Results 61 to 70 of about 1,759 (175)

Out of the Ordinary, but Not Out of the Question: Atypia in Pancreatic Lesions Is Not Always Carcinoma

Cytopathology, EarlyView.
An incidental pancreatic lesion in a 69‐year‐old woman was sampled by EUS‐guided fine‐needle biopsy. Integrated cytopathological and histopathological evaluation with immunochemical staining supported organ‐preserving surgery. ABSTRACT Pancreatic perivascular epithelioid cell tumours (PEComas) are exceptionally rare mesenchymal neoplasms.
Maja Kebe Radulovic, Branislava Rankovic, Ajda Toni, Margareta Zlajpah, Darko Siuka   +4 more
wiley   +1 more source

Variation in the colour of the necrophagous fly, Prochyliza nigrimana (Diptera: Piophilidae): A case of seasonal polymorphism

European Journal of Entomology, 2011
The occurrence of colour polymorphism in wild populations of the necrophagous fly Prochyliza nigrimana (Diptera: Piophilidae) is recorded but never treated in detail.
Daniel MARTÍN-VEGA, Arturo BAZ
doaj   +1 more source

On the Potential Role of the Neural Crest Cells in Integrating Pigmentation Into Behavioral and Physiological Syndromes

Frontiers in Ecology and Evolution, 2020
Melanin pigments color the integument of vertebrates with shades of rufous, gray, and black. In numerous wild species, melanin-based coloration associates to different behavioral, physiological, and morphological traits, yet the proximate basis of such ...
Luis M. San-Jose, Alexandre Roulin
doaj   +1 more source

Ecological Genetics: A Key Gene for Mimicry and Melanism. [PDF]

, 2016
Mimicry and melanism in Lepidoptera provided the first convincing examples of natural selection in action. Genetic analysis has now shown that, surprisingly, mimicry in Heliconius butterflies and melanism in peppered moths are switched at precisely the ...
Mallet, J, Hoekstra, HE
core  

Available information on the occurrence of melanism in felid species.

, 2012
Bold types indicate species for which reliable evidence of melanism exists (including direct visual observation by E.E., photograph, or video). Numbers refer to bibliographic sources (see References).*Reference to melanism is not explicit.**Based on ...
Marilyn Menotti-Raymond (111123), Gregory S. Barsh (111121), Alexsandra Schneider (111114), Victor A. David (111117), Eduardo Eizirik (111124), Stephen J. O'Brien (53045), Warren E. Johnson (108641)   +6 more
core   +1 more source

Two rare tumors, one patient: The first report of bilateral mixed corticomedullary tumors of the adrenal gland

UroPrecision, EarlyView.
Reza Kaffash Nayeri, Farshad Banouei, Tina Darehzari, Benyamin Mohammadi   +3 more
wiley   +1 more source

Update of the S1‐guideline atypical fibroxanthoma (AFX) and pleomorphic dermal sarcoma (PDS)

JDDG: Journal der Deutschen Dermatologischen Gesellschaft, EarlyView.
Summary Atypical fibroxanthoma (AFX) and pleomorphic dermal sarcoma (PDS) are rare cutaneous neoplasms representing histomorphological, genetic as well as epigenetic variants of one disease spectrum. Both tumors manifest as nonspecific, often ulcerated nodules in chronically sun‐damaged skin. AFX is a well‐demarcated, often rapidly growing tumor.
Doris Helbig, Mirjana Ziemer, Diana Crisan, Edgar Dippel, Michael Erdmann, Uwe Hillen, Muemtaz Koeksal, Ulrike Leiter, Thomas Mentzel, Lars Erik Podleska, Jochen Utikal, Dagmar von Bubnoff, Carsten Weishaupt, Selma Ugurel   +13 more
wiley   +1 more source

The tale of the black viper: distribution and bioclimatic niche modelling of melanistic Vipera aspis in Italy

Acta Herpetologica
For decades, the evolutionary role of melanism in reptiles has been highly debated. According to the thermal melanism hypothesis, melanistic phenotypes should provide thermal advantages, thus positively impacting various biological aspects of these ...
Matteo R. Di Nicola, Francesco P. Faraone, Andrea V. Pozzi, Nicolò Borgianni, Lorenzo Laddaga, Jean-Lou M. C. Dorne, Gianmarco Minuti   +6 more
doaj   +1 more source

Integrated histopathological and molecular diagnostics reveal substantial diagnostic shifts in pediatric melanocytic tumors

JDDG: Journal der Deutschen Dermatologischen Gesellschaft, EarlyView.
Summary Background and objectives Pediatric melanocytic tumors are rare and biologically heterogeneous. Distinguishing melanomas from Spitz‐lineage tumors based on histomorphology alone is challenging and may lead to inadequate treatment. We aimed to characterize melanocytic tumors in pediatric patients enrolled in the German STEP registry and to ...
Michael Abele, Matthias Hahn, Gisela Metzler, Ulla Graeßner, Maja Haar, Thomas K. Eigentler, Andrea Forschner, Nadja Ballin, Christopher Schroeder, Dominik T. Schneider, Ines B. Brecht, Stephan Forchhammer   +11 more
wiley   +1 more source

Colour Pattern Variation and the Ecological Significance of Melanism in an Insular Mediterranean Population of Testudo hermanni

International Journal of Zoology
Colour pattern polymorphisms are widespread in reptiles and may have important ecological and evolutionary implications. This study confirms the presence of colour pattern polymorphisms in Testudo hermanni populations from Mallorca (Balearic Islands ...
Marta Salom-Oliver, Silvia Tejada, Samuel Pinya   +2 more
doaj   +1 more source