Subungual
Pronunciation: sub-UNG-gwal
Anatomical modifier meaning 'beneath the nail plate', used to describe lesions, haematomas, infections, or melanomas located under a fingernail or toenail.
Full Definition
Subungual is a positional descriptor applied to pathological processes occurring beneath the nail plate, overlying the nail bed. Examples include subungual melanoma (a particularly dangerous form of acral melanoma), subungual haematoma (blood collection from trauma), and subungual hyperkeratosis (thickening of the nail bed epithelium seen in onychomycosis and psoriasis). In editorial work, 'subungual' should be hyphenated only when used in direct compound modification before a noun, though many dermatology style guides prefer it open. Editors must ensure it is not confused with 'periungual' (around the nail) or 'intraungual' (within the nail plate).
Usage
Usage note: Distinguish from 'periungual' (around the nail fold) and 'paronychial' (relating to paronychia/nail-fold infection). Do not hyphenate unless required by journal style.
In Context
- "A subungual melanoma was identified on the right great toenail, presenting as a longitudinal melanonychia with Hutchinson's sign." — Dermatology case report
- "The proofread caught 'periungual haematoma' and corrected it to 'subungual haematoma' based on the clinical image description." — Proofreading correction