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Cutaneous pseudosarcomatous polyp: a histological and immunohistochemical study
B T Williams1, R J Barr, T L Barrett
1Department of Dermatology and Pathology, University of California, Irvine, USA.
Journal of Cutaneous Pathology
|April 1, 1996
Summary
Two elderly women developed benign skin lesions with concerning cell atypia. Histology revealed bizarre cells and mitoses, but these features were deemed reactive, not cancerous.
Area of Science:
- Dermatopathology
- Histology
- Oncology
Background:
- Investigating unusual acquired skin lesions presenting with significant histological atypia.
- Understanding the clinical and histological spectrum of benign skin neoplasms.
Observation:
- Two elderly female patients presented with long-standing, acquired polypoid skin lesions on the back and thigh.
- Clinically, the lesions resembled fibroepithelial polyps or nevus lipomatosus.
- Histological examination revealed prominent atypia, including bizarre pleomorphic spindle/stellate cells, multinucleation, atypical mitoses, hyalinized vessels, and myxoid stroma.
Findings:
- Despite marked histological atypia and occasional atypical mitoses, both lesions were biologically benign.
- Immunohistochemistry showed positivity solely for vimentin.
- The observed features suggest a reactive or degenerative process, sharing similarities with degenerating angiofibroma and vaginal pseudosarcomatous polyp.
Implications:
- Highlights the importance of distinguishing reactive atypia from malignancy in dermatopathology.
- Suggests that certain benign skin lesions can exhibit significant cytological abnormalities without neoplastic potential.
- Emphasizes the need for careful clinicopathological correlation in diagnosing unusual skin lesions.