Exceptions to rules & mimickers

From dermoscopedia

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 Editor: Ashfaq A. Marghoob

 Author(s): Ayelet Rishpon     ·  Ashfaq A. Marghoob
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Description The two-step 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. 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. aims to differentiate between melanocyticThis glossary term has not yet been described. and non-melanocytic lesions and to determine if a melanocytic lesion is benignis any condition that is harmless in the long run or malignantThis glossary term has not yet been described.. While algorithms serve as guidelines that apply to the majority of cases, one should remember that every rule has exceptions. The recognition of the exceptions is essential for the maintenance of high diagnostic precision.
Author(s) Ayelet Rishpon · Ashfaq A. Marghoob
Responsible author Ash Marghoob→ send e-mail
Status open
Status update March 5, 2018
Status by Ralph P. Braun


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Feature 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 Mimickers
Negative NetworkThis glossary term has not yet been described. MelanomaThis glossary term has not yet been described. Ridges of Seborrheic keratosesThis glossary term has not yet been described.
Spitz/Reeds Globular StructuresThis glossary term has not yet been described. of dermatofibromas
Severe Dysplastic neviThis glossary term has not yet been described.
CMN
Streakslines radial (always at periphery) streaks Reed nevus melanoma recurrent nevus Melanoma Leaf-like areasBrown to gray/blue discrete linear or bulbous structures coalescing at a common off center base creating structures that resemble a leaf-like pattern. of BCCAbbreviation for Basal Cell Carcinoma
Spitz/Reeds nevusThis glossary term has not yet been described. Ridges (fat-fingers) of seborrheic keratosesThis glossary term has not yet been described.
Pigmented periphery of Bowenalso known as squamous cell carcinoma in situ[1] is a neoplastic skin disease. It can be considered as an early stage or intraepidermal form of squamous cell carcinoma. It was named after John T. Bowen's disease
Pigmented periphery of cutaneous mets
Network NeviThis glossary term has not yet been described. Fingerprintinglines brown curved parallel thin of solar lentiginesThis glossary term has not yet been described.
Melanoma Cerebriform pattern of seborrheic keratoses
Solar lentigoThis glossary term has not yet been described.
Ink spot lentigo
DermatofibromaDermatofibromas are hard solitary slow-growing papules (rounded bumps) that may appear in a variety of colours, usually brownish to tan; they are often elevated or pedunculated. A dermatofibroma is associated with the dimple sign; by applying lateral pressure, there is a central depression of the dermatofibroma.
Accessory nipple
MastocytosisThis glossary term has not yet been described.
GlobulesThis glossary term has not yet been described. NevusThis glossary term has not yet been described. Lacuna
Melanoma Ovoid nests
Clonal Seborrheic keratosisThis glossary term has not yet been described. Blue-gray ovoid nestsclods blue large clustered
Cutaneous metastasis Pigmented cysts
Comedo-like openings[[Comedo like openings]]
PepperingGray dots/granularityThis glossary term has not yet been described. Melanoma Blue-gray dots of BCC
Lichen planusThis glossary term has not yet been described.-like keratosis Linear brown dots of pigmented Bowen’s disease
Pigmented actinic keratosisActinic keratosis (also called solar keratosis and senile keratosis; abbreviated as AK) is a pre-cancerous patch of thick, scaly, or crusty skin.
Nevi (focal and limited)
VesselsThis glossary term has not yet been described. Various melanocytic and non-melanocytic lesions Small ulcerations as in superficialThis glossary term has not yet been described. BCC
Linear brown/red dots of pigmented Bowen’s disease
Red globules of BCC
Background vesselsThis glossary term has not yet been described. in normal skin and sun-damaged skinThis glossary term has not yet been described.
BlotchDark structureless areas Melanoma Subcorneal hemorrhage
Clark's neviThis glossary term has not yet been described. Thrombosed angiomaAngiomas are benign tumors derived from cells of the vascular or lymphatic vessel walls (endothelium) or derived from cells of the tissues surrounding these vessels.[1][2] Angiomas are a frequent occurrence as patients age, but they might be an indicator of systemic problems such as liver disease. They are not commonly associated with malignancy.
Blue nevusis a type of melanocytic nevus that clinically and dermoscopically will appear blue Black lamella
Reed's nevi Exogeneous pigmentation
Heavily pigmented seborrheic keratoses
Heavily pigmented BCC
Venous angiomas
Shiny-white streakslines radial (always at periphery) streaks Reed nevus melanoma recurrent nevus Melanoma Negative networkSerpiginous interconnecting broadened hypopigmented lines that surround elongated and curvilinear globules.
Spitz nevusThis glossary term has not yet been described. White lines of scalp nevi
BCC Wickham striae
Dermatofibroma Rail lines (pyogenic granulomaThis glossary term has not yet been described.)
Scar
CirclesThis glossary term has not yet been described.-white Actinic keratoses Milia-like cystsThis glossary term has not yet been described.
SCCThis glossary term has not yet been described. Lobules of sebaceous hyperplasiaThis glossary term has not yet been described.
White clods of BCC
Lacunes of lymphangiomas
White globules of balloon cell nevi
Folliculitis
Molluscum
Circles-brown Dermatofibroma Curved lines of solar lentigines and seborrheic keraotoses
Bowen's disease Comedo-like openings
Facial melanomaThis glossary term has not yet been described.
Facial nevi
Facial solar lentigines
Angulated linesSyn: polygons, zig-zag pattern Gray-brown lines that are connected at an angle or coalescing to form polygons Melanoma of sun-damaged skin Spoke-wheel areas
Pigmented actinic keratosis Fingerprinting
Lichen planus-like keratosis Prominent networkThis glossary term has not yet been described. of congenital neviis a type of melanocytic nevus (or mole) found in infants at birth. This type of birthmark occurs in an estimated 1% of infants worldwide; it is located in the area of the head and neck 15% of the time. and Clark's nevi
Prominent lines of ink spot lentigo
Lattice like pattern of acralPertaining to peripheral body parts, especially hands, feet, fingers, and toes. nevi