¿Neumonía redonda o hallazgo casual? / Round pneumonia or incidental finding?

El diagnóstico diferencial de las neumonías redondas es amplio y engloba enfermedades infecciosas, neoplásicas y congénitas. La paciente que se presenta a continuación fue diagnosticada de una neumonía redonda con una clínica e imagen radiológica compatible. Sin embargo, el diagnóstico definitivo fue una malformación vascular. Este caso permite reflexionar sobre la importancia de valorar distintitos diagnósticos ante una condensación redondeada y sobre la necesidad o no de realizar una radiografía de control en estos casos. Además, lo más original del caso radica en el tratamiento que recibió para la malformación vascular, que no estaba descrito previamente: el propranolol (AU)

The differential diagnosis of round pneumonia is broad and includes infectious, malignant, and congenital diseases. The patient presented below received a diagnosis of round pneumonia based on compatible clinical and radiological findings; however, the definitive diagnosis was a vascular malformation. This case allows us to reflect on the importance of considering alternative diagnoses in the presence of round opacities in the lung and when performance of a follow-up X-ray is or not required in such cases. In addition, the most original aspect of this case lies in the treatment provided for the vascular malformation, which has not been previously described: propranolol. (AU)

Relationship of medial gastrocnemius relative fascicle excursion and ankle joint power and work performance during gait in typically developing children: A cross-sectional study.

Muscle fascicles lengthen in response to chronic passive stretch through in-series sarcomere addition in order to maintain an optimum sarcomere length. In turn, the muscles' force generating capacity, maximum excursion, and contraction velocity is enhanced. Thus, longer fascicles suggest a greater capacity to develop joint power and work. However, static fascicle length measurements may not be taking sarcomere length differences into account. Thus, we considered relative fascicle excursions through passive ankle dorsiflexion may better correlate with the capacity to generate joint power and work than fascicle length. Therefore, the aim of the present study was to determine if medial gastrocnemius relative fascicle excursions correlate with ankle joint power and work generation during gait in typically developing children. A sample of typically developing children (n = 10) were recruited for this study and data analysis was carried out on 20 legs. Medial gastrocnemius relative fascicle excursion from resting joint angle to maximum dorsiflexion was estimated from trigonometric relations of medial gastrocnemius pennation angle and thickness obtained from B-mode real-time ultrasonography. Furthermore, a three-dimensional motion capture system was used to obtain ankle joint work and power during the stance phase of gait. Significant correlations were found between relative fascicle excursion and peak power absorption (-) r(14) = -0.61, P = .012 accounting for 31% variability, positive work r(18) = 0.56, P = .021 accounting for 31% variability, and late stance positive work r(15) = 0.51, P = .037 accounting for 26% variability. The large unexplained variance may be attributed to mechanics of neighboring structures (e.g., soleus or Achilles tendon mechanics) and proximal joint kinetics which may also contribute to ankle joint power and work performance, and were not taken into account. Further studies are encouraged to provide greater insight on the relationship between relative fascicle excursions and joint function.