Potentially Malignant Disorder
Also written as: PMD — Potentially Malignant Disorder
The WHO-preferred collective term for oral mucosal conditions that carry a demonstrably increased risk of transformation to squamous cell carcinoma, replacing the older designation 'premalignant lesion or condition.'
Full Definition
Potentially Malignant Disorder (PMD) is the current WHO classification term introduced to acknowledge that not all lesions within the group will necessarily undergo malignant transformation, while still indicating an elevated risk compared with normal mucosa. The term supersedes 'premalignant lesion,' 'precancer,' and 'premalignant condition' in formal oral pathology discourse. Conditions classified as PMDs include leukoplakia, erythroplakia, oral submucous fibrosis, actinic cheilitis, oral lichen planus (lichenoid lesions), and proliferative verrucous leukoplakia, among others. Editors must replace 'premalignant' with 'potentially malignant disorder' in manuscripts targeting WHO-aligned publications, and should flag uses of 'precancerous lesion' as potentially outdated. The key editorial distinction lies in the probabilistic ('potentially') rather than deterministic framing.
Usage
Usage note: Replace 'premalignant lesion' or 'precancerous lesion' with 'potentially malignant disorder' in WHO-aligned publications. Note 'OPMD' (oral potentially malignant disorder) is an acceptable expanded form. The term is plural-neutral—'disorder' applies to the category, not necessarily individual lesions.
In Context
- "The guidelines classified oral submucous fibrosis as a potentially malignant disorder (PMD) rather than a premalignant lesion." — Clinical Guidelines Document
- "The editor revised 'precancerous lesions' to 'potentially malignant disorders' throughout the review article to conform with current WHO terminology." — Review Article