BSD Self Assessment Workshop - virtualpathology.leeds.ac.uk
Transcript of BSD Self Assessment Workshop - virtualpathology.leeds.ac.uk
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Case 28 RAC5258
BSD Self Assessment Workshop 7th July 2013
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F57. Persistent eczematous eruption with vesicles exterior limbs. ?Acute eczema. ?Drug eruption. DD: ?Prebullous pemphigoid.
RAC5258
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occassional eosinphils
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Case 28: Summary
• Spongiotic: Acute vesicular
• Perivascular lymphocytes
• Occasional eosinophils
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Clues: Vase Shape
A vase-like shape characterizes the epidermal-mononuclear cell collections seen in spongiotic dermatitis. LeBoit PE, Epstein BA.
Am J Dermatopathol. 1990 Dec; 12(6):612-6.
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Summary Histology
• Vase like collections of mononuclear cells with associated spongiosis
• Moderately dense superficial perivascular lymphocytic infiltrate
• Occasional eosinophils
Diagnosis: Clinicopathological correlation Favours spongiotic drug reaction
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Drug Eruptions: General 1 • Diverse clinical & histological • Vary from single patch or plaque to erythroderma • Virtually every histological pattern
– Perivascular dermatitis – Nodular and diffuse dermatitis – Vasculitis – Vesicular dermatitis (intra- and sub-epidermal) – Pustular dermatitis – Peri-infundibulitis and perifolliculitis – Fibrosing dermatitis – Panniculitis
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Drug Eruptions: General 2 • Occasionally characteristic clinically &
histologically – Fixed drug eruption
• May closely simulate authentic dermatoses – Lichen planus – Pityriasis rosea – Measles
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Clues to Drug Reaction
CLINICAL • Widespread, bilateral, symmetrical distribution • Do not correspond to any well-defined disease HISTOLOGICAL • Do not correspond to any well-defined disease • Eosinophils are often present • Eosinophils may be abent: e.g. erythema
multiforme • MIXED PATTERNS CONSIDER
– Drugs – Syphilis – Mycosis Fungoides
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Differential for BSD Workshop
• Drug reaction • Pityriasis rosea • Allergic contact dermatitis • Pityriasis lichenoides • Mycosis fungoides
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• More generalised eruption follows over 7 to 14 days
• Pink scaly lesion ~ 1cm • Blaschko line
distribution (fir tree) • Progresses in
distribution over 2 – 3 weeks, lesions persist for 2 – 3 weeks, then fade over 2 – 4 weeks
• Variants: Papular, vesicular, bullous, urticarial, haemorrhagic
Pityriasis Rosea
Clinical Image removed from Presentation
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Pityriasis Rosea
• 10 to 35 years • Aetiology: probably
infection/viral • Acute onset oval
papulosquamous lesions
• Herald patch usually (48 hrs)
Clinical Image removed from Presentation
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Pityriasis Rosea: Histology • Non-specific subacute dermatitis • Focal hyperkeratosis • Angulated (lens shaped) parakeratosis
(absent granular layer) • Mild spongiosis (vesicles rare) • Slight acanthosis • Intraepidermal cytoid bodies (50%) • Lymphohistiocytic superficial perivascular
infitlrate • Extravasated RBC common • +/- Scattered eosinophils
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RAC3272
F42. ??lupus, ?psoriasis, ?pityriasis rosea, ?reticulate atrophic pigmentation
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RAC3272
c/w Pityriasis Rosea
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Pityriasis Rosea: Differentials
• Eczematous Group: Acute/Subacute • Guttate psoriasis (neutrophils in stratum
corneum) • Drug reactions (long list) • Erythema annulare centrifugum
(indistinguishable histologically)
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‘Types’ of parakeratosis - Weedon • Mound-like
– Pityriasis rosea, erythema annulare centrifugum • Confluent, thick zones
– Psoriasis, pityriasis lichenoides, glucagonoma, deficiency states, granular parakeratosis
• With neutrophils – Psoriasis, dermatophyte, secondary bacterial infection
• Overlying orthokeratosis – Healing lesion or intermittent activity
• Alternating with orthokeratosis – ILVEN; horizontal plane only – PRP; horizontal and vertical
• Perifollicular lipping – Seborrhoeic dermatitis, PRP (follicular lesions), facial spongiotic processes
or facial psoriasis • Cornoid lamella
– Porokeratosis
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Differential for BSD Workshop
• Drug reaction • Pityriasis rosea • Allergic contact dermatitis • Pityriasis lichenoides • Mycosis fungoides
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Contact Dermatitis
• Allergic (eosinophils) – Cell mediated
hypersensitivity reaction
– Metals, synthetic rubber, plants/vegetation, topical medicines
– Patch testing
• Irritant (neutrophils) – More common – Physical/chemical
damage – Acute: potent irritant
e.g. Acid/alkali – Chroinic: cummulative
effect of mild irritant e.g. soap
Suggested by history, distribution & enquiry occupational exposure
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Differential for BSD Workshop
• Drug reaction • Pityriasis rosea • Allergic contact dermatitis • Pityriasis lichenoides • Mycosis fungoides
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Pityriasis Lichenoides
• Uncommon • ?hypersensitivity reaction to infections
– Adenovirus, toxoplasmosis, EBV, Mycoplasma pneumoniae, HIV
– Parvovirus B19 DNA (30%) • Tomasini et al J Cutan Pathol 2004
• Acute ulceronecrotic form: – Pityriasis lichenoides et varioliformis acuta
(PLEVA) aka Mucha Haberman Disease • Chronic scaly papular form
– Pityriasis lichenoides chronica (PLC)
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Pityriasis Lichenoides
• M:F ratio 3:1 • Late childhood to young adults • Arms, Legs, Trunk & Buttocks • Asymptomatic or mild itching/burning • Onsent usually insidious and episodic “crops” of lesions
• Duration variable from months to years • Seasonal variation (worse in winter)
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Pityriasis lichenoides: Acute Lesions
• Crops of pink papules • May form vesicles or be haemorrhagic • Ulcerate with necrosis • Heal with superficial “varioliform” scars • Depigmentation common • Lesions are polymorphic (different stages)
– Cf guttate psoriasis & lichen planus • May have pyrexia and lymphadenopathy • Rare febrile ulceronecrotic variant (with systemic
manifestations)
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PLEVA Histology • Marked inter- and intra-cellular oedema • Keratinocyte necrosis • Interface changes • Vesiculation/ulcerations • Prominent exocytosis of lymphocytes • Red cell extravasation (intra-epidermal) • Oedematous upper dermis with chronic inflammatory cell
infiltrate sparse to dense, typically “wedge-shaped” (established lesions)
• Dilated and congested superficial vessels • Rarely fibrinoid necrosis in vessels
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Pityriasis Lichenoides: Chronic Lesions
• Numerous, lichenoid, brown/red scaly papules
• 3 to 10mm • Scale accentuated peripherally “mica” • Usually heal without scarring • May be associated with depigmentation
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PLC Histology
• Parakeratosis sometimes with collections of lymphocytes
• Slight acanthosis • Occasional necrotic keratinocytes • Interface lymphocytic infiltrate • +/- Spongiosis • Perivascular lymphocytic infiltrate • +/- RBC extravasation
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RAC3641
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RAC3641
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RAC3641
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Definitions: Spongiotic
• Intercellular oedema (epidermis &/or epithelial structures of adnexa)
• Separation of spinous cells
• Intercellular bridges conspicous
• Sprinkling of inflammatory cells – Usually lymphocytes – +/- Eosinophils – +/- Neutrophils
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Spongiotic: Superficial Perivascular Lymphocytes with Eosinophils
• Allergic contact / Discoid eczema / Pompholyx / Id Reaction
• Arthropod • Drug reactions
• Pruritic urticarial papules and plaques of pregancy (PUPPP)
• Bullous pemphigoid / Pemphigoid gestationis
• Pemphigus vulgaris (urticarial)
• Incontintia pigmenti • Toxic erythema of the
newborn
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General (Algorithmic) Approach
Dr A. Bernard Akerman c/o Richard Perry/The New York Times
6
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Ackerman: Algorithmic Approach
• Identify one of the (nine) patterns • Refer to the algorithm for that pattern • Follow the branches of the algorithm to
a specific diagnosis • Read up the features of the diagnosis
and correlate with clinical and histological details of the case.
• If the diagnostic criteria are not fulfilled go back to the algorithm and start again
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Drug reaction
Drug reaction
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Eczematous (Spongiotic) Dermatitis
• Clinical group characterised by – Pruritic vesicles, – Rupture forming crusts – Erythematous base – Become “lichenified”
in chronic cases
Clinical Image removed from Presentation
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Eczema “aetiological” Groups ENDOGENOUS • Atopic dermatitis • Seborrhoeic dermatitis • Discoid (nummular)
dermatitis • Hand eczema
(dishidrotic, pompholyx) • Autosensitization (Id)
reaction
EXOGENOUS • Allergic contact • Irritant contact • Infective (S. aureas) • Asteatotic eczema
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Eczematous (Spongiotic) Dermatitis: Histological Subclassification
• Acute – Vesiculation and bullae
• Subacute – Acanthosis, spongiosis and vesicles
common • Chronic
– Spongiosis (subtle), vesicles uncommon – Psoriasiform epidermal acanthosis
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Spongiosis Vesicle (Acute)
• Accumulation of fluid within the epidermis leads to a vesicle
RAC3123
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Subacute/Chronic Spongiotic Psoriasiform (Lichenified “eczematous”)
RAC3254
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Spongiotic Dermatitis: Late • Chronic rubbing and scratching leads to scaly
and thickened lesions – Lichenification dominates – Psoriasiform pattern with minimal spongiosis
Clinical Image removed from Presentation
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Other Conditions with Spongiosis
• Pityriasis rosea • Erythema annulare
centrifugum • Superficial fungal
infection (dermatophytosis)
• Bullous pemphigoid/Herpes gestationis (early)
• Pruritic urticarial papules and plaques of pregnancy
• Erthema multiforme • Miliaria rubra • Guttate parapsoriasis • Acral papular eruption of
childhood • Lichen striatus • Insect-bite reaction • Prurigo nodularis • Grover’s Disease • Mycosis fungoides • Psoriasis
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When to Do PAS • Clinical suspicion • Spongiotic • Psoriasiform • Mucocutaneous (including lichenoid) • Neutrophils in cornified layer • Invisible dermatosis (tinea) • Pustulating granulomas • ?Lupus, dermatomyositis, Lichen Sclerosus
– Basemement membrane
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Learning Points: Report Style • Consise description
– Pattern and cells – Specific features top to bottom
• Special stains – List and results
• Offer suggestions in order of probability • Suggest clinicopathological correlation • Clinical investigations or follow-up often clinch
the final diagnosis
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Differential for BSD Workshop
• Drug reaction • Pityriasis rosea • Allergic contact dermatitis • Pityriasis lichenoides • Mycosis fungoides
– See presentation for Case 26
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LeBoit PE, Epstein BA. A vase-like shape characterizes the epidermal-mononuclear cell collections seen in spongiotic dermatitis. Am J Dermatopathol. 1990 Dec; 12(6):612-6.
Thank You
References