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The dorsal metacarpal veins are frequently cannulated. Cannulation success is determined by several variable anatomic features. The objective of this study is to classify, for the first time, the anatomic variants of the dorsal metacarpal veins. In this cross-sectional study, 520 university students and staff were conveniently recruited. The dorsal metacarpal veins in 1040 hands were studied. Venous visibility was enhanced by either tourniquet application or near-infrared illumination. Variant patterns of the dorsal metacarpal veins were classified. The final analysis included 726 hands, for an exclusion rate of 30 %. Eight pattern types were identified. Three anatomic features informed the variation. Bilateral symmetry of the dorsal metacarpal veins was present in 352 participants (83 % of the total). The overall frequency distribution of variants in both hands was similar (P = 0.8). The frequency distribution of variants was subject to sexual dimorphism (P = 0.001), ethnic variation (P

En el Departamento de Radiologia del Hospital de la Universidad de Jordania, Amman, Jordania, se llevo a cabo un estudio prospectivo entre el mes de julio de 2001 al mes de julio del 2015. Durante ese periodo se descubrieron cinco casos de vena cava inferior doble (VCID) en una cohorte de 7722 pacientes (3861 hombres y mujeres 3861, de 49,5 ± 16,9 anos, con un rango de edad de 16-78 anos). Los casos fueron diagnosticados por medio de venografia por tomografia computada espiral con contraste (TCV) y confirmados por medio de venografia por estudio tridimensional turbo. La mayoria de los pacientes (3166, 41 %) fueron remitidos para estadificacion y seguimiento de tumores malignos. Se presentaron complicaciones postoperatorias en 1777 pacientes (23 %), dolor abdominal no especificado en 1467 (19 %), evaluacion preoperatoria en 849 (11 %) y traumatismo en 463 pacientes (6 %). La venografia por resonancia magnetica (RMV) mostro una mayor sensibilidad, precision diagnostica, y resultando no invasiva para la evaluacion de la vena cava inferior (VCI). RMV es una modalidad mas util, no invasiva para la evaluacion de la VCI. VCID es una anomalia frecuente, encontrandose en nuestro estudio una incidencia de 0,064 %. Ademas se realizo una revision de la literatura, la embriogenesis, y la importancia de esta anomalia. Tambien, se proporcionaron cifras de muestras de los casos relevantes.

SUMMARY: The foramen magnum is morphometrically typified by two perpendicular diameters and a distinct margin. This important anatomical landmark is subject to high interindividual variation. The objective of this study was to evaluate the dimensions and morphology of the foramen magnum in a Jordanian population. In this retrospective study, 247 individuals were consecutively sampled using the institutional picture archiving and communication system. The anteroposterior and transverse diameters of the foramen magnum were measured; the foramen magnum index was calculated; and, the shape of the foramen magnum was visually assessed. The sex-pooled anteroposterior and transverse diameters were 35.1 ± 3.2 mm and 29.3 ± 2.5 mm, respectively. The sex-pooled foramen magnum index was 1.20 ± 0.10. The diameters were significantly different (P