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Vol. 102. Issue 5.
Pages 344-353 (June - July 2011)
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Vol. 102. Issue 5.
Pages 344-353 (June - July 2011)
Original Article
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Descriptive Dermoscopic Study of Depigmentation in Melanocytic Nevi Without a Visible Halo
Estudio descriptivo dermatoscópico de los nevos melanocíticos con despigmentación sin halo clínico
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J.M. Martína,
Corresponding author
Martin.josemaria@gmail.com

Corresponding author.
, J. Núñeza, V. Lópeza, M. Rubioa, C. Monteagudoa,b, E. Jordáa
a Servicio de Dermatología, Hospital Clínico Universitario, Valencia, Spain
b Servicio de Anatomía Patológica, Hospital Clínico Universitario, Universidad de Valencia, Valencia, Spain
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Abstract
Background and objectives

There are few cases described in the literature in which depigmentation of melanocytic nevi occurs without the appearance of halos. The aim of this study was to analyze the correlation between clinical and dermoscopic findings and to assess the usefulness of dermoscopy to identify possible markers of complete regression in melanocytic lesions.

Materials and methods

A prospective, observational, descriptive study of 77 melanocytic lesions in 52 patients was undertaken over a 5-year period. Melanocytic lesions from patients who underwent periodic follow-up in the digital dermoscopy unit were analyzed if they had exhibited partial or total, permanent depigmentation without a clinically apparent halo.

Results

We observed substantial variation in the time taken for pigmentation to disappear and the morphological characteristics of the nevi during the depigmentation process. Female sex and dermoscopic evidence of melanophage activity or of a halo were all associated with more rapid involution of pigmented lesions. The only variable which displayed a statistically significant association with complete depigmentation of melanocytic nevi was the presence of vascular proliferation. Fibrosis was the only variable that displayed a statistically significant association with heterogeneous depigmentation of melanocytic nevi.

Conclusions

In this study, we have identified patterns of depigmentation in melanocytic lesions that differ from the classic halo nevus.

Keywords:
Depigmentation
Halo nevus
Melanocytic nevus
Regression
Introducción

La despigmentación de nevos melanocíticos sin halo perilesional se ha descrito de forma excepcional en la literatura.

Material y métodos

Estudio observacional, descriptivo y prospectivo de 77 lesiones melanocíticas correspondientes a 52 pacientes, llevado a cabo durante un período de 5 años. Se han analizado las lesiones melanocíticas de pacientes revisados periódicamente en la unidad de dermatoscopia digital que habían sufrido una despigmentación permanente, ya fuera total o parcial, pero sin presentar clínicamente un halo blanquecino alrededor de los mismos.

El objetivo fue estudiar la correlación entre los hallazgos clínicos y dermatoscópicos a estudio, y establecer el valor de la dermatoscopia para identificar posibles marcadores de regresión completa de lesiones melanocíticas.

Resultados

Hemos observado mecanismos de despigmentación sin halo muy dispares, tanto en lo referente al tiempo que tardaban las lesiones en perder la pigmentación, como en las características morfológicas de los nevos durante el proceso de involución. La presencia de melanofagia, halo dermatoscópico y el sexo femenino fueron las variables que demostraron una asociación estadísticamente significativa, con un menor tiempo de involución de las lesiones pigmentadas. La existencia de proliferación vascular fue la única variable que demostró una asociación estadísticamente significativa con la despigmentación completa de los nevos melanocíticos. La existencia de fibrosis fue la única variable que ha demostrado una asociación estadísticamente significativa con la despigmentación heterogénea de los nevos melanocíticos.

Conclusiones

El presente estudio ha permitido identificar la existencia de patrones de despigmentación de lesiones melanocíticas diferentes al halo nevo clásico.

Palabras clave:
Despigmentación
Halo nevus
Nevo melanocítico
Regresión
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Copyright © 2011. Academia Española de Dermatología y Venereología and Elsevier España, S.L.
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