title: Bullous pilomatricoma: a report of clinical and pathologic findings and review of dermal bullous disorders.
abstract: BACKGROUND
  Pilomatricoma is a common benign adnexal tumor differentiating toward elements of the hair matrix and shaft. It typically presents as a solitary, deep, dermal nodule. We describe a case of a pilomatricoma with the unusual feature of a thick-walled dermal bulla overlying the tumor.
  
  
  OBJECTIVE
  We describe a case of bullous pilomatricoma and discuss the potential etiology of the bullous feature of the lesion.
  
  
  METHODS
  This article includes a case report and a literature review.
  
  
  CONCLUSIONS
  Bullous pilomatricoma has rarely been described. A common pathological feature in this type of pilomatricoma is the presence of dilated lymphatics. Bullous morphea associated with dermal lymphatic dilation has also been described. In both bullous pilomatricoma and morphea, it is possible that individual pathological features of the lesion lead to obstruction and congestion of the dermal lymphatics thereby inducing enough dilation and edema to form a dermal bulla.
authors.affiliation: Division of Dermatology, University of British Columbia, St. Paul's Hospital, 1081 Burrard Street, Vancouver, British Columbia, Canada V6Z 1Y6.
authors.forename: G E
authors.initials: GE
authors.lastname: Weichert
authors.forename: K L
authors.initials: KL
authors.lastname: Bush
authors.forename: R I
authors.initials: RI
authors.lastname: Crawford
mesh_terms: D000328:Adult; D005260:Female; D006201:Hair Diseases / Q000473:pathology*; D006801:Humans; D018296:Pilomatrixoma / Q000473:pathology*; D011247:Pregnancy; D011252:Pregnancy Complications, Neoplastic / Q000473:pathology*; D012878:Skin Neoplasms / Q000473:pathology*