Difference between revisions of "Dermal cysts"

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(→‎Pilar cyst: +steatocytsoma)
Line 71: Line 71:
*#*Similar appearance to compact keratin (hyperkeratosis).
*#*Similar appearance to compact keratin (hyperkeratosis).
*#'''No''' granular cell layer.
*#'''No''' granular cell layer.
Images:
*[http://www.flickr.com/photos/santoshpath/4788590105/in/photostream/ Steatocystoma - low mag. (flickr.com)].
*[http://www.flickr.com/photos/santoshpath/4788590109/ Steatocystoma - high mag. (flickr.com)].


==See also==
==See also==

Revision as of 04:14, 11 September 2011

Dermal cysts are common in dermatopathology. Dermatopathologists can diagnose 'em.

Cysts

Common types:[1]

Epidermal necrosis

Venous lake

  • Dilated vein.

Microscopic

Features:[2]

  • Lined by endothelium.
  • Blood in lumen.
  • +/-Fibrin in lumen.

DDx:

  • Angiokeratoma.
    • Ectatic superficial dermal vessels.
    • Irregular acanthosis.
    • Longer rete ridges.

Epidermal inclusion cyst

  • AKA epidermal cyst.

General

  • Very common.

Microscopic

Features:

  • Cyst lining has a granular layer - key feature.[3]
  • Trapped collagen bundles at edge of lesion with surrounded by fibroblasts.
  • Keratin.

Image:

DDx:

Pilar cyst

  • AKA trichilemmal cyst.

General

  • Very common.

Microscopic

Features:

  • Keratin.
  • Cyst lining has no granular layer - key feature.
  • Trapped collagen bundles at edge of lesion with surrounded by fibroblasts.

DDx:

Steatocystoma

General

  • Benign.
  • Typically adults.
  • Usually on the trunk.

Microscopic

Features:[4]

  • Cyst lined by squamous epithelium with:
    1. Corrugated eosinophilic lining - key feature.
      • Similar appearance to compact keratin (hyperkeratosis).
    2. No granular cell layer.

Images:

See also

References

  1. TN07 D5
  2. Weedon's Skin Pathology. 3rd Ed. P.895.
  3. URL: http://emedicine.medscape.com/article/1058907-diagnosis. Accessed on: 18 March 2011.
  4. Busam, Klaus J. (2009). Dermatopathology: A Volume in the Foundations in Diagnostic Pathology Series (1st ed.). Saunders. pp. 312. ISBN 978-0443066542.