Hyperparakeratosis
Pronunciation: hy-per-pa-ra-ker-ah-TOH-sis
A histopathological term denoting an abnormally thickened parakeratinised surface layer in which nuclei are retained within the keratin, seen in oral mucosal biopsies.
Full Definition
Parakeratosis is a physiological finding in areas of the oral mucosa that do not normally orthokeratinise (e.g., buccal mucosa, floor of mouth), but hyperparakeratosis implies an excessive thickening of this layer. In oral pathology, hyperparakeratosis is commonly documented alongside acanthosis and is a frequent reactive change. Editors must distinguish 'hyperparakeratosis' (retained nuclei in thickened surface layer) from 'hyperorthokeratosis' (thickened anucleate keratin), as the two terms carry different clinical and prognostic implications when associated with dysplasia. Both are correctly written as single unhyphenated words.
Usage
Usage note: Write as one unhyphenated word: 'hyperparakeratosis'. Editors should confirm that the pathologist's report specifies parakeratosis or orthokeratosis, as these are not interchangeable.
In Context
- "Microscopy revealed hyperparakeratosis and mild chronic inflammation in the submucosa, consistent with frictional keratosis." — Histopathology report
- "The reviewer noted that 'hyperparakeratosis' and 'hyperorthokeratosis' had been used synonymously, which the authors corrected in revision." — Peer review response