Obstructive acute renal failure is both a medical and a surgical emergency. The first treatment modality is urological by relief of obstruction. Post-obstructive diuresis is an abnormal condition of prolonged polyuria, involving both excessive solute and water loss, after acute drainage of obstructed urinary tract system. Physiopathology mechanisms are multiples. In most patients, diuresis will resolve once the kidneys normalize the volume and solute status and homeostasis is achieved. Post-obstructive diuresis can occur in up to 50% of patients with substantial urinary tract obstruction and can be life-threatening if it becomes pathologic. It can be detected by hourly monitoring of diuresis. Medical treatment of post-obstructive diuresis consists of oral or intravenous fluids adjusted to the findings of clinical examination, diuresis (volume and electrolytes) and close monitoring of patient. Fluid compensation should be tapered off over several days. Patients at high risk of post-obstructive diuresis should be identified and appropriately monitored.

Leiomyoma is a benign smooth muscle tumor which is rarely found in urethra. It often appears in females during their reproductive age (from menarche to menopause); the mean age of their appearance is approximately 41 years. Less than 100 cases were reported in the literature. We hereby report a case of a 52-year-old White woman who presented with complaints of dysuria and urinary tract infection. The mass was completely removed by transvaginal excision with a rim of normal tissue. Histopathological studies confirmed the urethral leiomyoma. The patient remained asymptomatic and there was no evidence of recurrence in the followup.

L’angiomyolipome rénal épithélioïde malin (AREM) est une entité pathologique rare longtemps considérée comme lésion hamartomateuse et dont le diagnostic positif est purement immuno-histochimique, microscopiquement, il se caractérise par des cellules mononuclées épithélioïdes a cytoplasme clair présentant des atypies cytonucléaires sévères, et exprimant les marqueurs musculaires lisses et mélanocytaires (HMB 45). Nous rapportons un cas rare d’AREM diagnostiqué après analyse anatomopathologique d’une tumeur retropéritonéale dont l’origine ne pourrait être précisée préalablement par la tomodensitométrie.

Les tumeurs para testiculaires sont des tumeurs rares et complexes qui ont une symptomatologie insidieuse et pauvre. Les formes bénignes représentent 70%. Le lipome para testiculaire étant le type le plus fréquent. L'examen clinique est peu spécifique. L'examen échographique est la pierre angulaire pour assoir le diagnostic. Le traitement chirurgical s'impose en cas de tumeur symptomatique, l'histologie étant habituellement typique permet la confirmation diagnostique. Le pronostic est bon malgré d’éventuelles récidives.

This paper aims to present a numerical model to calculate the power losses due to the friction phenomenon in spur geared transmissions which are highly used in many domestic and industrial applications. Since the increase of the power to be transmitted at high rotational speeds result in significant power losses and wear phenomenon, the latter must therefore be taken into account during the different phases especially when designing and choosing the materials of the gears since power losses have direct impact on the lifetime of the power transmitters. The present work gives a better understanding of how to numerically evaluate the friction power losses in spur gears and it is a preliminary study to the future work where the impact of friction and wear phenomena on the material lifetime and energy consumption will be discussed.