Libyan Dermatoscope

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شهادات اليوم العلمي الثاني الإلكترونية متوفرة الآن 🥰

Seborrheic Keratosis: Histology Meets Dermoscopy — Part 4

Clonal Type
One of the less common and more challenging variants of seborrheic keratosis.

🧫 Histology: ✔ Intraepidermal nests of basaloid cells
✔ Borst-Jadassohn phenomenon

🔬 Dermoscopy: ✔ Blue-gray globules
✔ Brown clods
✔ Structureless pigmented areas

🔍 Clinical: Can mimic Melanoma or Basal Cell Carcinoma in some cases.

Key correlation:
Basaloid nests histologically = globular/clod-like dermoscopic structures

Coming next: Irritated type

Seborrheic Keratosis: Histology Meets Dermoscopy — Part 3

Reticulated (Adenoid) Type
Unlike the classic verrucous subtype, this variant tends to appear flatter and may mimic Solar Lentigo clinically.

🧫 Histology: ✔ Thin branching strands of basaloid keratinocytes
✔ Reticulated architecture

🔬 Dermoscopy: ✔ Fingerprint-like structures
✔ Fine brown lines
✔ Delicate reticular pattern

🔍 Clinical: Usually presents as a flat or slightly raised pigmented lesion.

Key correlation:
Reticulated epidermal strands histologically = fingerprint pattern dermoscopically
Coming next: Clonal type

Seborrheic Keratosis: Histology Meets Dermoscopy — Part 2

Hyperkeratotic type
This subtype is characterized histologically by:
✔ Marked hyperkeratosis
✔ Papillomatosis
✔ “Church-spire” projections
🔍 Clinical clues:

Verrucous surface
Thick keratotic plaque
Classic “stuck-on” appearance

🔬 Dermoscopy:
Fissures and ridges
Cerebriform pattern
Fat fingers
Comedo-like openings

Key correlation:
Papillomatosis histologically = cerebriform pattern dermoscopically

Stay tuned for Part 3: Reticulated (Adenoid) type