[Prevalence and asthma risk factors in municipalities of the State of Guerrero, Mexico].

Objective: To determine the incidence and the principal risk factors cause of asthma in scholar children between 4 to 6 years old and in adolescents students between 13 to 14 years old in six municipalities in Guerrero State, Mexico.

Material And Method: A cross-sectional study was carried out with 6,136 students (both groups) in the Acapulco municipality on the second semester of 1999 and with 1,128 students in municipalities near to Acapulco in the first semester of year 2000. The procedure was to use the questionnaire ISAAC to interview the mothers of the children between 4 to 6 years old, and apply directly interviews to the 12 to 14 years old group.

[Giant abdominal pseudocyst in patients with ventriculoperitoneal shunts].

Objective: To analyze the etiology, clinical picture, diagnostic methods, surgical treatment and follow up of a series of six patients with large abdominal pseudocyst as a complication of ventriculo-peritoneal shunts for cerebrospinal fluid relief.

Design: Study of a series of cases.

Patients And Methods: We studied six patients from 1992 to 1995 with large abdominal pseudocyst; there were four women and two men, with range of age from nine to 19 years, and average of 15.

[Uterine perforation and localization of an IUD in the bladder associated with bladder calculosis. Report of a case and review of the literature].

A case is reported of the presence of an intrauterine device into the bladder due to uterine perforation with calculus formation in a 39 year old woman, with two pregnancies after its installation. The patient was seen for complaints of pelvic pain, pollakiuria, dysuria and tenesmus, without uterine sintomatology. The case was studied in July of 1993 in the General Hospital "Vicente Guerrero" of Acapulco.