ABSTRACT In this study, we reported the species composition and spatial distribution of Scyphomedusae and Cubomedusae from the southwestern Atlantic and Subantarctic region and reviewed the available knowledge of life history traits of these species. We gathered the literature records and presented new information collected from oceanographic and fishery surveys carried out between 1981 and 2017, encompassing an area of approximately 6,7 million km2 (32-60°S, 34-70°W). We confirmed the occurrence of 15 scyphozoans and 1 cubozoan species previously reported in the region. Lychnorhiza lucerna and Chrysaora lactea were the most numerous species, reaching the highest abundances/biomasses during summer/autumn period. Desmonema gaudichaudi, Chrysaora plocamia, and Periphylla periphylla were frequently observed in low abundances, reaching high numbers only occasionally. Phacellophora camtschatica, Aurelia sp., Drymonema gorgo, Atolla chuni, Stygiomedusa gigantea and Pelagia cf. noctiluca were observed always in low numbers. Atolla wyvillei, Stomolophus meleagris, Desmonema comatum and Tamoya haplonema were reported just a few times and mostly individually. Although new species/reports can be found as surveys are undertaken, these results are considered to be the reliable baseline for further ecological studies seeking to understand the ecological role that these jellyfish play in marine ecosystems.

RESUMO A quitina é um dos biopolímeros mais abundantes no planeta. A quitina foi quantificada em frações do seston, com a finalidade de obter a primeira caracterização deste polímero no Estuário de Bahía Blanca. A amostragem foi realizada durante o inverno e o verão em dois locais: em um canal de maré não impactado (Bahía del Medio, BM) e em um setor de descarga de esgoto (Canal Vieja, CV). Os maiores valores de quitina foram observados na fração seston <20 µM (6,1 mg L-1 em BM no verão). As frações remanescentes (20-60, 60-200, 200-500 e > 500 µM) não excederam ~ 1% de quitina total. A maior concentração de quitina no seston < 20 µM sugere que essa fração é um grande reservatório deste biopolímero, contribuindo para a matéria orgânica para os microorganismos na cadeia alimentar do Estuário de Bahía Blanca. Este é o primeiro estudo sobre as possíveis fontes de quitina em ecossistemas marinhos na Argentina.

ABSTRACT Chitin is one of the most abundant biopolymers in the planet. Chitin was quantified in seston fractions in order to obtain the first characterization of this polymer in the Bahía Blanca Estuary. Sampling was conducted at two sites: a non- impacted tidal channel -Bahía del Medio (BM)- and a sewage discharge sector -Canal Vieja (CV)-, during winter and summer. The highest values of chitin were observed in the seston fraction <20 µm (6.1 mg L-1 in BM in summer). The remaining larger fractions (20-60, 60-200, 200-500 and >500 µm) did not exceed ~1% of total chitin.. The higher concentration of chitin in seston <20 µm suggests that this fraction is a large reservoir of this biopolymer contributing to organic matter for microorganisms in the food web of the Bahía Blanca Estuary. This study is also the first report on the possible sources of chitin in Argentina marine ecosystems.

Mixotrophy is a feeding strategy by which some organisms combine autrotrophic and heterotrophic activities. The seasonal dynamics of the fve most common mixotrophic ciliates were studied monthly in surface layers of the inner and middle zone of the Bahía Blanca estuary, a nutrient-rich, shallow and highly turbid environment in Argentina, from January to December 2009. Temperature, salinity, turbidity and chlorophyll a were recorded, as well as the abundance and biomass of Strombidium capitatum, Strombidium acutum, Cyrtostrombidium sp., Lohmanniella oviformis and Tontonia appendiculariformis. The highest mixotrophic ciliate abundance was recorded during the austral winter (June-July) in the inner zone, meanwhile in the middle zone of the estuary the presence of these ciliates was almost nuil. The highest chlorophyll contribution derived from mixotrophic ciliates to total chlorophyll a ranged from 6% in the inner zone to 23% in the middle zone, both registered in autumn. The low abundance of mixotrophs in the middle zone of the estuary during the winter, as is usually observed in other coastal ecosystems, could be explained through a higher grazing pressure in this zone (top-down control) by mesozooplankton (e.g., copepods) in comparison to the inner zone. The secondary bloom of phytoplankton consistently observed during the last summers dominated by small sized diatoms and nanoplankton phytofagelates, could have sustained the high abundance of mixotrophic ciliates registered in the middle zone in autumn and summer.

Dinámica de los ciliados mixótrofos en dos zonas de un estuario templado y turbio en Sud América, Argentina. La mixotrofía es una estrategia de alimentación por medio de la cual un organismo combina la autotrofa y la heterotrofa. La dinámica estacional de cinco ciliados mixótrofos comúnmente presentes en las aguas superfciales de la zona interna y media del estuario de Bahía Blanca, Argentina, rico en nutrientes, somero y con alta turbidez, se estudió mensualmente desde enero a diciembre de 2009. Se registraron los valores de temperatura, salinidad, turbidez y clorofla a, así como también la abundancia y biomasa de Strombidium capitatum, Strombidium acutum, Cyrtostrombidium sp., Lohmanniella oviformis y Tontonia appendiculariformis. La abundancia más alta de los mixótrofos se registró en el invierno en la zona interna, mientras que en la zona media del estuario la presencia de estos ciliados fue casi nula. La contribución más alta de clorofla proveniente de los mixótrofos a la clorofla a total fue 6% en la zona interna y 23% en la zona media (ambas estimaciones registradas en otoño). La baja abundancia de mixótrofos en la zona media del estuario durante el invierno, como usualmente es observado en otros sistemas costeros, podría ser explicada por una presión de pastoreo elevada en esta zona (control de tipo "top-down") por parte de mesozooplancton (e.g., copépodos), en comparación con la zona interna. La foración secundaria del fitoplancton observada durante los últimos veranos, dominada por diatomeas de pequeño tamaño y ftofagelados del nanoplancton, podría haber sustentado la alta abundancia de ciliados mixótrofos que se registró en la zona media en otoño y verano.

A new case of lymphomatoid papulosis is reported as "what is your diagnosis", this is the second case in a short period of time.

Un nuevo caso de papulosis linfomatoide es presentado en forma de "haga su diagnóstico", el segundo publicado en corto tiempo.

BACKGROUND: lichen planopilar is a clinical variant of lichen planus, which affects the scalp and in the final stage which causes scarring alopecia, entailing a significant impact on quality of life. To date no shortage of published studies reporting surgical treatments. OBJECTIVE: effectiveness on hair transplant FUE technique and determine guidelines for optimum results is evaluated. MATERIAL AND METHOD: a woman with LLP seven years of evolution is presented. After scalp biopsy and a therapeutic meeting, he underwent a transplant. Photographic controls the 2.4 and six months were performed to determine success. RESULT: hair growth was observed after 2-3 months without visible scars in the donor area. CONCLUSION: technique FUE was a well tolerated and safe process to improve hair loss in LPP histologically shows a lack of inflammation (scarring stage).

El liquen plano pilar es una variante clínica del liquen plano, que afecta al cuero cabelludo donde su estadio final provoca una alopecia cicatrizal, que se acompaña en general, de un gran impacto negativo en la calidad de vida del enfermo. Hasta la fecha existe una gran escasez de estudios publicados, que informen tratamientos quirúrgicos. OBJETIVO: se evalúa la eficacia del trasplante de cabello bajo la técnica FUE (extracción de unidades foliculares) y determinar directrices para óptimos resultados. MATERIAL Y MÉTODO: se presenta una mujer con LPP de siete años de evolución. Después de una biopsia de cuero cabelludo y una sesión terapéutica, se procedió a un trasplante. Fueron realizados controles fotográficos a los dos, cuatro y seis meses para determinar éxito-fracaso. RESULTADO: se observó un crecimiento de cabello a partir de los 2-3 meses, sin cicatrices visibles en el área donante. CONCLUSIÓN: la técnica FUE es un proceso bien tolerado y seguro para mejorar la pérdida de cabello en un LPP, que histológicamente muestra una falta de inflamación (estadio cicatrizal). Esta técnica merece en nuestra opinión, más estudios a futuro.

Leiomyomas are rare tumors, piloleiomyomas are the most common clinical type and can be solitary or multiple which can be sporadic or familial. We report a case of multiple piloleiomyomas in the back of a young patient, in which studies were performed to rule out pathology associated.

Los leiomiomas son tumores infrecuentes, los piloleiomiomas son el tipo clínico más común y puede ser solitario o múltiple; este último puede ser esporádico o familiar. Presentamos un caso clínico de piloleiomiomas múltiples en dorso, en un paciente joven, a quien se le realizaron estudios para descartar una patología asociada.

A 38 years-old woman with a type B of lymphomatoid papulosis, is reported. A review of this peculiar disease and its unresolved questions is made. We make tribute to the dermatologist who described the disease and the initial name: Warren L. Macaulay and rhythmic paradoxical eruption, respectively.

Comunicamos el caso de una papulosis linfomatoide en una mujer de 38 años, el tipo histológico es B. Efectuamos una revisión de la entidad y sus interrogantes aún no resueltos. Se reivindica a su descubridor y el nombre inicial de su enfermedad: Warren L Macaulay y erupción rítmica paradojal, respectivamente.

56-years old woman who suffer a Crohn disease and had have treated with adalimumab, developed a disseminated and severe pyoderma gangrenosum. The response to meprednisona in standard doses was good. The ulcers and enteric-cutaneous fistulae cured.

Comunicamos un caso de pioderma gangrenoso extendido, en una paciente que padece una enfermedad de Crohn y se encontraba bajo tratamiento de la misma con un anti TNF: el adalimumab. La respuesta a la meprednisona fue satisfactoria.

A 22-old woman with an erythema induratum de Bazin-nodular vasculitis was reported, the tuberculin test was strongly positive measuring 17 mm of diameter. The patient had indolent ulcerated lesions, the therapy with four anti-tuberculous drugs results effective until now. The existence of the entity as unique or not as well the need of a wide biopsy is discussed.

Comunicamos un caso de eritema indurado de Bazin-vasculitis nodular en una mujer de 22 años, con una reacción fuertemente positiva al test de la tuberculina, lesiones ulceradas y una buena respuesta a la terapia anti tuberculosa hasta el momento. Se discute la ubicación nosológica de esta entidad y se enfatiza sobre la necesidad de una biopsia amplia adecuada.

We report a case of vulvar location pyoderma gangrenosum, in a 45 years-old woman, corresponding to a classical variant (ulcerous) idiopathic, to date.

Comunicamos un caso de pioderma gangrenoso de localización vulvar, en una mujer de 45 años, correspondiendo a una variante clásica (ulcerosa) idiomática, hasta la fecha.

Two cases of connective tissue nevi are reported, one of them with a mixed histopatologic pattern and one with elastin fibers diminished. None of the patients had systemic involvement or associated syndromes. The mixed connective tissue nevi type showed a linear distribution and has associated an acromic nevi.

Comunicamos dos casos de nevo del tejido conectivo, el primero con patrón histológico mixto y el segundo con predominio de alteraciones en las fibras elásticas. No se constataron síndromes ni patología sistémica asociada. Un caso presentó disposición linear y un nevo acrómico asociado.

A 86 years-old man with two melanomas "in situ" at both sides of his face, treated with imiquimod 5% are presented. The patient has a cardiovascular high risk due to isquemic heart disease, for that reason we start the treatment with imiquimod once a day for two months. The clinical and histological response was good and a follow up will be as long as we can.

Comunicamos un caso con dos melanomas "in situ", en un varón de 86 años, localizados en ambos lados de la cara con alto riesgo quirúrgico, quien fuera tratado con imiquimod al 5% una vez al día durante dos meses; los resultados hasta el momento, clínicos e histológicos han sido satisfactorios.

A case of mandibularis tori, lobular type is reported. Tori appear more frequently during middle age; it is well known in the dental literature but rarely mentioned in the dermatological one. Certain prevalence with respect certain ethnic groups has been observed, its surgical elimination are due mainly to prosthodontics reasons. The importance in the diagnosis is emphasized.

Presentamos un caso de torus mandibular, lobular; entidad frecuente en la consulta odontológica pero poco conocida o comunicada en la literatura dermatológica. Enfatizamos la necesidad de familiarizarse con este tipo de exostosis ósea, para no incurrir en estudios innecesarios al pensar en neoplasias malignas del piso de la boca.

We report a case in which a 21-week pregnant woman was stung by a Euscorpius flavicaudis (De Geer, 1778) scorpion. Symptoms and signs experienced by the patient were the same as those documented in the literature and with no ill-effects for the pregnancy. Envenoming was local and of low degree of intensity. It is important to emphasize that the patient was stung in her home, which differs from stings in most other parts of the world, in which scorpionism is mostly a risk in outdoor areas.