Pathology
Images
Atlas of dermatopathology
Josef Feit, Hana Jedličková, Günter Burg, Luděk Matyska, Spasoje Radovanovic et al.
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+ Introduction
+ Literature
+ Support
+ Skin biopsy
+ Non-tumorous skin diseases
+ Skin tumors
+ Cysts of the skin and subcutis
+ Soft tissue lesions
+ Some lesions of the oral cavity
+ Dermatovenerology
+ Collection of histological slides by prof. Günter Burg
+ Collection of histological slides by prof. Werner Kempf
+ Collection of histological slides of dr. Ram Chandra Adhikari
Epidermal (infundibular) cyst
Clinical signs
  • probably the most common cyst
  • size usually several milimeters
  • contents: keratin

Epidermal cyst (2814)

Etiology
  • etiology unknown
  • dilatation of hair follicle
  • sometimes on the basis of epithelial inclusions (traumatic)
Pictures

Epidermal cyst, face: Atheroma, Clinical picture (659)

Multiple epidermal cysts and comedones of the back (atheromatosis): Atheroma, Clinical picture (661)

Atheroma, ear lobe: Atheroma, ear, Clinical picture (2814)

Histology

Cyst with epidermal lining with granular layer, no adnexa, filled with keratin. Does not contain hairs. Sometimes with rupture and inflammation, often granulomatous or purulent.

Epidermal cyst (1955)

Epidermal cyst (1956)

Pictures

Epidermal cyst: Epidermal (infundibular) cyst, HE 10x (1955) Epidermal (infundibular) cyst, HE 40x (1956)

Epidermal cyst, inflammation: Epidermal cyst, inflammation, HE 20x (211) Epidermal cyst, inflammation, HE 40x (212)

Epidermal cyst: Epidermal cyst, HE 40x (12356)

Epidermal cyst: Cyst, epidermal (infundibular), HE 40x (12660)

Epidermal cyst: Epidermoid cyst, HE 40x (10818)

Epidermal cyst with foreign body reaction: Epidermal cyst, ruptured, with foreign body reaction, HE 20x (12357)

Epidermal cyst, regression, giant cells, Russel's bodies: Epidermal cyst with inflammation and regression, HE 40x (12661) Epidermal cyst, regressive, inflammed, HE 40x (12985)

Ruptured epidermal/infundibular cyst: Cyst, epidermal (infundibular), ruptured, HE 20x (5459)

Epidermal (infundibular) cyst with granulomatous reaction to keratin; above the cyst there is palisading granuloma (granuloma annulare): Epidermal cyst and granuloma annulare, HE 40x (6067)

Epidermal cyst, inflammation, vasculitis: Epidermal cyst, inflammation, vasculitis, HE 20x (14185) Epidermal cyst, inflammation, vasculitis, HE 20x (14186)

Atheroma contents: Atheroma contents, HE 40x (10606)

Epidermal cyst with squamous cell carcinoma: Squamous cell carcinoma within an infundibular cyst, HE 40x (4836)

Epidermal cyst with squamous cell carcinoma: Squamous cell carcinoma, infundibular cyst, HE 20x (13994)

Calcifying epidermal cysts of the vagina: Calcificating cysts of the vagina, HE 40x (6205)

Tiny follicular cyst with variable lining: Hybrid epidermal cyst, HE 20x (13711) Hybrid epidermal cyst, HE 20x (13712)

Tiny epidermal cyst with Darier-like dyskeratosis (accidental finding): Epidermal cyst, Darier-like changes, HE 60x (13930)