- Introduction to dermatoscopy
- Dermoscopic features
- Three-point checklist
- Dermoscopy of benign melanocytic lesions
- Dermoscopy of atypical naevi
- Dermoscopy of malignant melanoma
- Dermatoscopy of seborrhoeic keratosis
- Dermoscopy of basal cell carcinoma
- Dermatoscopy of squamous cell carcinoma
- Dermatoscopy of other non-melanocytic lesions
- First step algorithm
- Pattern analysis
- Other algorithms for melanocytic lesions
- The dermatoscopy report
- Melanocytic naevi: new classification
- Dermoscopy of the nail
- Dermatoscopic-histologic correlation
- Naevi with special features images
- Site-specific naevus images
- Unclassifiable naevus images
Developed in collaboration with the University of Auckland Goodfellow Unit in 2007.
Author: Hon A/Prof Amanda Oakley, Dermatologist, Hamilton, New Zealand, 2008.혻혻
Images have been sourced from the following:
- Hon Assoc Prof Amanda Oakley
- The Department of Dermatology, Waikato Hospital
- MoleMap New Zealand (with permission)
- Dr Richard Williamson and coworkers (as indicated in dermatoscopic-histology page*)
Three-point checklistNext Previous
- Describe and use the 3-point checklist for evaluating pigmented skin lesions by dermoscopy
The dermoscopy 3-point checklist for early detection of skin cancer is fairly easy to learn and has a high sensitivity for melanoma. (1) There a high likelihood of malignancy (melanoma or basal cell carcinoma) if a pigmented skin lesion has any two of these criteria. The 3-point checklist has been designed to allow non-experts not to miss detection of melanomas. However, it is not as specific as pattern analysis (described in a later section).
- Asymmetry: asymmetry of colour and structure in one or two perpendicular axes
- Atypical network: pigment network with irregular holes and thick lines
- Blue-white structures: any type of blue and/or white colour, i.e. combination of blue-white veil and regression structures
The main aim of the 3-point checklist is to determine whether the lesion being examined should undergo a biopsy. It does not an require accurate diagnosis to be made as the finer features of the lesion are not examined.
The following lesions demonstrate approximate symmetry of colour and structure. Shape is not considered.
The lesions below demonstrate asymmetry of colour or structure in one or two axes. Not all asymmetrical lesions are malignant.
The following lesions are considered to have typical pigment network.
The lesions below have atypical pigment network, with irregular holes and thick lines (broadened network). Streaming or pseudopods would also be considered atypical. Not all lesions with atypical network prove to be malignant.
Irregular pigment network: black arrows to broadened network, asterisk to streaming
Blue-white structures can refer to any type of blue and/or white colour, i.e. combination of blue-white veil and regression structures, as shown in the following pictures. The colour can be subtle. Not all lesions with blue-white structures are malignant.
Practice dermoscopy, evaluating skin lesions using the 3-point checklist.