Benign Tumors and Tumor Like Conditions

Slide 1 · Benign Tumors and

Tumor-Like Conditions

Vascular ectasias · Hemangiomas · Lymphangiomas

Dr Abu Suraih Sakhri

MBBS, MD (Pathology)

www.abusuraihsakhri.com

Slide 2 · Learning outcomes

Differentiate vascular ectasias from benign vascular neoplasms.

Recognize the defining morphology and natural history of hemangioma variants.

Explain clinically important syndromic associations and bleeding risks.

Distinguish blood-vessel from lymphatic proliferations.

Slide 3 · The benign vascular lesion family

Vascular ectasias: Dilation of preexisting vessels.

Hemangiomas: Blood-vessel tumors with capillary or cavernous patterns.

Lymphangiomas: Benign lymphatic vascular lesions.

Reactive proliferations may resemble neoplasms.

Structural categories

Vascular ectasias

Hemangiomas

Lymphangiomas

Original schematic — not a histologic or clinical image

Slide 4 · Cell of origin determines the lesion

Endothelial lesions include hemangiomas and lymphangiomas.

Support-cell tumors are distinct: Glomus tumor arises from modified smooth muscle cells.

Morphologic overlap does not imply identical lineage.

Vascular / perivascular cells

Endothelium

Modified smooth

Muscle cell

Hemangioma

Lymphangioma

Glomus tumor

(next topic)

Original schematic — not a histologic or clinical image

Slide 5 · Benign vascular architecture

Recognizable lumina are lined by a single layer of bland endothelial cells.

Blood-filled channels and lymph-filled spaces need different interpretation.

The arrangement of channels is central to histologic classification.

Endothelial-lined vascular lumina

Original schematic — not a histologic or clinical image

Slide 6 · Why the malignant boundary matters

Benign: Organized vascular channels lined by relatively normal endothelial cells.

Malignant: More solid proliferation, atypical endothelial cells, poorly organized vessels.

Endothelial immunostains (e.g., CD31 or von Willebrand factor) may be needed in difficult tumors.

Benign pattern

Well-formed vascular lumina

Bland endothelial lining

Architectural organization

Malignant pattern

Often poorly formed lumina

Cytologic atypia

More solid cellular growth

Slide 7 · Ectasia, telangiectasia, neoplasm

An ectasia is localized dilation; Telangiectasia specifically affects small preexisting vessels.

Telangiectasias form visible red lesions of skin or mucous membranes.

Vascular ectasias are congenital or acquired, but not true neoplasms.

Dilation

Preexisting vessels enlarge

No neoplastic designation

May be congenital or acquired

Proliferation

Vascular channels constitute a tumor

Hemangioma/lymphangioma category

Growth pattern depends on subtype

Slide 8 · Vascular dilation: The organizing concept

Capillaries, venules, or arterioles become permanently widened.

Visible lesion formation reflects enlarged superficial vascular spaces.

Small-vessel involvement explains the characteristic red surface appearance.

Schematic cross-sections

Normal vessel

Dilated vessel

Original schematic — not a histologic or clinical image

Slide 9 · Nevus flammeus: Identifying features

A flat, light-pink to deep-purple vascular birthmark.

Typically affects head or neck.

It is the commonest form of vascular ectasia in the Robbins description.

The lesion represents dilated vessels rather than a true neoplasm.

Slide 10 · Nevus flammeus: Natural history

Many ordinary nevi flammei ultimately regress spontaneously.

A persistent port-wine subtype must be distinguished from lesions that fade.

Observed course is therefore an important clinical discriminator.

Flat vascular patch

Follow clinical course

Regression OR persistence

Slide 11 · Port-wine stain is a persistent subtype

Port-wine stain is a form of nevus flammeus.

Unlike many other nevi flammei, it tends to enlarge during childhood.

Overlying skin may thicken and the lesion can persist over time.

Patch that persists and thickens

Dermal vascular dilation

Original schematic — not a histologic or clinical image

Slide 12 · Port-wine progression is not tumor invasion

The surface may change from a flat stain to thickened skin.

This progression is described for the persistent vascular malformation.

Increasing thickness does not, by itself, make the lesion a malignant neoplasm.

Flat red-purple stain

Childhood growth

Persistent thickening

Slide 13 · Port-wine stains and GNAQ

Most port-wine stains, including Sturge–Weber-associated lesions, have somatic gain-of-function GNAQ mutations.

GNAQ encodes an α subunit of a heterotrimeric transmembrane signaling molecule.

The change is acquired in somatic tissue, not described as the inherited mechanism of HHT.

Somatic GNAQ gain-of-function

Abnormal vascular signaling

Port-wine vascular malformation

Slide 14 · Recognizing Sturge–Weber association

A port-wine nevus in trigeminal-nerve distribution can signal Sturge–Weber syndrome.

The syndrome is also termed encephalotrigeminal angiomatosis.

The facial lesion is a clue to possible associated leptomeningeal vascular abnormalities.

Anatomic association — schematic

Facial port-wine region

Original schematic — not a histologic or clinical image

Slide 15 · Sturge–Weber: Extracutaneous disease

Ipsilateral venous angiomas may occur in the cortical leptomeninges.

Reported consequences include seizures, hemiplegia and intellectual disability.

Skull radiopacities are part of the textbook-described picture.

Clinicopathologic connection

Facial vascular malformation

Leptomeningeal venous angiomas

Neurologic manifestations

Slide 16 · Case: Child with facial vascular lesion

Hypothetical teaching case

A child has a large persistent facial port-wine stain in trigeminal distribution and recurrent seizures.

Question: What associated congenital vascular disorder should be considered?

Reasoning: A cutaneous distribution may point to an ipsilateral intracranial vascular abnormality.

Discussion prompt: Identify the lesion and the decisive clues.

Slide 17 · Spider telangiectasia: Vessel arrangement

A central vascular core is surrounded by radial dilated arteriolar branches.

The pattern resembles a spider body with radiating legs.

These are nonneoplastic vascular malformations.

Central core with radial vessels

Radial arteriolar pattern

Original schematic — not a histologic or clinical image

Slide 18 · Spider telangiectasia: Bedside clue

Radial arteriolar lesions are often pulsatile.

They blanch under pressure.

The blanching response and characteristic radial pattern help clinical recognition.

Blanching with pressure

Pressure causes blanching

Original schematic — not a histologic or clinical image

Slide 19 · Spider telangiectasia: Where and when

Typical regions: Face, neck and upper chest.

Common association: Hyperestrogenic states.

Examples: Pregnancy and cirrhosis.

The association should not be mistaken for proof of either condition.

Slide 20 · Case: Radial red lesion of the upper chest

Hypothetical teaching case

A pregnant patient develops a red blanchable lesion with a central focus and radiating vascular branches.

Question: Which benign tumor-like lesion is most consistent?

Reasoning: The radial arteriolar arrangement is more informative than size alone.

Discussion prompt: Identify the lesion and the decisive clues.

Slide 21 · Hereditary hemorrhagic telangiectasia

Also called Rendu–Osler–Weber disease.

An autosomal dominant vascular malformation disorder.

The abnormal vessels include dilated capillaries and veins.

Mucosal and visceral distribution explains the clinical prominence of bleeding.

Slide 22 · HHT: Endothelial signaling defect

Loss-of-function mutations affect components of endothelial TGF-β signaling.

The resulting disorder is associated with widespread malformed vascular channels.

Unlike port-wine stains, the defining Robbins pattern is autosomal dominant inheritance.

Inherited pathway loss of function

Endothelial TGF-β signaling altered

Telangiectatic malformations

Slide 23 · HHT: Distribution is multisystem

Malformations involve skin and oral mucous membranes.

Visceral sites include respiratory, gastrointestinal and urinary tracts.

Multiple locations create multiple potential sites for hemorrhage.

Anatomic checklist

Skin / mouth

Respiratory tract

Gastrointestinal tract

Urinary tract

Slide 24 · HHT: Rupture explains morbidity

Fragile dilated vessels may rupture spontaneously.

Clinically serious epistaxis is possible.

Gastrointestinal bleeding and hematuria are other consequences.

Dilated capillaries / veins

Spontaneous rupture

Epistaxis · GI bleeding · hematuria

Slide 25 · Case: Recurrent nosebleeds and red lesions

Hypothetical teaching case

A patient with affected relatives has telangiectasias of the oral mucosa and recurrent spontaneous epistaxis.

Question: Which inherited vascular disorder unifies the findings?

Reasoning: Inheritance, multi-site ectasias and bleeding distinguish the syndrome.

Discussion prompt: Identify the lesion and the decisive clues.

Slide 26 · Three ectasias: A diagnostic comparison

Feature

Nevus flammeus / port-wine

Spider telangiectasia

HHT

Pattern

Flat red-purple patch

Central core + radial branches

Widespread telangiectasias

Course / setting

Regression or persistent thickening

Hyperestrogenic states

Autosomal dominant

Complication / link

Sturge–Weber subset

Blanches with pressure

Spontaneous hemorrhage

Slide 27 · Hemangiomas: Defining concept

Very common tumors made of blood-filled vascular channels.

Them as the most common tumor of infancy and childhood.

Many begin early, enlarge initially and later regress.

Malignant transformation is rare.

Slide 28 · Hemangioma: Favored sites and extent

Frequently occur in head, neck and thoracic skin.

Can also arise in internal organs.

More extensive disease is termed angiomatosis in the source.

Site distribution (schematic)

Head / neck / thoracic skin; Internal sites

Original schematic — not a histologic or clinical image

Slide 29 · Internal hemangiomas: The liver

Nearly one-third of internal lesions occur in the liver.

Internal location can change how a lesion is detected or investigated.

The benign nature of the entity should be separated from complications of site and extent.

Slide 30 · Major hemangioma forms

Capillary hemangioma: Small, thin-walled capillary-size channels.

Cavernous hemangioma: Large, dilated blood-filled spaces.

Pyogenic granuloma: Rapidly growing capillary hemangioma variant.

Juvenile hemangioma: Distinctive early childhood clinical course.

Clinical / morphologic patterns

Capillary

Juvenile

Cavernous

Pyogenic granuloma

Original schematic — not a histologic or clinical image

Slide 31 · Capillary hemangioma: Typical sites

Skin and subcutaneous tissue are frequent sites.

Also present in lips and oral mucosal surfaces.

Visceral examples include liver, spleen and kidney.

Microscopic architecture is a proliferation of thin-walled capillaries.

Slide 32 · Capillary hemangioma: Microscopy

Numerous delicate thin-walled capillary channels form the lesion.

The intervening stroma is scant.

This is the smaller-channel end of the hemangioma morphologic spectrum.

Small vascular channels

Original schematic — not a histologic or clinical image

Slide 33 · Juvenile hemangioma: Initial phase

Juvenile “strawberry-type” lesions occur in newborn skin.

They may be multiple.

They typically grow rapidly for several months.

Course

Present very early in life

Early rapid growth

Later fading and involution

Slide 34 · Juvenile hemangioma: Regression

Red lesions typically fade during early childhood.

Fading by 1–3 years.

Most completely regress by age 7 years.

Rapid early growth

Fading by 1–3 years

Most regress by age 7

Slide 35 · Juvenile vs cavernous: Course differs

Juvenile hemangiomas commonly undergo spontaneous regression.

Cavernous hemangiomas, in contrast, generally do not.

The distinction changes expectations when counseling about natural history.

Juvenile

Rapid early growth

Fades in early childhood

Most regress by age 7

Cavernous

Often deep or infiltrative

Spontaneous regression absent

May persist and cause local effects

Slide 36 · Cavernous hemangioma: Architecture

Large, dilated blood-filled vascular spaces are characteristic.

Spaces are separated by connective tissue stroma.

At low magnification the lesion is often sharply demarcated but lacks a capsule.

Dilated blood-filled spaces

Original schematic — not a histologic or clinical image

Slide 37 · Cavernous hemangioma: Growth pattern

Compared with capillary variants, cavernous hemangiomas are more infiltrative.

They frequently involve deep structures.

A well-defined gross border does not guarantee an encapsulated tumor.

Unencapsulated interface with tissue

Tumor spaces reach surrounding tissue

Original schematic — not a histologic or clinical image

Slide 38 · Thrombosis and dystrophic calcification

Blood can thrombose within the cavernous vascular spaces.

Dystrophic calcification may follow intravascular thrombosis.

These findings help explain structural heterogeneity within one benign lesion.

Cavernous vascular spaces

Intravascular thrombus

Dystrophic calcification

Slide 39 · Cavernous lesions: Local consequences

Usually limited clinical significance in many superficial locations.

Possible cosmetic disfigurement.

Susceptible to trauma-related ulceration and bleeding.

Some lesions are locally destructive because of size and location.

Slide 40 · Intracranial cavernous hemangiomas

A cerebral vascular lesion can compress adjacent tissue.

Rupture is another potential source of symptoms.

Anatomical location therefore influences clinical severity independently of benign histology.

Vascular lesion in brain

Compression or rupture

Neurologic symptoms

Slide 41 · Cavernous hemangioma and von Hippel–Lindau

Cavernous hemangiomas are described as a component of von Hippel–Lindau disease.

Vascular lesions may occur in cerebellum, brain stem, retina, pancreas and liver.

Syndromic context should be considered with appropriately distributed lesions.

Sites highlighted

Cerebellum / brain stem

Retina

Pancreas / liver

Slide 42 · Capillary versus cavernous morphology

The key distinction is vascular channel caliber and architecture.

Capillary lesions have closely spaced thin-walled channels and scant stroma.

Cavernous lesions feature large spaces with connective tissue septa.

Capillary

Small thin-walled capillaries

Scant supporting stroma

Often superficial

Cavernous

Large dilated vascular spaces

Intervening connective tissue

Frequently deeper / infiltrative

Slide 43 · Hemangioma versus angiosarcoma: Caution

Benign hemangioma usually forms recognizable blood-filled channels.

Malignant endothelial tumors may be solid, atypical and poorly vascularized architecturally.

Radiologically detected cavernous lesions can be difficult to distinguish from malignant counterparts.

Usually benign

Organized endothelial-lined spaces

Bland endothelial lining

Clinical context often reassuring

Concerning malignant pattern

Disorganized solid growth

Cellular atypia

Tissue evaluation may be required

Slide 44 · Pyogenic granuloma: Clinical appearance

A rapidly growing, red, often pedunculated vascular mass.

Typical locations: Skin, gingiva and oral mucosa.

This as a capillary hemangioma variant.

Surface capillary lesion — schematic

Red pedunculated capillary-rich mass

Original schematic — not a histologic or clinical image

Slide 45 · Pyogenic granuloma: Temporal clues

Approximately one-quarter arise after trauma description.

The lesion may reach 1–2 cm over only a few weeks.

Rapid enlargement alone does not establish malignancy.

Possible preceding trauma

Rapid lesion growth

1–2 cm over weeks

Slide 46 · Why pyogenic granulomas bleed

The lesion is richly vascular and often ulcerated.

It may bleed easily after minor irritation.

Vascularity and surface ulceration jointly account for the clinical appearance.

Capillary-rich lesion

Surface ulceration

Bleeding tendency

Slide 47 · Pyogenic granuloma: Local treatment

Curettage followed by cautery is usually curative.

Treatment addresses a localized vascular proliferation.

Site and bleeding tendency are relevant to clinical management.

Slide 48 · Pregnancy tumor: A gingival variant

Granuloma gravidarum is a pyogenic granuloma involving gingiva during pregnancy.

Occurrence in approximately 1% of pregnant patients.

It shares the rapidly growing vascular nature of pyogenic granuloma.

Recognition

Pregnancy

Gingival mass

Capillary-rich / bleeding lesion

Slide 49 · Pregnancy tumor: Possible outcomes

Some lesions regress spontaneously, particularly after pregnancy.

Others undergo fibrosis.

Occasional lesions require surgical excision.

Gingival pregnancy lesion

Regression or fibrosis

Excision if needed

Slide 50 · Case: Rapidly growing gingival lesion

Hypothetical teaching case

A patient develops a friable red gingival mass that bleeds with minor contact during pregnancy.

Question: Which hemangioma variant fits the site and setting?

Reasoning: The pregnancy association is specific; Malignancy cannot be inferred from rapid growth alone.

Discussion prompt: Identify the lesion and the decisive clues.

Slide 51 · Hemangioma variants: Integrate the clues

Variant

Hallmark

Clinical course / issue

Capillary

Small thin-walled channels

Common in skin / mucosa

Juvenile

Newborn skin; strawberry-type

Rapid growth then regression

Cavernous

Large dilated channels

Deeper; no spontaneous regression

Pyogenic granuloma

Red pedunculated mass

Rapid onset; bleeding / ulceration

Slide 52 · Lymphangioma: The lymphatic counterpart

Lymphangiomas are benign lesions of lymphatic vessels.

They have endothelium-lined spaces, as blood-vessel tumors do.

Luminal contents and lymphatic endothelial markers help distinguish the systems.

Vessel content distinguishes lineages

Blood

Lymph

Original schematic — not a histologic or clinical image

Slide 53 · Simple lymphangioma: Clinical pattern

Usually slightly elevated or pedunculated.

May reach approximately 1–2 cm.

Predominantly affects head, neck and axillary subcutaneous tissues.

This is the small-channel counterpart of cavernous lymphangioma.

Slide 54 · Simple lymphangioma: Tissue pattern

Interconnected endothelium-lined lymphatic spaces form the lesion.

Unlike blood-filled capillary lesions, spaces may lack red cells.

The architecture must be interpreted alongside the site and markers.

Endothelial-lined lymphatic channels

Original schematic — not a histologic or clinical image

Slide 55 · Blood vessels versus lymphatic spaces

Blood-containing vascular channels often contain visible erythrocytes.

Lymphatic channels may be relatively empty of erythrocytes.

The absence of red cells is supportive, not the only diagnostic criterion described.

Blood-vessel lesion

Channels contain erythrocytes

Hemangioma variants

Vascular architecture

Lymphatic lesion

Lymphatic spaces may lack red cells

Lymphangioma variants

Lymphatic endothelial phenotype

Slide 56 · Lymphatic lineage: Marker support

VEGFR-3 and LYVE-1 as lymphatic endothelial markers.

These markers can help distinguish lymphangioma from capillary channels.

Marker interpretation should accompany morphology rather than substitute for it.

Support lymphatic identity

VEGFR-3

LYVE-1

Interpret with channel morphology

Original schematic — not a histologic or clinical image

Slide 57 · Cavernous lymphangioma: Characteristic sites

Also known as cystic hygroma.

Usually encountered in neck or axilla in children.

Less often affects retroperitoneum.

Typical distribution

Pediatric neck

Axilla

Occasional retroperitoneum

Slide 58 · Cystic hygroma: Potentially large lesion

Cavernous lymphangiomas may become enormous (up to 15 cm).

Large lesions may fill the axilla or distort the neck.

Dimensions and infiltrative boundaries help explain the clinical presentation.

Expanded cervical lymphatic spaces

Multiple enlarged lymph spaces

Original schematic — not a histologic or clinical image

Slide 59 · Cavernous lymphangioma: Histology

Massively dilated lymphatic spaces are endothelial-lined.

Connective tissue stroma separates the spaces.

Lymphoid aggregates are present within intervening stroma.

Massively dilated lymphatic spaces

Original schematic — not a histologic or clinical image

Slide 60 · Unencapsulated margins complicate surgery

Cavernous lymphangiomas have indistinct, unencapsulated margins.

They blend with adjacent tissue rather than shelling out as a discrete capsule.

This helps explain why complete resection may be difficult.

Indistinct margins

Integration with adjacent tissue

Difficult resection

Slide 61 · Cystic hygroma and Turner syndrome

Cervical cavernous lymphangiomas as common in Turner syndrome.

The association is relevant when a child has a large neck lesion.

Association is a clue, not a substitute for examining an individual lesion.

Slide 62 · Simple versus cavernous lymphangioma

Both represent lymphatic endothelial-lined spaces.

Size, location, lumen dilation and tissue boundaries differ.

The cavernous variant is especially notable for large size and poorly defined margins.

Simple lymphangioma

Slightly raised; Often 1–2 cm

Subcutaneous head/neck/axilla

Smaller lymphatic channels

Cavernous lymphangioma

May become very large

Neck, axilla; Sometimes retroperitoneum

Massively dilated lymphatic spaces

Slide 63 · Case: A large vascular neck mass in childhood

Hypothetical teaching case

A child has a large nonencapsulated multilocular-appearing neck lesion; Tissue shows lymphatic spaces with lymphoid aggregates.

Question: Which lesion best accounts for the morphology?

Reasoning: Lymphatic contents, deep size and margins matter more than the generic word “vascular.”

Discussion prompt: Identify the lesion and the decisive clues.

Slide 64 · Vascular tumor-like lesions: Final comparison

Lesion

Structural substrate

Key recognition clue

Telangiectasia

Dilated preexisting small vessels

Surface lesion; specific distribution

Capillary hemangioma

Small blood-filled capillaries

Thin walls; scant stroma

Cavernous hemangioma

Large blood-filled spaces

Deep, persistent; thrombosis possible

Lymphangioma

Lymphatic endothelium-lined spaces

Absent RBCs / lymphatic markers

Slide 65 · An initial diagnostic reasoning pathway

First determine whether the lesion is a dilation, a vascular proliferation or a lymphatic proliferation.

Then use architecture, blood content, depth, age and clinical course.

Escalate concern when atypia or poor vascular organization challenges a benign diagnosis.

Clinical setting + architecture

Ectasia | hemangioma | lymphangioma

Assess specific variant / concern

Slide 66 · Three high-yield distinctions

A persistent port-wine stain is not the same clinical course as a regressing nevus flammeus.

A juvenile hemangioma commonly involutes; A cavernous hemangioma does not.

A large poorly circumscribed cervical lymphatic lesion points toward cystic hygroma.

Morphology → consequence

Dilated vessel → visible ectasia

Blood-filled tumor → hemangioma

Lymphatic spaces → lymphangioma

Slide 67 · Further reading

Robbins, Cotran & Kumar: Pathologic Basis of Disease.

Review the section on vascular tumors, including vascular ectasias, hemangiomas and lymphangiomas.

Use authentic microscopy and gross pathology images alongside these conceptual schematics when teaching diagnostic morphology.