PMD
Also written as: PMD — Potentially Malignant Disorder
Abbreviation for Potentially Malignant Disorder; used in oral medicine to denote a group of conditions carrying a recognised risk of transformation to oral squamous cell carcinoma.
Full Definition
PMD is the WHO-endorsed abbreviation replacing the older acronym OPL (oral potentially malignant lesion) and the now-discouraged term 'precancerous lesion'. The PMD category encompasses entities such as oral leukoplakia, erythroplakia, oral submucous fibrosis, oral lichen planus, and proliferative verrucous leukoplakia, among others. Editors must ensure the abbreviation is expanded at first use and that individual documents do not conflate PMD with 'premalignant' (a term some authorities consider premature given uncertain transformation rates). The concept is foundational to oral cancer prevention frameworks.
Usage
Usage note: Expand at first use. The term 'precancerous' should generally be avoided in favour of 'potentially malignant' in contemporary oral medicine writing.
In Context
- "All patients diagnosed with a PMD were enrolled in a six-monthly recall programme." — Clinical protocol document
- "The abbreviation PMD should be written out in full at first mention: 'potentially malignant disorder (PMD)'." — Journal style guideline