Carlos Misad
University of Chile
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Actas Dermo-Sifiliográficas | 2001
Francisco Zúñiga Urbina; Lilian Pérez; Emilio Sudy; Carlos Misad
Resumen —La calcificacion cutanea es un trastorno infrecuente caracterizado por el deposito de sales insolubles de calcio en la piel. Puede clasificarse en distrofica, metastasica e idiopatica. La calcificacion distrofica es el tipo mas comun y aparece en tejidos previamente danados, asociandose a una amplia variedad de trastornos inflamatorios neoplasicos, traumaticos o a enfermedades del tejido conectivo. La variedad metastasica aparece en pacientes con niveles plasmaticos elevados de calcio y/o fosforo. En la calcificacion idiopatica no existen evidencias de anomalias tisulares o de metabolismo fosfocalcico; son caracteristicos de este grupo el nodulo calcificado subepidermico, la calcificacion de los cartilagos auriculares, la calcificacion miliar asociada al sindrome de Down, la calcinosis tumoral y la calcificacion escrotal idiopatica. La osificacion cutanea puede ser primaria o secundaria. La primera es infrecuente y no existe lesion cutanea previa; incluye a la osteodistrofia hereditaria de Albright, la heteroplasia osea progresiva y distintas variedades de osteoma cutaneo: osteoma diseminado, osteoma en placa, osteoma solitario pequeno y osteoma miliar multiple de la cara. La osificacion secundaria aparece en lesiones preexistentes, comunmente asociada a cicatrices, tumores y diversos procesos inflamatorios.
Acta Oto-laryngologica | 2011
Mariela C. Torrente; Carolina Ríos; Carlos Misad; Roxana Ramírez; Mónica Acuña; Lucía Cifuentes
Abstract Conclusion: PCR-quality DNA could be extracted from formalin-fixed paraffin-embedded (FFPE) samples with amplicons of at least 390 bp. Paraffin removal was not a necessary step. Proteinase K digestion was as efficient as the commercial kit for DNA extraction with a lower cost. Objectives: To compare different DNA extraction protocols for FFPE samples and to describe the suitability of the extracted DNA for PCR reactions. Methods: For deparaffinization the following techniques were compared: alkaline heat, xylene, and no removal. For DNA extraction, proteinase K digestion and organic extraction were compared. A commercial extraction kit was included as standard. DNA quality was assessed by PCR amplification of the HFE gene, for amplicons of 208 and 390 bp. Results: Extraction with the commercial kit and proteinase K digestion were more efficient than other techniques, with no statistical difference between them for both amplicons. The proteinase K digestion buffer had a cost of U
Journal Der Deutschen Dermatologischen Gesellschaft | 2016
Francisco Urbina; Emilio Sudy; Carlos Misad
0.2 per sample and the commercial kit of U
Journal Der Deutschen Dermatologischen Gesellschaft | 2016
Francisco Zúñiga Urbina; Emilio Sudy; Carlos Misad
7 per sample.
Journal of The American Academy of Dermatology | 2002
Amparo Pérez; Arno Rütten; Reinhard Gold; Francisco Zúñiga Urbina; Carlos Misad; María José Izquierdo; Celia Requena; Adolfo Aliaga; Heinz Kutzner; Luis Requena
eine 75-jährige Frau stellte sich mit einer 5-jährigen Vorgeschichte asymptomatischer Läsionen vor, die auf ihre rechte Brust beschränkt waren und beim Tragen eines BHs Unannehmlichkeiten verursachten. Verletzungen oder Trauma an der betroffenen Stelle verneinte die Patientin. Die klinische Untersuchung ergab drei Plaques; jede von ihnen bestand aus mehreren gelblichen keratotischen anhaftenden Papeln. Die einzelnen Papeln hatten einen Durchmesser von 1 bis 2 mm und setzten sich aus 50 bis 60 einzelnen oder zusammenhängenden monomorphischen Elementen zusammen. Einige dieser Elemente waren erhabener als andere oder zeigten eine leichte Vertiefung in ihrem Zentrum (Abb. 1). Clinical Letter Eine Biopsie aus einer der Plaques ergab eine laminare orthokeratotische und hyperkeratotische Läsion, die in ihrem Zentrum stark eosinophil war und somit einen Kontrast zum normalen geflechtartigen Stratum corneum an beiden Seiten bildete. Die Epidermis unterhalb der Läsion zeigte einen Verlust der Reteleisten. An den Rändern der Läsion bildete die Epidermis papillomatöse Erhebungen ähnlich der Form einer Kirchturmspitze. In der Dermis gab es ein leichtes perivaskuläres lymphohistiozytisches entzündliches Infiltrat (Abb. 2). Topische Behandlungen, darunter Calcipotriol und Urea, blieben erfolglos. Die Läsionen wurden schließlich unter Verwendung von Elektrokauterisation und Kürettage entfernt. Es gab keine Rezidive. Hyperkeratosis lenticularis perstans (HPL), auch bekannt unter dem Eponym Flegel-Krankheit, ist eine seltene Verhornungsstörung, die erstmals 1958 von Flegel beschrieben wurde. Die meisten Fälle sind sporadischen Ursprungs, obwohl die Krankheit typischerweise als autosomal-dominante Erkrankung beschrieben wird. In einigen Serien war die Minderheit der Fälle familiär [1, 2]. Typischerweise befällt die Krankheit Männer mittleren oder fortgeschrittenen Alters, wobei bilaterale Läsionen hauptsächlich an den Fußrücken und den anterioren Seiten der Beine auftreten. Seltener wurde die Erkrankung an den oberen Extremitäten beschrieben sowie in Ausnahmefällen auch an anderen Lokalitäten. Klinisch zeichnet sie sich durch multiple rot-braune Papeln aus, die fast symmetrisch an den Rückseiten der Füße
Actas Dermo-Sifiliográficas | 2003
Emilio Sudy; Alice Cazal; Carlos Misad
A 75-year-old woman presented with a 5-year history of asymptomatic lesions confined to the right breast, which caused her discomfort when wearing a bra. The patient denied any injury or trauma to the affected area. Clinical inspection showed three plaques, each of them formed by several yellowish keratotic adherent papules. The individual papules measured 1 to 2 mm in diameter, and consisted of isolated or contiguous monomorphic elements, ranging from 50 to 60 per plaque. Some of these elements were more elevated than others or showed a slight depression at their center (Figure 1). A biopsy taken from one of the plaques revealed a laminar orthokeratotic and hyperkeratotic lesion, strongly eosinophilic at its center, thus representing a contrast to the normal basket-weave stratum corneum on both sides. The epidermis below the lesion showed a loss of the rete ridges. Towards the edges of the lesion, the epidermis formed papillomatous elevations similar to a church spire. In the dermis, there was a slight perivascular lymphohistiocytic inflammatory infiltrate (Figure 2). Topical treatments including calcipotriene and urea were unsuccessful. Eventually, the lesions were removed using electrocautery and curettage. There was no recurrence. Also known by its eponym (Flegel’s disease), hyperkeratosis lenticularis perstans (HLP) is a rare disorder of keratinization described by Flegel in 1958. Most cases are sporadic in origin, although it is typically described as an autosomal dominant disorder. In some series, the minority of cases was familial [1, 2]. It characteristically affects middle-aged or older men, with bilateral lesions mainly found on the back of the feet and the anterior aspects of the legs. More rarely, the disorder has been described on the upper extremities and, as an exception, also in other locations. Clinically, it is characterized by multiple red-brown papules almost symmetrically located on the dorsum of the feet and legs. The typical HLP lesion is a well-defined red to yellow-brown papule, about 2 to 5 mm in diameter, with a keratotic adherent scale. Occasionally, it has been described involving the upper extremities [1], hands [3], back [4], ears [1], palms [5], and oral mucosa. More rarely, lesions in the axillary folds, antecubital and popliteal fossae, and on the eyelids have been reported, in addition to the more common involvement of legs and hands [6]. A case with unilateral lesions on the lower extremity – existing since puberty – has also been described [7]. Histopathologic findings characteristically show an orthokeratotic and hyperkeratotic epidermis of decreased thickness. The dermis exhibits a lymphocytic infiltrate of
Acta Dermatovenerologica Croatica | 2012
Francisco Zúñiga Urbina; Emilio Sudy; Carlos Misad
Revista Española de Cirugía Oral y Maxilofacial | 2017
Estefanía Alvarez; Matias Gunther; Patricio Hernández; Carlos Misad; María Ángeles Fernandez; Francisca Donoso-Hofer
Acta Dermatovenerologica Croatica | 2014
Emilio Sudy; Francisco Zúñiga Urbina; Carlos Misad
Arch. argent. dermatol | 2001
Patricia López; Francisco Zúñiga Urbina; Guillermo Pino; Carlos Misad