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Updated: Jul 14, 2026

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Published on: August 9, 2024
Incidental granular parakeratotic cornification in carcinomas.
Kenneth S Resnik1, Mario DiLeonardo
1Institute for Dermatopathology in Conshohocken, Conshohocken, Pennsylvania 19428, USA. kresnik@ameripath.com
Granular parakeratosis, characterized by specific cells in the skin, can be an incidental finding in various conditions. This study highlights its presence in carcinomas and introduces granular orthokeratotic cornification.
Area of Science:
- Dermatopathology
- Histopathology
- Oncology
Background:
- Granular parakeratosis is a histopathologic finding defined by parakeratotic corneocytes containing keratohyaline granules.
- It can be a diagnostic feature of specific dermatoses, a characteristic of solitary keratoses, or an incidental finding.
- Previous reports have documented granular parakeratosis incidentally in various dermatoses.
Purpose of the Study:
- To expand the understanding of granular parakeratosis as an incidental histopathologic feature.
- To report the occurrence of granular parakeratosis in carcinomas.
- To describe the phenomenon of granular orthokeratotic cornification.
Main Methods:
- Histopathologic examination of skin biopsy specimens.
- Analysis of cases demonstrating granular parakeratosis.
- Identification and characterization of granular orthokeratotic cornification.
Main Results:
- Granular parakeratosis was identified as an incidental histopathologic feature in carcinomas.
- The study presents cases expanding the known associations of granular parakeratosis.
- The phenomenon of retained keratohyaline granules within corneocytes without a nucleus (granular orthokeratotic cornification) was observed.
Conclusions:
- Granular parakeratosis can be an incidental histopathologic finding in carcinomas, broadening its diagnostic context.
- The observation of granular orthokeratotic cornification adds to the spectrum of keratinization abnormalities.
- Further research may elucidate the clinical significance and underlying mechanisms of these findings.
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