Extramammary Paget's disease pathophysiology
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]Associate Editor(s)-in-Chief: Simrat Sarai, M.D. [2]
Overview
Pathophysiology
Gross Pathology
On gross pathology, the following are characteristic findings of extramammary Paget's disease:
- Plaque with an irregular border
- Erythematous or white
Microscopic Pathology
- Paget's cells are large cells with abundant amphophilic or basophilic, finely granular cytoplasm, which tend to stand out in contrast to the surrounding epithelial cells.
- The nucleus is usually large, centrally situated, and sometimes contains a prominent nucleolus. Prominent nuclear atypia and pleomorphism are present.
- Signet ring cells may be present in small numbers and mitotic figures are more frequent.
- The Paget's cells may be dispersed singly or form clusters, solid nests, or glandular structures. The majority of cells are concentrated in the lower strata, but there may be infiltration into upper strata of the epidermis, often being observed in the pilosebaceous apparatus.
- Cells may be present in sweat gland ducts, leading to confusion as to whether the lesion has spread from a local apocrine neoplasm or has arisen within the epidermis. A dense inflammatory infiltrate is often seen associated with the epidermal malignancy.
- In approximately more than 90% of cases of extramammary Paget's disease the tumor cells contain cytoplasmic mucin, stain positively with periodic acid Schiff (PAS) and mucicarmine reagent. Only 40% of cases of mammary Paget's disease show any intracellular mucin and staining is generally weaker than in extramammary Paget's disease.
- Cytological examination of skin scrapings from lesions of Paget's disease reveals eccentric nuclei and single malignant cells with vacuolated cytoplasm, three dimensional cell aggregates, and acinar groups consistent with glandular differentiation. However, the material obtained is variably cellular and often shows a background of keratinous debris, which may lead to confusion with squamous neoplasia or inflammatory skin conditions or squamous neoplasia. Hence, it may be more appropriate to biopsy lesions.[1]
Pathogenesis
References
- ↑ Lloyd, J (2000). "Mammary and extramammary Paget's disease". Journal of Clinical Pathology. 53 (10): 742–749. doi:10.1136/jcp.53.10.742. ISSN 0021-9746.