Presence of human papillomavirus in the buccal mucosa of blood donors.

Objective: To determine the presence of human papillomavirus (HPV) in the oral mucosa of blood donors (BD) and risk factors associated with HPV and oral cancer.

Materials And Methods: Prospective cross-sectional study, population matched to BD from the National Cancer Institute, Mexico for HPV identification in oral cytological samples using the CLART® Human Papillomavirus 2 Kit (35 genotypes) and risk factors.

Results: Of 352 BD with signed informed consent, 285 were selected by simple randomization.

Uterine contractility as a cause of amniotic band syndrome.

Objective: The objective of this study was to determine whether puncturing the uterine wall and the amnion causes uterine contractions that result in fetal abnormalities.

Materials And Methods: An experimental study was performed using four groups of three female rabbits. Group A received a puncture of the amniotic membranes of one of the uteri on day 15 of gestation followed by group B on day 16, group C on day 17, and group D on day 18.

Lack of IgG antibody seropositivity to Borrelia burgdorferi in patients with Parry-Romberg syndrome and linear morphea en coup de sabre in Mexico.

Background: Progressive hemifacial atrophy or Parry-Romberg Syndrome (PRS) is a rare, acquired, progressive dysplasia of subcutaneous tissue and bone characterized by unilateral facial involvement. Its etiology is unknown, but theories about its pathogenesis include infectious, degenerative, autoimmune, and traumatic causes among others. The causal relationship of PRS and linear morphea en coup de sabre (LMCS) with Borrelia burgdorferi infection remains controversial.

[Jejunal intussusceptions as a lead point ectopic pancreatic tissue in a 1-year-old male. Case report].

Background: intussusception is the most common cause of acute bowel obstruction in infants and young children. Incidence has been reported as 1.5 to 4 cases per 1,000 live births.

Immunoexpression of matrix metalloproteinases and their inhibitors in different areas of oral squamous cell carcinoma.

Background: Several studies have shown the participation of MMPs in oral squamous cell carcinoma, the most frequent malignant neoplasm of the oral cavity. The expression of some MMPs correlates with a more aggressive biological behaviour. The objective of this study was to determine which MMPs and TIMPs were expressed in both neoplastic and peritumoural stromal cells in different histopathology areas.

Effective analgesic between acetominophen + B vitamins vs. acetominophen in pediatric ambulatory surgery.

Background: analgesics in pediatric ambulatory surgery must be safe and effective. Acetominophen is safe with moderate efficacy; therefore, we searched for other drugs. In preclinical trials, improved efficacy was reported with the combination of acetaminophen + B vitamins.

Congenital stenosis of the colon with foreign bodies. Case report.

Background: Colonic stenosis is rarely seen in pediatric practice. Its incidence has been reported as 1/40,000 births. Ascending and transverse colon are the most common sites affected.

Subhepatic appendicitis with subdiaphragmatic abscess in a pediatric patient without intestinal malrotation: case report.

Background: Acute subhepatic appendicitis in children is an uncommon presentation. It is usually associated with intestinal malrotation. When these conditions are met, accurate diagnosis and early management decisions are delayed.

Interventions for central giant cell granuloma (CGCG) of the jaws.

Background: Central giant cell granuloma (CGCG) of the jaws is a rare benign tumour with an unknown aetiology accounting for up to 7% of tumours in the mandible (lower jaw) and the maxilla (upper jaw).

Objectives: This systematic review focused on assessing the effects of primary non-surgical versus primary surgical interventions or any other treatment or placebo for treating central giant cell granuloma of the jaws.

Search Strategy: Relevant randomised controlled trials (RCTs) were identified from the Cochrane Oral Health Group's Trials Register (July 2009); CENTRAL (The Cochrane Library 2009, Issue 3); MEDLINE (1950 to July 2009); EMBASE (1980 to July 2009); and LILACS (1982 to July 2009).

Breast malignant phyllodes tumour metastasising to soft tissues of oral cavity.

Metastases from infraclavicular neoplasms to the oral cavity are rare, and the anatomical structures most frequently affected are the maxillae. The primary sites that develop metastases to head and neck include lung, breast, liver, thyroid gland, kidney and melanomas, among others. The breast is one of the usual primary regions that can present them.

Mutational analysis of K-ras and Ras protein expression in larynx squamous cell carcinoma.

The ras gene family (H, K and N-ras) encodes the Ras protein, a GTPase-activating protein that regulates several signal transduction pathways including cellular proliferation and differentiation. Mutations in codons 12, 13 and 61 of the ras genes constitute one of the most frequent alterations in human cancer. In the Western Hemisphere, a low frequency of mutations in these genes has been observed in head and neck carcinomas; a higher frequency has been found in countries such as India and Taiwan.

Solitary fibrous tumor of the parotid region. Report of a case and review of the literature.

Solitary fibrous tumor is a well-recognized entity that most commonly involves the pleura; however, it has been recently described in other locations including the head and neck region, where it occurs as a slowly growing and well-circumscribed lesion. Due to its low frequency it may be confused with other neoplasms, and for this reason microscopic, ultrastructural and immunohistochemical features are necessary to establish its diagnosis. Prognosis of this tumor depends on its location and size.

Malignant odontogenic tumors. A retrospective and collaborative study of seven cases.

The frequency, clinico-pathologic features and outcome of malignant odontogenic tumors diagnosed according to the current WHO classification in three pathology services in Mexico City are presented. There were seven cases (5 male and 2 female patients), which represent less than 4% of all odontogenic tumors diagnosed in these services. There were six odontogenic carcinomas (two malignant ameloblastomas, two clear cell odontogenic carcinomas, one primary intraosseous carcinoma and one carcinoma arising in an odontogenic cyst) and one ameloblastic fibrosarcoma.