Volume 18, Issue 6 pp. 708-710

Alopecia neoplastica due to metastatic breast carcinoma vs. extramammary Paget's disease: mimicry in epidermotropic carcinoma

N Haas

Corresponding Author

N Haas

Department of Dermatology and Allergy, Charité, Humboldt-University Berlin, and

*Corresponding author, Department of Dermatology and Allergy, Charité, Humboldt–University Berlin, Germany, tel.: 49 30 450 518 124; fax: 49 30 450 518 915; E-mail: [email protected]Search for more papers by this author
St Hauptmann

St Hauptmann

Institute of Pathology, Martin-Luther-University Halle-Wittenberg, Halle (Saale), Germany.

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First published: 05 August 2004
Citations: 17

ABSTRACT

Clinically similar skin diseases can exhibit phenotypic mimicry as demonstrated here for alopecia neoplastica. An 89-year-old female patient had been treated for scalp eczema for several years until biopsy revealed pagetoid carcinoma. Her clinical history showed a mastectomy 20 years ago. For that reason the differential diagnosis was extramammary Paget's disease or epidermotropic metastasis of the breast carcinoma. Immunohistochemistry revealed positivity of MUC1, indicating that the latter is the case.

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