The histopathology of psoriasis

Area of Science:

• Dermatology
• Rheumatology
• Pathology

Background:

• Psoriasis is a prevalent, chronic, relapsing papulo-squamous dermatitis.
• Characterized by silvery scales, it commonly affects the scalp, sacral region, and extremities.
• Inverse psoriasis involves flexural areas, while nail and oral lesions are frequent.

Purpose of the Study:

• To describe the clinical and histological characteristics of psoriasis.
• To highlight common and less common manifestations of the disease.
• To differentiate psoriasis from other eczematous dermatitides.

Main Methods:

• Review of clinical presentations and histological findings in psoriasis.
• Classification of psoriatic lesions into early, advanced, and later stages.
• Identification of diagnostic histological clues such as Munro microabscesses and Kogoj micropustules.

Main Results:

• Psoriasis frequently involves the scalp, extensor surfaces, nails, and oral mucosa.
• A significant percentage (5-8%) of patients develop psoriatic arthritis, primarily affecting interphalangeal joints.
• Histological examination reveals dynamic changes, with diagnostic features like Munro microabscesses and Kogoj micropustules often present in early or advancing lesions.

Conclusions:

• Psoriasis is a complex dermatosis with diverse clinical and histological manifestations.
• Accurate diagnosis relies on recognizing characteristic skin lesions, potential joint involvement, and specific histological findings.
• While diagnostic clues exist, distinguishing psoriasis from other eczematous conditions requires careful evaluation.