Onychoscopy
Pronunciation: on-ih-KOS-koh-pee
The dermoscopic examination of the nail unit, including the nail plate, bed, and folds, to aid diagnosis of nail disorders. Not synonymous with dermoscopy applied to skin lesions.
Full Definition
Onychoscopy refers to the use of a dermatoscope to examine the nail apparatus, encompassing the nail plate, nail bed, lunula, hyponychium, and surrounding folds. It is employed to differentiate nail pigmentation causes—such as melanonychia striata, subungual haematoma, or fungal infection—and to assess inflammatory nail disease including psoriatic nail changes. The technique reduces the need for nail biopsy in many diagnostic scenarios. Editors must ensure 'onychoscopy' is used specifically for nail examination and not as a synonym for dermoscopy in general.
Usage
Usage note: Restrict use to nail unit examination; do not use interchangeably with dermoscopy.
In Context
- "Onychoscopy demonstrated a homogeneous brown band consistent with benign ethnic melanonychia." — Nail disorders case report
- "The dermatologist used onychoscopy to exclude subungual melanoma before recommending conservative management." — Outpatient consultation letter