Pilar sheath acanthoma
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| Pilar sheath acanthoma | |
|---|---|
| Diagnosis in short | |
 Pilar sheath acanthoma. H&E stain. | |
| LM DDx | trichofolliculoma, dilated pore of Winer, epidermal inclusion cyst |
| Gross | raised lesion, central cavitation |
| Site | skin - classically upper lip |
|
| |
| Clinical history | typically middle aged - 50s |
| Prevalence | rare |
| Prognosis | benign |
Pilar sheath acanthoma is a rare benign skin lesion.
General
- Rare.[1]
- Considered a hamartoma.[1]
- Does not regress like keratoacanthoma.
- Typically middle aged individuals - median age in one series 55 years old, range 46-75 years old.[2]
Gross
- Raised lesion with a central depression - somewhat similar to keratoacanthoma.
- Classcially upper lip.[2]
DDx:
Microscopic
Features:[2]
- Cystic cavity with:
- Keratineous material.
- Usually extends from surface to deep cutis - like a hair shaft.
- Lining consists of a thickened squamous epithelium.
DDx:
Images
PSA. (WC)
www: