The simple bone cyst, as newly classified by WHO in 2005, is a lesion related to the jawbones. Therefore, it is not a cyst, since it is a cavity devoid of epithelial tissue. It is a rare pathology affecting the mandible more than the maxilla. Its onset occurs mainly during the first two decades of life, irrespective of sex. The purpose of our report is to exhibit the particular case of a 17-year-old male patient whose radiography showed an osteolytic lesion in his right mandibular body. Exploratory surgery and biopsy are performed showing a simple bone cyst. Since then, he is controlled through imaging studies, but presenting an atypical evolution, with its size increasing considerably within a 4-year follow-up.
Key words:Case report, simple bone cyst, hemorrhagic bone cyst, solitary bone cyst, idiophatic bone cyst, mandible.
RESUMENSe discute la historia taxonómica, relaciones de hospedante y distribución de 72 especies y 6 variedades del género Xylaria en diferentes comunidades vegetales de diez estados de la República Mexicana. Las especies fueron recolectadas e identificadas de 1986 a 1991. Se proponen futuras líneas de investigación sobre el género.
ABSTRACTThe taxonomic history, host relationships, and the distribution of 72 species and 6 varieties of the genus Xylaria collected in different plant communities of ten Mexican states are discussed. The species were collected and identified from 1986 to 1991. Future lines of research on the genus are posed.
INTRODUCCIONDe los 16 géneros de la familia Xylariaceae citados para México por San Martín y Rogers (1993), para Xylaria se conocen 105 especies (Pérez Silva, 1975;San Martín y Rogers, 1989;San Martín, 1992), de las cuales al menos doce son nuevas para la ciencia y posteriormente serán descritas por los autores. Para aproximadamente 35% de las 105 especies no es fácil tomar la decisión de si son nuevas o corresponden a taxa previamente descritos, debido a la inaccesibilidad o ausencia de muchos tipos, a la pobreza del material original y a las descripciones fragmentarias encontradas en la literatura.Xylaria se distingue por tener un estroma cilíndrico y estipitado, o bien peltado o pulvinado. Las formas peltadas o pulvinadas manifiestan su identidad genérica sólo después
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