Melanocytic lesions with peripheral globules: results of an observational prospective study in 154 high-risk melanoma patients under digital dermoscopy follow-up evaluated with reflectance confocal microscopy.

BACKGROUND: The management of melanocytic lesions with peripheral globules (MLPGs) is usually age-dependent and can be challenging in high-risk melanoma patients. OBJECTIVES: To evaluate clinical, dermoscopic and reflectance confocal microscopy (RCM) features of MLPG in patients under digital dermoscopic surveillance. To know whether dermoscopic or RCM findings correlate with histologic diagnosis and the accuracy of the dermoscopy-RCM compared with histopathology. METHODS: During 24 months, we prospectively enrolled MLPG in patients under digital dermoscopy follow-up. All were evaluated by dermoscopy and RCM and excised for histologic examination. RESULTS: We enrolled 154 patients, mean age 42.45 years (18.78-73.19). Three melanomas and 19 dysplastic naevi (DNs) were diagnosed. There were no significant differences in the age of the patients (P = 0.662). MLPGs with diameter of 6 mm or more and asymmetry in two axes were associated with melanoma (P = 0.01, P = 0.003). Patients with more than one MLPG were less likely to have melanoma. Blue-grey and red colours were more frequent in melanoma (P = 0.013 and P = 0.000). Different sizes and shapes of PG were associated with DN and melanoma (P = 0.000 and P = 0.001). In a new lesion, PG in <25% of the circumference was related to malignancy (P = 0.010). RCM signs of malignancy were related to melanoma: pagetoid cells (P = 0.000), non-edged papillae (P = 0.001), atypical junctional thickenings (P = 0.000) and atypical cells at the dermal-epidermal junction (P = 0.000). Dense irregular nests were associated to melanoma (P = 0.019). Dermoscopy and confocal evaluation were able to diagnose 100% of melanomas and 84.21% of DNs. The kappa coefficient between dermoscopy-RCM vs. histology was 0.76. CONCLUSIONS: We recommend to excise a MLPG when it presents asymmetry in two axes, 6 or more mm, new lesion with PG in less than the 25% of the circumference, irregular size and shape PGs and irregular dense nests on RCM, regardless of the patient's age.

Microscopia confocal de reflectancia: una herramienta útil para diagnosticar malignidad en lesiones melanocíticas que presenten el signo de la isla / Reflectance Confocal Microscopy: A Promising Tool to Identify Malignancy in Melanocytic Lesions Exhibiting a Dermoscopic Island

El signo de la isla se define como un área bien delimitada en una lesión melanocítica, con un patrón dermatoscópico diferente al resto de la lesión. Es predictor de melanoma sobre todo cuando el patrón dermatoscópico de la isla es atípico. Presentamos las características con microscopia confocal de reflectancia (MCR) en un melanoma sobre nevus, un nevus melanocítico y un melanoma in situ con signo de la isla. El melanoma sobre nevus y el melanoma in situ, presentaban atipia celular (células atípicas aisladas y formando nidos) y distorsión arquitectural por MCR. El nevus presentaba un signo de la isla con un patrón globular típico con nidos densos sin atipia por MCR. El signo de la isla se relaciona sobre todo con melanomas in situ y melanomas sobre nevus. El MCR ofrece una buena resolución celular hasta dermis reticular, siendo útil en el diagnóstico de los melanomas con signo de la isla

The dermoscopic island is described as a well-defined area in a melanocytic lesion, with a different dermoscopic pattern from the rest of the lesion. It is predictive of melanoma, particularly when the pattern of the island is atypical. We present the reflectance confocal microscopy (RCM) findings in 3 lesions with dermoscopic islands: nevus-associated melanoma, melanocytic nevus, and in situ melanoma. The nevus-associated melanoma and in situ melanoma presented cellular atypia (atypical cells in isolation or forming nests) and architectural distortion on RCM. The nevus presented a dermoscopic island with a typical globular pattern with dense nests and no atypia on RCM. Dermoscopic island is mainly associated with in situ and nevus-associated melanomas. RCM offers good cellular resolution to the depth of the reticular dermis and is useful for diagnosing of melanomas presenting a dermoscopic island

Reflectance Confocal Microscopy: A Promising Tool to Identify Malignancy in Melanocytic Lesions Exhibiting a Dermoscopic Island. / Microscopia confocal de reflectancia: una herramienta útil para diagnosticar malignidad en lesiones melanocíticas que presenten el signo de la isla.

The dermoscopic island is described as a well-defined area in a melanocytic lesion, with a different dermoscopic pattern from the rest of the lesion. It is predictive of melanoma, particularly when the pattern of the island is atypical. We present the reflectance confocal microscopy (RCM) findings in 3 lesions with dermoscopic islands: nevus-associated melanoma, melanocytic nevus, and in situ melanoma. The nevus-associated melanoma and in situ melanoma presented cellular atypia (atypical cells in isolation or forming nests) and architectural distortion on RCM. The nevus presented a dermoscopic island with a typical globular pattern with dense nests and no atypia on RCM. Dermoscopic island is mainly associated with in situ and nevus-associated melanomas. RCM offers good cellular resolution to the depth of the reticular dermis and is useful for diagnosing of melanomas presenting a dermoscopic island.

Nevus esclerosante con rasgos seudomelanomatosos / Sclerosing nevus with pseudomelanomatous features: a case report

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Tumores de colisión valorados por microscopía confocal / Evaluation of Collision Tumors by Confocal Microscopy

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Pustular generalized perforating granuloma annulare.

We report a 84-year-old man with a 13-year history of recurrent generalized asymptomatic pustular lesions. Histology revealed areas of necrobiosis surrounded by palisading granulomas and transepidermal and follicular elimination of the necrobiotic material. A dense infiltrate of neutrophils was also found. Although 26% of patients with generalized perforating granuloma annulare have some yellow pustule-like papules, these correspond histologically to the yellow viscous necrobiotic material extruding through the epidermis and not to a real neutrophilic infiltrate. This is the first case report of perforating granuloma annulare with recurrent generalized pustular lesions with a dense infiltrate of neutrophils.

Fiebre y lesiones cutáneas en pierna en una niña de 20 meses de edad / Fever and cutaneous lesions in leg in a 20 month-old girl

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[Acromelanosis]. / Acromelanosis.

Acromelanosis is an independent disease entity, characterized by increased skin pigmentation, usually located on the acral areas of the fingers and toes. It is mostly seen in newborns or during the first years of life. Only a few cases of this entity have previously been described in the medical literature. In some of these cases, the cutaneous lesions spread to affect large parts of the skin surface. A possible association with other benign and malignant diseases has been proposed. Differential diagnosis must be made with a wide variety of systemic and dermatologic conditions, especially dermatoses with acral distribution of macular hyperpigmentation, including acropigmentation. In this article, we report a new case of acromelanosis in a 5-week-old girl showing two peculiar clinical features: associated melanosis of the genital mucosa and stabilization of the lesions after an initial phase of progression and proximal spread. In addition, the most important features of this rare cutaneous disease are discussed.

Acromelanosis / Acromelanosis

La acromelanosis es una enfermedad con entidad propia, caracterizada por un incremento de la pigmentación cutánea de distribución predominantemente acral, que se observa sobre todo en recién nacidos o durante los primeros años de vida. Se han descrito un número muy reducido de casos en la literatura médica, alguno de los cuales ha mostrado una importante extensión de las lesiones hasta afectar a numerosas localizaciones de la superficie corporal y se ha propuesto su asociación a otras enfermedades tanto benignas como malignas. El diagnóstico diferencial debe establecerse con otros procesos caracterizados por la presencia de máculas hiperpigmentadas en los dedos de las manos, entre los que destaca por su similitud clínica la denominada acropigmentación. En este artículo se presenta un nuevo caso de acromelanosis, en una niña de 5 semanas de edad, que además muestra características clínicas particulares, como la asociación a melanosis de mucosa genital y la estabilización posterior de las lesiones tras un período inicial de progresión y extensión de las mismas en sentido proximal. Así mismo, se discuten las características más relevantes de esta rara enfermedad cutánea, aunque fácil de identificar (AU)