Browsing by Author "Norris, Frances"

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    Nuevas técnicas diagnósticas para el Demodex en la rosácea y la demodicosis New diagnostic techniques for Demodex in rosacea and demodicosis
    (2021) Pérez, Jaime; García, Viviana; Norris, Frances; Velásquez, Daniel
    El Demodex es un ectoparásito humano que se encuentra como parte de la flora comensal de la piel en o cerca de las unidades pilosebáceas, comúnmente en las mejillas, la nariz, el mentón, la frente, las sienes, los ojos, las cejas, las pestañas, el cuello y las orejas. Las especies que se aíslan con mayor frecuencia son el Demodex folliculorum y el Demodex brevis. La infestación es común con una prevalencia entre el 23y el 100% en los adultos sanos4.Generalmente cursa de forma asintomática, por lo que su papel patogénico se manifiestacuando se encuentra en altas densidades, más de 5 ácaros por cm2 o cuando penetra en la dermis. A esta condición se le denomina demodicosis o demodicidosis.
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    Ulcerated Keloid Secondary to a Coexisting Complicated Epidermal Inclusion Cyst: A Sonographic Diagnosis
    (2020) Pérez, Jaime; Whittle, Carolina; García, Viviana; Norris, Frances; Castro, Alex; Hitschfeld, Mario
    Keloid is a benign fibroblastic tumor that is most often secondary to tissue injury. The clinical presentation is a hard red or purple tumor, mostly itchy or painful. The clinical objectives are to report an ulcerated keloid secondary to a central or inner complicated epidermal inclusion cyst histologically proven and to describe the sonographic findings that permitted the diagnosis. A 29-year-old man with multiple large keloids on the chest wall presented with a two-day pain history, increased volume, and ulceration on one side. Physical examination showed a keloid with edema, peripheral erythema, and a 1-cm central ulcer with purulent discharge. On the sonogram, multiple solid dermal hypodermal pseudotumors were visualized. The lesions were well-defined hypoechogenic heterogeneous solid masses that were hypovascular with color Doppler, concordant with keloids. Within the ulcerated enlarged mass, a complicated epidermal inclusion cyst was discovered with inflammatory changes. The significance of this case lies in the very low frequency of ulceration of a keloid and the high diagnostic value of sonography to demonstrate the presence of a coexisting epidermal inclusion cyst. In the differential diagnosis of an ulcerated keloid, sonography can assist in achieving a better presurgical approach

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