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Journal of the American Academy of Dermatology
Volume 71, n° 1
page 38 (juillet 2014)
Doi : 10.1016/j.jaad.2014.02.042
accepted : 27 February 2014
Original Articles

Pilomatrix carcinoma: 13 new cases and review of the literature with emphasis on predictors of metastasis
 

Jennifer L. Herrmann, MD a, , Adam Allan, DO b, Kara M. Trapp, BA c, Michael B. Morgan, MD d, e
a Department of Dermatology, University of Alabama at Birmingham, Birmingham, Alabama 
b Lake Erie College of Osteopathic Medicine, Bradenton, Florida 
c Georgetown University School of Medicine, Washington, District of Columbia 
d Dermatology, Michigan State University College of Osteopathic Medicine, East Lansing, Michigan 
e Pathology, University of South Florida Morsani College of Medicine, Tampa, Florida; and Dermpath Diagnostics in Tampa, Pensacola, and Marietta, Georgia 

Reprint requests: Jennifer L. Herrmann, MD, University of Alabama at Birmingham, 1530 Third Ave S, EFH 414, Birmingham, AL 35294.
Abstract
Background

Pilomatrix carcinoma is a rare cutaneous tumor derived from follicular matrix cells with few cases documented in the literature.

Objective

We sought to better characterize this tumor by analyzing its epidemiologic, clinical, and histopathologic features in 13 new cases and by reviewing the literature.

Methods

All cases of pilomatrix carcinoma from a large regional dermatopathology practice were identified and analyzed by chart review for clinical and histopathologic characteristics. Similar characteristics were compiled from an additional 123 cases in the English-language literature. Cox proportional hazards regression models were used to determine risk factors associated with the development of metastasis for all identified metastatic tumors.

Results

Our 13 tumors were most common in middle-aged to older white men and presented mostly on the head/neck. Histopathologically, tumors were asymmetric, were poorly circumscribed, were composed of basaloid and “ghost” cells, had frequent atypical mitoses, and had infrequent lymphovascular invasion. Wide excision was considered the most definitive treatment modality, but local recurrence was common. When analyzing all reported cases of metastasis using statistics, metastasis was significantly associated (hazard ratio 3.45, P < .0413) with local tumor recurrence.

Limitations

The retrospective, single-center design and the reliance on electronic medical records are limitations.

Conclusions

This study helps better characterize pilomatrix carcinoma and identifies potential predictors of metastasis.

The full text of this article is available in PDF format.

Key words : calcifying epitheliocarcinoma of Malherbe, malignant pilomatricoma, matrical carcinoma, metastatic pilomatricoma, pilomatrical carcinoma, pilomatrix carcinoma



 Funding sources: None.
 Conflicts of interest: None declared.
 Please visit www.jaad.org to access the reference list for this article.



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