Two-step algorithm

From dermoscopedia

(1 vote)

 Authored by: Ralph P. Braun     ·  Ashfaq A. Marghoob

 Keywords:   algorithm · nonmelanocytic · melanocytic · two-step algorithm · melanoma · dermoscopy
Description This chapter provides a detailed description of the Two-step algorithmThis glossary term has not yet been described. in dermoscopyDermoscopy is a non invasive diagnostic method.. This is a very useful approach for the 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 of pigmented lesion.
Author(s) Ralph P. Braun · Ashfaq A. Marghoob
Owner Ralph Braun→ send e-mail
Status released
Status update January 16, 2018
Status by Ralph P. Braun

Classic two-step algorithm

Revised two-step algorithm

Wedistinguish two different types of diagnostic algorithms: the classic two step algorithmIn mathematics and computer science, an algorithm (Listeni/ˈælɡərɪðəm/ AL-gə-ri-dhəm) is a self-contained sequence of actions to be performed. Algorithms can perform calculation, data processing and automated reasoning tasks. and the revised two step algorithm. In 2001, the Board of the Consensus Net Meeting agreed on a two-step algorithmThis glossary term has not yet been described. for the classificationis a general process related to categorization, the process in which ideas and objects are recognized, differentiated, and understood. of pigmented lesions of the skin [1]. In the first level of decision making, the observer must decide whether a lesion is of melanocyticThis glossary term has not yet been described. or nonmelanocyticThis glossary term has not yet been described. origin. Once the lesion is identified to be of melanocytic origin, one can move on to level two. This second step the decision must be made if a melanocytic lesion is benignis any condition that is harmless in the long run, suspect, or malignantThis glossary term has not yet been described..

We recently came up with a further development of the two step algorithm which is a logical ceonsequence of the 2 step approach.
  1. Argenziano et al.: Dermoscopy of pigmented skin lesions: results of a consensus meeting via the Internet. J. Am. Acad. Dermatol. 2003;48:679-93. PMID: 12734496. DOI.