Canis ISSN: 2398-2942

Skin: cutaneous cysts (subdivision follicular cysts)

Synonym(s): Epidermoid cyst, sebaceous cyst

Contributor(s): Kyle Braund, David Scarff

Introduction

  • Common, single or multiple lesions of hair follicle causing dermal swellings which may become inflamed.
  • Cause: trauma with genetic predisposition.
  • Signs: skin nodules.
  • Diagnosis: histopathology.
  • Treatment: surgical resection.
  • Prognosis: good in most cases.

Pathogenesis

Etiology

  • Probably the result of degenerative changes in hair follicles, cystic changes in ducts or cells of sebaceous glands, or traumatic displacement of epidermal fragments.

Predisposing factors

General
  • Chronic trauma.

Pathophysiology

  • Cystic dilatation of follicles with genetic predisposition.
  • Multiple and recurrent cysts on heads of young dogs (not dermoid cysts Skin: dermoid sinus in Rhodesian Ridgeback Rhodesian Ridgeback ) are a recognized entity.
  • Multiple cysts are also seen on pressure points and are probably secondary to chronic trauma.
  • There is no breed, sex or age predisposition for solitary cysts.
  • Lesions graded into benign follicular tumors such as trichoepithelioma and pilomatricoma.
  • If lesions traumatized then may rupture leading to foreign body reaction in dermis.

Timecourse

  • Weeks to months.

Diagnosis

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Treatment

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Outcomes

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Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • Scott D W & Anderson W I (1991) Cutaneous trichilemmal cysts in three dogs. Cornell Vet 81 (3), 245-249 PubMed.

Other sources of information

  • Nesbitt G H & Ackerman L J (1998)Canine and Feline Dermatology.Trenton, New Jersey: Veterinary Learning Systems. pp 310-311.


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