, MD (Pathology)

www.abusuraihsakhri.com

Slide 2 · Learning objectives

Distinguish hyperplasia, dysplasia, carcinoma in situ, and invasive carcinoma.

Interpret visible laryngeal lesions without equating color or texture with histologic grade.

Relate tobacco, alcohol and other exposures to epithelial change and cancer risk.

Apply biopsy findings, progression-risk estimates and clinical stage to case interpretation.

Slide 3 · The spectrum is epithelial, not merely gross

Hyperplasia

Dysplasia

Carcinoma in situ

Invasive carcinoma

A morphologic spectrum; Progression is not inevitable in every lesion

An individual lesion cannot be placed on this continuum reliably by laryngoscopic appearance alone.

Biopsy provides the histologic information needed to assess dysplasia.

Slide 4 · Four terms answer different questions

Term

What changes?

Key distinction

Hyperplasia

Epithelial cell number / thickness

Orderly growth may remain nondysplastic

Dysplasia

Cellular atypia and disordered maturation

Premalignant change with variable risk

Carcinoma in situ

Full-thickness severe atypia

Basement membrane remains intact

Invasive carcinoma

Malignant growth extends into stroma

Basement membrane breached

Slide 5 · The basement membrane is the critical boundary

Dysplasia and carcinoma in situ remain confined to the epithelial compartment.

Invasive carcinoma crosses the basement membrane into underlying tissue.

Surface irregularity alone cannot establish whether invasion has occurred.

INVASIVE

Schematic · not histology

Slide 6 · Normal epithelium has orderly maturation

Basal epithelial cells mature as they move toward the surface.

Nuclear and cytoplasmic patterns vary in an orderly manner through the epithelial thickness.

Mitoses are ordinarily concentrated toward the basal compartment.

NORMAL

Schematic · not histology

Slide 7 · Metaplasia is not synonymous with dysplasia

Alteration

Definition

Implication

Metaplasia

Replacement of one differentiated cell type by another

Adaptive response; not necessarily dysplastic

Dysplasia

Disordered epithelial maturation with cytologic atypia

A premalignant morphologic change

Carcinoma in situ

Severe full-thickness epithelial atypia without invasion

Preinvasive carcinoma

Slide 8 · Squamous metaplasia can follow chronic injury

Chronic smoking-associated laryngitis with squamous epithelial metaplasia.

A metaplastic epithelium can remain orderly or can subsequently show dysplastic change.

Metaplasia and dysplasia must not be reported as interchangeable diagnoses.

Important distinction

An adaptive cell-type change is not, by itself, a histologic diagnosis of cancer.

Slide 9 · Hyperplasia means increased epithelial growth

The laryngeal sequence may begin with epithelial thickening.

Cell layering can increase without the disordered maturation characteristic of dysplasia.

Hyperplasia is therefore a morphologic descriptor, not automatically a premalignant lesion.

HYPERPLASIA

Schematic · not histology

Slide 10 · Nondysplastic hyperplasia carries very low risk

Almost no malignant-transformation potential for nondysplastic laryngeal hyperplasias.

This statement applies to the histologic category, not to an unbiopsied white plaque.

Sampling and pathologic interpretation determine whether dysplasia is absent.

Risk interpretation

Visible thickening does not establish nondysplastic histology.

Slide 11 · Dysplasia denotes disordered epithelial growth

Cellular atypia and loss of orderly differentiation define the concept.

Dysplastic changes predominantly affect epithelial cells.

Grade helps estimate subsequent malignant-transformation risk.

MILD

Schematic · not histology

Slide 12 · Cytologic clues to dysplasia

Pleomorphism: Variability in cellular and nuclear shape.

Larger, hyperchromatic nuclei and increased nuclear-to-cytoplasmic ratio.

These changes must be interpreted in their tissue architecture.

Microscopic reasoning

Atypical nuclei must be interpreted with epithelial maturation and mitotic distribution.

Slide 13 · Loss of maturation is an architectural clue

Normal stratification shows progressive maturation from basal to superficial cells.

Dysplasia disrupts that gradient, partially or extensively.

The degree of architectural disorder contributes to the histologic impression.

SEVERE

Schematic · not histology

Slide 14 · Mitotic distribution changes with dysplasia

Normal squamous epithelium predominantly shows mitoses near the basal layer.

Dysplastic epithelium may show increased mitotic figures at higher levels.

Atypical mitoses reinforce malignant cytologic concern but do not alone define invasion.

Correlation

Assess nuclear features, architecture and mitoses together.

Slide 15 · Dysplasia grade is a histologic assessment

Robbins relates transformation risk to the initial grade of dysplasia.

Gross surface color and thickness cannot establish a reliable grade.

Only histologic evaluation can grade dysplasia.

Key diagnostic rule

Laryngoscopy identifies a lesion; Tissue evaluation characterizes its dysplastic grade.

Slide 16 · Mild dysplasia: Lower but nonzero risk

Mild dysplasia is a histologic precursor category with relatively low transformation risk.

Robbins gives a 1%–2% example over 5–10 years.

Low risk must not be misconstrued as zero risk or as a prediction for an individual patient.

MILD

Schematic · not histology

Slide 17 · Severe dysplasia: Higher transformation risk

The initial severe dysplasia category carries greater malignant-transformation risk.

Robbins provides an illustrative 5%–10% estimate.

A severe biopsy result warrants different concern from nondysplastic hyperplasia.

SEVERE

Schematic · not histology

Slide 18 · Quantitative risk must retain its context

Mild dysplasia

1%–2%

Over 5–10 years example

Severe dysplasia

5%–10%

Higher risk in the same source discussion

These figures are source-reported examples, not a personalized risk calculator.

Do not treat grade-associated risk as proof that a given lesion will progress.

Slide 19 · Dysplasia does not imply inevitable progression

Exposure

Epithelial injury

Dysplastic change

Possible outcomes

Possible outcomes include persistence, regression, or progression

Dysplasia can regress when inciting causes are removed.

Premalignant morphology indicates potential for progression, not deterministic fate.

Slide 20 · Carcinoma in situ is preinvasive cancer

Severe atypia involves the entire epithelial thickness.

The basement membrane is not penetrated.

The boundary between in situ and invasive disease is a tissue relationship, not a surface-color distinction.

CARCINOMA IN SITU

Schematic · not histology

Slide 21 · Invasive carcinoma crosses into stroma

Malignant squamous epithelium extends beyond the basement membrane.

The distinction requires attention to the epithelial–stromal interface.

Invasion fundamentally changes the pathologic category.

INVASIVE

Schematic · not histology

Slide 22 · Adjacent mucosa may show precursor change

Laryngeal SCC may coexist with squamous hyperplasia, dysplasia or carcinoma in situ in nearby mucosa.

Repeated carcinogen exposure can affect a mucosal region rather than one isolated point.

This observation supports careful evaluation of surrounding epithelium in specimens.

Tissue context

Neoplastic and non-neoplastic epithelial changes may coexist within the same specimen.

Slide 23 · Repeated carcinogen exposure is central

Repeated exposure

Epithelial alteration

Possible progression

The pathologic spectrum occurs in a tissue repeatedly exposed to environmental insults.

Slide 24 · Tobacco is the dominant exposure

Laryngeal carcinoma is most often related to tobacco smoke.

Risk increases with exposure.

A history of chronic smoking is a major clinical context, not a histologic diagnosis.

Tobacco-associated risk

Greater exposure is associated with greater cancer risk.

Slide 25 · Alcohol and tobacco act synergistically

Tobacco smoke

Alcohol use

Synergistic cancer risk

The combined exposure increases cancer risk substantially beyond either exposure considered alone.

Slide 26 · Other factors can contribute to risk

Exposure

Source-supported relationship

Interpretive limit

Nutritional factors

May increase laryngeal cancer risk

Robbins does not quantify effect here

Asbestos exposure

May increase risk

No effect estimate supplied

Irradiation

May increase risk

Depends on clinical context

High-risk HPV infection

May increase risk

Do not conflate with HPV 6/11 papillomas

Slide 27 · Smoking cessation may reverse precursor change

Stop exposure

Reduced ongoing injury

Possible epithelial regression

Smoking cessation acts on the initiating exposure

Before malignant transformation, epithelial abnormalities often regress after tobacco cessation.

Reversal is possible, not guaranteed, and does not replace histologic assessment of suspicious lesions.

Slide 28 · Do not infer gene pathways from appearance

Squamous carcinogenesis to accumulating molecular changes across time.

The selected laryngeal section does not specify a gene-by-gene molecular sequence.

A schematic continuum must not be mistaken for a universal ordered mutation pathway.

Scope control

Morphologic progression is supported; A deterministic molecular timeline is not specified by this excerpt.

Slide 29 · Visible epithelium has several appearances

Smooth focal thickening

White rough keratosis

Irregular / ulcerated lesion

Clinical morphology is variable even within the laryngeal precursor spectrum.

Slide 30 · Smooth thickening is nonspecific

Focal mucosal thickening is part of the reported clinical spectrum.

Smooth appearance cannot demonstrate histologic absence of dysplasia.

A lesion must be interpreted with history, examination and tissue findings.

Surface versus tissue

A smooth surface is not the same as an orderly microscopic epithelium.

Slide 31 · White mucosa may reflect keratosis

White, roughened laryngeal surfaces associated with keratosis.

White color describes a gross finding; It does not grade the epithelium.

Histologic assessment distinguishes orderly keratinizing change from dysplasia.

Interpretive caution

Gross leukoplakic appearance does not map one-to-one onto a single histologic diagnosis.

Slide 32 · Red mucosa also lacks specific grade information

The source describes focal erythematous laryngeal surfaces.

Redness may prompt examination but cannot independently diagnose carcinoma.

The same diagnostic rule applies: The histologic compartment and atypia matter.

Visible appearance

Surface color cannot establish whether the basement membrane has been breached.

Slide 33 · Irregular and verrucous surfaces raise concern

Smooth

Rough / keratotic

Irregular / verrucous

Laryngeal lesions may be irregular, verrucous or white-pink.

Exophytic architecture must be separated from microscopic cellular atypia.

Slide 34 · Ulcerated fungating masses mark advanced morphology

Plaque-like change

Surface irregularity

Ulcerated mass

Laryngeal carcinoma as an ulcerated, fungating lesion.

This pattern is worrisome for invasive malignancy but requires tissue confirmation.

Slide 35 · The gross sequence is illustrative, not obligatory

Epithelial change

Pearly-gray plaque

Ulcerated mass

Typical appearance described; Not an inflexible chronology

Lesions evolving from wrinkled pearly-gray plaques to larger ulcerated masses.

Individual tumors need not traverse visibly documented intermediate steps.

Slide 36 · Histology answers what the surface cannot

Clinical observation

Cannot establish

Histologic evaluation addresses

White / keratotic lesion

Dysplasia grade

Cytologic atypia and maturation

Red or smooth lesion

Benignity

Architecture and dysplastic change

Irregular mass

Presence of invasion

Basement-membrane interface

Slide 37 · The most common histologic tumor is SCC

Approximately 95% of laryngeal carcinomas are squamous cell carcinomas.

The remainder are not characterized by this short source excerpt.

Avoid assuming that every laryngeal tumor is a squamous carcinoma.

~95%

Squamous cell carcinomas account for about 95% of laryngeal carcinomas.

Slide 38 · Laryngeal SCC has several anatomic sites

Supraglottic

Epiglottis / aryepiglottic folds

Glottic

True vocal cords

Subglottic

Below vocal cords

Simplified regional map — not a scale anatomical drawing

Slide 39 · Vocal cords are a frequent primary site

Most laryngeal SCCs arise on the vocal cords.

Tumors can also develop above or below the cords.

Other sites discussed include the epiglottis, aryepiglottic folds and pyriform sinuses.

Anatomic site matters

Most arise on vocal cords, but supraglottic and subglottic sites also occur.

Slide 40 · Histologic differentiation varies widely

Variable degrees of anaplasia in laryngeal SCC.

The tissue may show markedly atypical malignant squamous cells.

Do not infer histologic grade solely from the size or ulceration of a mass.

Morphology

Anaplasia describes loss of differentiation, not clinical stage.

Slide 41 · Bizarre mitoses and giant cells may occur

The source identifies bizarre mitotic figures and tumor giant cells as possible findings.

Their presence reflects atypical tumor-cell morphology.

Absence of a particular atypical feature would not exclude malignancy.

Cytology in context

Cellular atypia is interpreted with the invasive growth pattern.

Slide 42 · The in situ–invasive boundary is practical

CARCINOMA IN SITU

Schematic · not histology

INVASIVE

Schematic · not histology

NORMAL

Schematic · not histology

CIS is confined to the epithelial compartment; Invasive SCC extends beyond it.

Slide 43 · Reactive vocal-cord nodules are a benign mimic

Feature

Reactive nodule / polyp

Concern in precursor-neoplastic lesions

Typical context

Voice strain or smoking

Tobacco-linked epithelial neoplasia

Gross

Small smooth protrusion

Variable plaque, verrucous, ulcerated mass

Biology

Almost nonexistent cancer risk in nodules

Risk depends on epithelial dysplasia grade

Slide 44 · Nodules show reactive stromal change

The covering squamous epithelium may be hyperkeratotic or hyperplastic.

Robbins also notes occasional slight dysplasia over a loose myxoid stroma.

Fibrosis, fibrinous change or vascularity may be present in the underlying stroma.

Distinguishing context

A reactive subepithelial stromal lesion differs from a primarily dysplastic epithelial lesion.

Slide 45 · Squamous papilloma has a different architecture

Laryngeal papilloma is a benign exophytic squamous neoplasm.

Finger-like fronds contain fibrovascular cores and orderly squamous covering.

It is usually located on the true vocal cords and is often small.

Architectural discriminator

An orderly papillomatous epithelium is not equivalent to invasive squamous carcinoma.

Slide 46 · HPV 6/11 papillomatosis differs from HPV risk

Feature

Laryngeal papillomatosis

Carcinoma risk discussion

HPV category

Low-risk HPV 6 and 11

High-risk HPV may contribute to cancer risk

Usual diagnosis

Benign squamous papilloma

Dysplasia / invasive SCC are distinct histologies

Progression

Recurs often; rarely becomes SCC

Risk varies with precursor histology

Slide 47 · A lesion’s appearance does not identify its cause

Finding

Possibilities supported by surrounding section

What resolves the distinction

Hoarseness

Nodule, papilloma, epithelial lesion or SCC

Clinical evaluation and tissue when indicated

Exophytic growth

Papilloma or carcinoma

Histologic architecture and atypia

Keratosis

Reactive thickening or dysplasia

Biopsy to determine the epithelial category

Slide 48 · Clinical presentation can start with hoarseness

Persistent hoarseness is a common early manifestation of laryngeal carcinoma.

A vocal-cord lesion can disturb vibratory function and alter voice.

Persistent symptoms warrant clinical attention; They do not establish carcinoma by themselves.

Persistent hoarseness

A symptom that should be correlated with examination and tissue findings.

Slide 49 · Dysphonia and dysphagia add clinical context

Dysphonia describes alteration of voice production.

Dysphagia describes impaired swallowing.

Both are among the manifestations listed for laryngeal carcinoma.

Clinical synthesis

Symptoms describe function; Histology describes the tissue diagnosis.

Slide 50 · Cancer often presents in the sixth decade

Laryngeal carcinoma most commonly presents in the sixth decade of life.

Clinical context includes chronic tobacco exposure and, frequently, alcohol exposure.

Age and exposure raise or lower suspicion but are not substitutes for pathology.

Clinical epidemiology

The source states a common age range, not a diagnostic age cutoff.

Slide 51 · Dysplasia grade and cancer stage are different

Variable

Asks

Clinical use

Dysplasia grade

How abnormal is the intraepithelial lesion?

Source links grade with transformation risk

Histologic invasion

Have malignant cells entered underlying tissue?

Distinguishes in situ from invasive carcinoma

Clinical stage

How far has established carcinoma extended?

Robbins ties prognosis to stage

Slide 52 · Stage drives carcinoma prognosis

For established laryngeal carcinoma, prognosis is directly related to clinical stage.

Severity of epithelial dysplasia should not be substituted for tumor stage.

The supplied chapter does not provide a staging table, so no TNM criteria are asserted here.

Prognostic hierarchy

Precursor risk, invasion status and clinical stage answer different clinical questions.

Slide 53 · Early disease can allow organ preservation

Robbins mentions laser surgery, microsurgery and radiation therapy in early disease.

These treatment approaches are discussed for established carcinoma, not as an automatic treatment rule for every keratotic plaque.

Clinical management depends on the actual diagnosis and stage.

Treatment context

Treatment choice follows confirmed disease and appropriate staging.

Slide 54 · Advanced disease often requires combined therapy

Chemoradiation, with or without laryngectomy, for more advanced or recurrent disease.

Loss of natural voice is an important possible consequence of surgical treatment.

This slide summarizes the textbook context; It is not an individualized regimen.

Stage-sensitive care

Different disease extents require different treatment strategies.

Slide 55 · Three diagnostic questions prevent category errors

Dysplasia?

Invasion?

Clinical stage?

A sequence of interpretive questions, not a clinical guideline

First: Is the epithelium orderly or dysplastic?

Second: If malignant, is the basement membrane intact?

Third: If invasive carcinoma, what is its clinical stage?

Slide 56 · Case A: A persistent white vocal-cord plaque

Illustrative case: An adult smoker has persistent hoarseness and an endoscopically white focal thickening of the true vocal cord. No biopsy information is supplied.

What can be concluded from the evidence given?

Can this lesion be called mild dysplasia because it is white and thin?

Can a benign grade be assumed from its smooth margin?

Slide 57 · Case A: Appearance alone cannot assign grade

The gross description is compatible with several epithelial categories.

Neither white color nor smooth contour establishes a histologic grade.

The decisive missing observation is tissue architecture and cytology.

Answer

Do not diagnose or grade dysplasia from the visible plaque alone.

Slide 58 · Case B: Severe dysplasia without invasion

Illustrative case: A laryngeal biopsy is reported as severe squamous dysplasia, without demonstrated stromal invasion. The person has ongoing tobacco exposure.

What can be concluded from the evidence given?

Does severe dysplasia prove the patient already has invasive carcinoma?

How should the grade-specific progression risk be interpreted?

Slide 59 · Case B: A high-risk precursor is not invasion

Severe dysplasia carries increased future transformation risk.

Without documented invasion, the biopsy is not evidence of invasive SCC.

Exposure reduction may matter, but histologic assessment remains essential.

Answer

Risk of progression and present invasive disease are distinct questions.

Slide 60 · Case C: Tumor nests beyond the epithelial border

Illustrative case: A biopsy shows markedly atypical squamous epithelial cells in nests beneath the basement membrane, in the subepithelial stroma.

What can be concluded from the evidence given?

What is the decisive morphologic distinction from carcinoma in situ?

Does the biopsy alone supply the complete clinical stage?

Slide 61 · Case C: Tissue invasion changes the diagnosis

Extension into stroma indicates invasive carcinoma rather than in situ disease.

Clinical staging requires information beyond the presence of microscopic invasion.

Prognosis should be linked to clinical stage rather than a precursor dysplasia grade.

Answer

Invasion is established histologically; Clinical stage remains a separate assessment.

Slide 62 · High-yield synthesis

Question

Key finding

Avoid this error

Which lesion has near-zero potential?

Histologically nondysplastic hyperplasia

Calling a white plaque nondysplastic by sight

What predicts transformation risk?

Initial dysplasia grade

Assuming progression is inevitable

What defines in situ disease?

Full-thickness atypia without BM breach

Equating severe dysplasia with stromal invasion

What drives carcinoma prognosis?

Clinical stage

Treating precursor grade as TNM stage

Slide 63 · Source framework and limitations

Primary source: Robbins, Cotran & Kumar, Pathologic Basis of Disease, 11th ed. (2026), Chapter 16, pp. 675–677.

Supporting definitions: Chapter 7, “Metaplasia, Dysplasia, and Carcinoma In Situ.”

The textbook excerpt supplies example transformation risks but not a complete grading algorithm or TNM staging system.

All epithelium, surface and process diagrams are editable educational schematics, not photomicrographs.