Differential Diagnosis of Telangiectasias

Introduction

Telangiectasias are permanently dilated small blood vessels (venules, capillaries, or arterioles) that are visible on the skin or mucous membranes as fine, red, linear, or branching lesions. They blanch with pressure (diascopy) but refill immediately upon release. While often a cosmetic concern related to sun damage or aging, telangiectasias can also be markers of significant systemic disease, including hereditary hemorrhagic telangiectasia, scleroderma, and liver failure.

The clinical significance of telangiectasias depends on their morphology, distribution, and associated clinical features. This chapter provides a systematic approach to differentiation.

---

23.1 Morphological Classification

Understanding the morphology helps narrow the differential.

23.1.1 Linear Telangiectasias

• Appearance: Simple, straight or curved single vessels.
• Examples: Facial telangiectasias from photo-aging, post-rosacea.

23.1.2 Arborizing (Branching/Dendritic) Telangiectasias

• Appearance: Tree-like branching pattern from a central feeding vessel.
• Clinical Significance: Classic for rosacea. Also a key dermoscopic feature of Basal Cell Carcinoma (arborizing vessels over pearly papule).

23.1.3 Spider Telangiectasias (Spider Angiomas / Spider Nevi)

• Appearance: Central red arteriole with radiating leg-like vessels. Central point pulsates and blanches when compressed.
• Clinical Significance: Estrogen-related. Common in:
  • Pregnancy
  • Chronic Liver Disease (cirrhosis → hyperestrogenism)
  • Oral contraceptive use
• Distribution: Face, upper trunk, upper limbs (above the nipple line).
• Test: Compress the central arteriole → legs blanch. Release → legs refill from center.

23.1.4 Punctate (Papular/Dot-like) Telangiectasias

• Appearance: Small, red dots or papules.
• Clinical Significance:
  • Hereditary Hemorrhagic Telangiectasia (HHT): Mucocutaneous telangiectasias (lips, tongue, nasal mucosa, fingertips).
  • CREST Syndrome: Mat-like or punctate telangiectasias on face, hands, lips.

23.1.5 Mat-like (Carpet-like) Telangiectasias

• Appearance: Confluent, sheet-like telangiectatic areas.
• Clinical Significance: Characteristic of Scleroderma (CREST).
• Distribution: Face (malar), lips, hands, oral mucosa.

---

23.2 Primary (Idiopathic) Telangiectasias

23.2.1 Essential (Generalized) Telangiectasia

• Definition: Progressive, widespread telangiectasias without identifiable systemic cause.
• Demographics: Typically middle-aged women.
• Distribution: Starts on legs, spreads upward over years.
• Prognosis: Benign. No systemic associations.

23.2.2 Unilateral Nevoid Telangiectasia (UNT)

• Definition: Segmental, unilateral telangiectasias appearing in a dermatomal distribution.
• Associations:
  • Congenital
  • Acquired: Pregnancy, Liver disease (estrogen effect), Puberty.
• Mechanism: Estrogen receptor hypersensitivity in affected segment.

---

23.3 Secondary (Acquired) Causes

23.3.1 Photo-aging (Dermatoheliosis)

• Mechanism: Chronic UV damage weakens vessel walls and degrades dermal collagen.
• Distribution: Sun-exposed areas: Face, V of chest, dorsal forearms/hands.
• Associated Features: Solar lentigines, wrinkles, leathery skin, actinic keratoses.

23.3.2 Rosacea

• Epidemiology: Fair-skinned individuals. Female predominance.
• Clinical Features:
  • Centrofacial erythema (cheeks, nose, chin, forehead).
  • Telangiectasias: Arborizing pattern.
  • Papulopustules (papulopustular subtype).
  • Phymatous changes (rhinophyma in advanced stages).
• Differential from Lupus: Rosacea spares nasolabial folds; LE involves them.

23.3.3 Topical Corticosteroid Atrophy

• Mechanism: Long-term topical steroid use causes dermal atrophy, thinning of skin, and vessel prominence.
• Features: Telangiectasias + Skin thinning + Striae at application site.
• Common Culprits: Potent fluorinated steroids (Clobetasol, Betamethasone) especially on face.

23.3.4 Radiation Dermatitis

• Timing: Develops months to years after radiation therapy.
• Distribution: Within radiation port.
• Features: Telangiectasias + Atrophy + Poikiloderma (mixed pigmentary changes) + Skin fragility.

23.3.5 Poikiloderma of Civatte

• Definition: Chronic photo-damage of lateral neck presenting as reticulated erythema, telangiectasias, hyperpigmentation, and atrophy.
• Key Feature: Submental sparing (shaded by chin).
• Demographics: Middle-aged women.
• Aggravating Factor: Photosensitizers in perfumes (Berloque dermatitis component).

---

23.4 Telangiectasias as Markers of Systemic Disease

[!IMPORTANT] Telangiectasias may be the presenting feature of serious systemic conditions.

23.4.1 Hereditary Hemorrhagic Telangiectasia (HHT / Osler-Weber-Rendu Syndrome)

• Inheritance: Autosomal Dominant. Genes: ENG (HHT1), ACVRL1/ALK1 (HHT2), SMAD4 (Juvenile Polyposis-HHT overlap).
• Pathophysiology: Abnormal vascular development → Telangiectasias (skin/mucosa) and Arteriovenous Malformations (AVMs in viscera).
• Diagnostic Criteria (Curaçao Criteria - 3 of 4 = Definite HHT):
  1. Spontaneous, recurrent epistaxis.
  2. Mucocutaneous telangiectasias: Lips, oral cavity, nasal mucosa, fingertips.
  3. Visceral AVMs: Pulmonary, Hepatic, Cerebral, Spinal.
  4. Family history: First-degree relative with HHT.
• Clinical Features:
  • Epistaxis: Often first symptom. Recurrent, can be severe leading to iron deficiency anemia.
  • Telangiectasias: Characteristic sites: Lips, tongue, nasal septum, fingertips, conjunctiva.
  • GI Bleeding: From GI telangiectasias. Presents as melena or iron deficiency anemia.
  • Pulmonary AVMs: Paradoxical emboli → Stroke, Brain abscess. Hypoxemia.
  • Hepatic AVMs: High-output cardiac failure, portal hypertension.
  • Cerebral AVMs: Hemorrhagic stroke.
• Screening: All patients with HHT should be screened for pulmonary and cerebral AVMs.

23.4.2 Scleroderma (Systemic Sclerosis) / CREST Syndrome

• CREST Acronym:
  • Calcinosis cutis
  • Raynaud's phenomenon
  • Esophageal dysmotility
  • Sclerodactyly
  • Telangiectasia
• Telangiectasia Pattern: Mat-like (confluent) telangiectasias on face (especially malar area), lips, hands (especially palms), oral mucosa.
• Nail Fold Capillary Changes: Dilated capillary loops (megacapillaries) with dropout areas—visible on dermoscopy/capillaroscopy. Important early diagnostic clue.
• Associated Antibodies: Anti-centromere (limited cutaneous SSc/CREST).

23.4.3 Chronic Liver Disease (Cirrhosis)

• Mechanism: Impaired hepatic metabolism of estrogens → Hyperestrogenic state.
• Telangiectasia Type: Spider Angiomas (stellate, with central pulsating arteriole).
• Distribution: Above the nipple line (face, upper chest, upper arms).
• Other Stigmata of Liver Disease: Palmar erythema, Gynecomastia, Testicular atrophy, Jaundice, Ascites.
• Significance: >5 spider angiomas in a patient should prompt evaluation for liver disease.

23.4.4 Ataxia-Telangiectasia (Louis-Bar Syndrome)

• Inheritance: Autosomal Recessive. ATM gene mutation.
• Telangiectasia: Conjunctival and facial telangiectasias appearing in early childhood (after age 2-3).
• Neurological: Progressive cerebellar ataxia (truncal ataxia, dysarthria, oculomotor apraxia).
• Immunodeficiency: Combined B and T cell deficiency → Recurrent sinopulmonary infections.
• Malignancy Risk: High risk of lymphoma and leukemia.
• Lab: Elevated AFP. Low IgA, IgE.

23.4.5 Dermatomyositis

• Nail Fold Changes: Periungual telangiectasias with ragged cuticles (Samitz sign).
• Capillaroscopy: Dilated, tortuous capillary loops with dropout.
• Associated Signs: Heliotrope rash, Gottron's papules, Shawl sign.

---

23.5 Telangiectasias and Cutaneous Malignancy

[!WARNING] Arborizing telangiectasias over a pearly papule = Basal Cell Carcinoma until proven otherwise.

• Basal Cell Carcinoma (BCC):
  • Classic dermoscopic feature: Arborizing (treelike) vessels over a pearly, translucent nodule.
  • Other dermoscopic features: Blue-gray ovoid nests, spoke-wheel structures, ulceration.
• Radiation-Induced Malignancy: Chronic radiodermatitis with telangiectasias is a risk factor for SCC and BCC within the radiation field.

---

23.6 Diagnostic Algorithm

Loading diagram...

---

23.7 Summary Comparison Table

---

23.8 Clinical Pearls

1. Spider angiomas above the nipple line + Other liver stigmata → Evaluate for chronic liver disease.
2. Mat-like telangiectasias on face/hands + Raynaud's + Sclerodactyly → Think CREST/Scleroderma. Check anti-centromere antibody.
3. Mucocutaneous telangiectasias (lips, tongue, fingertips) + Recurrent epistaxis → HHT. Screen for pulmonary and cerebral AVMs.
4. Conjunctival telangiectasias + Ataxia in child → Ataxia-Telangiectasia. Check AFP.
5. Arborizing vessels over a pearly papule → Basal Cell Carcinoma. Biopsy.
6. Telangiectasias on lateral neck with submental sparing → Poikiloderma of Civatte.
7. Nail fold capillaroscopy: Dilated loops with dropout → Think Scleroderma or Dermatomyositis.