Segmentation of brain image volumes using the data list management library.

The segmentation of head images is useful to detect neuroanatomical structures and to follow and quantify the evolution of several brain lesions. 2D images correspond to brain slices. The more images are used the higher the resolution obtained is, but more processing power is required and parallelism becomes desirable. We present a new approach to segmentation of brain image volumes using DLML (Data List Management Library), a tool developed by our team. We organise the integer numbers identifying images into a list, and our DLML version process them both in parallel and with dynamic load balancing transparently to the programmer. We compare the performance of our DLML version to other typical parallel approaches developed with MPI (master-slave and static data distribution), using cluster configurations with 4-32 processors.

Leontiasis ossea: a paleopathologic case report.

We describe the archeological and imaging findings of a unique specimen (skull and mandible) with leontiasis ossea (LO) that is on display in the National Museum of Anthropology and History in Mexico City. The specimen shows diffuse and irregular periosteal bone proliferation, which produces a grossly nodular appearance involving the neurocranium and the facial skeleton. Plain radiography and helical computed tomography revealed generalized hyperostosis obliterating the maxillary and sphenoidal sinuses and 2 exuberant bony masses arising from the maxilla with encroachment of the anterior nasal aperture.Currently, LO is a purely descriptive term applied to a variety of osseous conditions that have in common hyperostosis of craniofacial bones leading to a leonine appearance. Clinicians who see such lionlike facies should consider the main causes of LO, which include renal osteodystrophy, Paget disease and, as most likely in this specimen, fibrous dysplasia.

[Solitary rectal ulcer syndrome: report of 7 cases at the Salvador +Zubirán National Institute of Nutrition, from 1980 to 1992]. / Síndrome de úlcera rectal solitaria: informe de 7 casos en el Instituto Nacional de la Nutrición "Salvador Zubirán", de 1980 a 1992.

Solitary rectal ulcer syndrome (SRUS) is an unusual disorder which is seldom seen in our hospital. Considerable uncertainly remains concerning the cause, natural history, and management of this condition. During 1980-1992 period, 7 patients were seen at the Instituto Nacional de la Nutrición and the diagnosis was established on histological, sigmoidoscopic and clinical grounds. Most of the patients suffered rectal bleeding, abdominal pain, straining at defecation, tenemus and rectal mucus discharge. Laboratory results were non specific. Eighty-five percent has macroscopic ulcerations and these were found within 5.2 cm of the anal margin and usually situated anteriorly. Neither medical nor local surgical treatment consistently achieved relief of symptoms or healing of the lesion.