Diagnosis and management of pediatric primary bone tumors in the emergency department.

Musculoskeletal pain is a common chief complaint of children in the emergency department. Although nonspecific and typically benign, musculoskeletal pain should be investigated thoroughly with consideration for an underlying bone tumor, especially when it is a recurrent visit for pain. This issue reviews the specific signs, symptoms, and unique presentations the emergency clinician should know when evaluating a pediatric patient with musculoskeletal pain. Additionally, assessment of relevant radiographic findings to assist in differentiating bone tumors and guide further management are discussed.

The emergence of Y-chromosome haplogroup J1e among Arabic-speaking populations.

Haplogroup J1 is a prevalent Y-chromosome lineage within the Near East. We report the frequency and YSTR diversity data for its major sub-clade (J1e). The overall expansion time estimated from 453 chromosomes is 10,000 years. Moreover, the previously described J1 (DYS388=13) chromosomes, frequently found in the Caucasus and eastern Anatolian populations, were ancestral to J1e and displayed an expansion time of 9000 years. For J1e, the Zagros/Taurus mountain region displays the highest haplotype diversity, although the J1e frequency increases toward the peripheral Arabian Peninsula. The southerly pattern of decreasing expansion time estimates is consistent with the serial drift and founder effect processes. The first such migration is predicted to have occurred at the onset of the Neolithic, and accordingly J1e parallels the establishment of rain-fed agriculture and semi-nomadic herders throughout the Fertile Crescent. Subsequently, J1e lineages might have been involved in episodes of the expansion of pastoralists into arid habitats coinciding with the spread of Arabic and other Semitic-speaking populations.