|Description||Describes dermoscopyThe examination of [skin lesions] with a 'dermatoscope'. This traditionally consists of a magnifier (typically x10), a non-polarised light source, a transparent plate and a liquid medium between the instrument and the skin, and allows inspection of skin lesions unobstructed by skin surface reflections. Modern dermatoscopes dispense with the use of liquid medium and instead use polarised light to cancel out skin surface reflections. of polymorphous vesselsmultiple types of vessels are present may indicate malignancy in appropriate context for example in flat melanocytic lesions|
|Author(s)||Ralph P. Braun|
|Responsible author||Ralph Braun → send e-mail|
|Status update||June 29, 2019|
|Status by||Ralph P. Braun|
Differential diagnosisis the identification of the nature and cause of a certain phenomenon. Diagnosis is used in many different disciplines with variations in the use of logic, analytics, and experience to determine "cause and effect". In systems engineering and computer science, it is typically used to determine the causes of symptoms, mitigations, and solutions
The presence of polymorphous vessels may suggest a diagnosis of melanomaThis glossary term has not yet been described.. The most common combinationThis glossary term has not yet been described. of vessel types seen in melanoma is the presence of both dotted vesselstiny pinpoint vessels and linear–irregular vesselsThis glossary term has not yet been described.. In a study of lesions with vascular features seen on dermoscopy, only 20% of the lesions contained polymorphous structuresThis glossary term has not yet been described., which correlated with a PPV of 52.6% for melanoma. More specifically, the combination of dotted and linear–irregular vessels was found in 18% of amelanotic/hypomelanotic melanomas but only extremely rarely in other nonmelanoma amelanotic/hypomelanotic lesions (1.8% of AHNML and 0% of AHBML). Polymorphous vessels in combinations other than dotted vessels and linear–irregular vessels may be observed in cutaneous melanoma metastases. They can also be seen in papillomatous melanocyticThis glossary term has not yet been described. neviThis glossary term has not yet been described. and other tumors, such as eccrine poromas.
ReferencesThis is material contained in a footnote or bibliography holding further information.:
- Marghoob & Braun: Proposal for a revised 2-step algorithm for the classification of lesions of the skin using dermoscopy. Arch Dermatol 2010;146:426-8. PMID: 20404234. DOI.
- Braun et al.: Dermoscopy: what's new?. Clin. Dermatol. 2009;27:26-34. PMID: 19095151. DOI.
- Argenziano et al.: Vascular structures in skin tumors: a dermoscopy study. Arch Dermatol 2004;140:1485-9. PMID: 15611426. DOI.
- Pizzichetta et al.: Amelanotic/hypomelanotic melanoma: clinical and dermoscopic features. Br. J. Dermatol. 2004;150:1117-24. PMID: 15214897. DOI.
- Minagawa et al.: Dermoscopic and histopathological findings of polymorphous vessels in amelanotic cutaneous metastasis of pigmented cutaneous melanoma. Br. J. Dermatol. 2009;160:1134-6. PMID: 19302066. DOI.
- Niederkorn et al.: Frequency, clinical and dermoscopic features of benign papillomatous melanocytic naevi (Unna type). Br. J. Dermatol. 2009;161:510-4. PMID: 19466956. DOI.
- Ferrari et al.: Eccrine poroma: a clinical-dermoscopic study of seven cases. Acta Derm. Venereol. 2009;89:160-4. PMID: 19326001. DOI.