BACKGROUND: nephrolithiasis is the third most common urological pathology, followed by infections and prostatic pathologies. One of the treatment options is extracorporeal shock wave therapy (ESWT); it is a minimally invasive technique, easy to repeat, effective, with low morbidity and low cost. The aim of this study was to demonstrate the effectiveness of ESWT as a treatment for nephrolithiasis and its association with some factors. METHODS: We carried out a descriptive, observational, cross-sectional study with retrospective data, with patients diagnosed of nephrolithiasis and treated with ESWT at the Endourology Service of Hospital José Carrasco Arteaga, during the years 2015 and 2016. The sample was constituted of 146 patients. Data was Results are shown with frequencies and percentages in charts, Chi square was applied to measure the association between variables. RESULTS: The location of the stones was mainly intrarenal and on the left side. The mean size of the stones was 12.66 mm and the mean density was 996.97IU. After ESWT, tomographic control reported complete destruction of the stone in 22.6% of the patients and in almost a third of the patients there were no changes. After ESWL, most of the patients received expulsive treatment. 97% of the patients had no complications. CONCLUSION: The effectiveness of ESWL decreased with age, also it was less effective in women, but the association was not statistically significant. The location of the stone, and its size had statistically significant association with the effectiveness of the treatment; ureteral and small stones were completely destroyed more frequently than renal and big stones. The stone density had no association with LEOCH effectiveness.

Background: Cranioencephalic penetrating trauma (CPT) is caused by a sharp or short- pointed object that passes through the bone, dura mater, brain and other structures. Its incidence is unknown and few cases are described; penetrating injuries represent 0.4%, therefore there is no protocolized management. Case report: A 24-year-old male patient suffered penetrating trauma at left parietal region with a "knife"; he was sutured and sent home with analgesics. Five days after the trauma, he was admitted for headache, disorientation and decreased visual acuity. X-ray (XR) of Cranium evidencing a foreign body, therefore it is sent to a reference hospital. Evolution: The diagnosis is confirmed by a computerized tomography (CT) scan of the skull with 3-dimensional reconstruction (3D) plus CT angiography (angio CT), which shows "knife" in the left parietal region without vascular compromise. Neurosurgeons perform removal of the foreign body plus a dura mater plasty. Patient stay 12 days hospitalized with a favorable evolution and improvement of neurological symptomatology. Conclusion: CPT due to a knife is an emergency and there is no protocolized management. The removal of the foreign body must be done in a hospital for the risk of lesions of large vessels.

BACKGROUND: Mesenteric lymphangioma is a rare, benign congenital cystic tumor of the lym-phatic vessels, which occurs in less than 5% pf the cases at the abdomen. They appear most often during childhood. This tumor should be considered as a differential diagnosis of acute abdomen and other abdominal masses. CASE REPORT: A 6-year-old boy presented with abdominal pain and peritonism. He presented a low-grade fever, a positive rebound sign, as well as leukocytosis and neutrophilia. Ultrasono-graphy showed abundant free fluid in abdomen and pelvis. EVOLUTION: Exploratory laparotomy was performed, finding a cystic mass dependent on the greater omentum, this mass was resected. Histopathology was negative for malignancy and compatible with cystic lymphangioma, immunohistochemistry was positive for D2-40 marker. The patient evolved favorably without surgical complications and without evidence of recurrence up to one year of follow-up. CONCLUSION: Mesenteric cystic lymphangioma can present with symptoms of acute abdomen, it can also have a chronic evolution. Complete resection is the treatment of choice, currently minimally invasive procedures are performed with favorable results. Ultrasound is useful for long-term follow-up.

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El trauma penetrante craneoencefálico representa alrededor del 0.4% de los casos, pocos son los descritos en la literatura, por lo cual, no existe un manejo protocolizado del mismo.Describimos un caso de un paciente masculino de 24 años que sufre un trauma penetrante a nivel de región parietal izquierda con arma blanca “cuchillo”, dejando incrustada la hoja del mismo. La Tomografía computarizada simple de cráneo con reconstrucción en 3 dimensiones más angiografía, confirma el diagnóstico y descarta el compromiso vascular. Se realiza la extirpación completa del cuerpo extraño, sin complicaciones. Evolución favorable con mejoría de la sintomatología neurológica al alta.Este tipo de trauma es una emergencia que puede poner en riesgo la vida del paciente dependiendo del área afectada. La extirpación del cuerpo extraño debe realizarse en un medio hospitalario por la afectación de grandes vasos. Se debe tener una alta sospecha diagnóstica asociada al antecedente.