Adrenocortical function of Arctic-breeding glaucous gulls in relation to persistent organic pollutants

Unpredictable changes in the environment stimulate the avian hypothalamo-pituitary-adrenal axis to produce corticosterone, which induces behavioural and metabolic changes that enhance survival in the face of adverse environmental conditions. In addition to profound environmental perturbations, such as severe weather conditions and unpredictable food shortages, many Arctic-breeding birds are also confronted with chronic exposure to persistent organic pollutants (POPs), some of which are known to disrupt endocrine processes. This study investigated the adrenocortical function of a top predator in the Arctic marine environment, the glaucous gull (Larus hyperboreus). High concentrations of organochlorines, brominated flame retardants and metabolically-derived products in blood plasma of incubating glaucous gulls were associated with high baseline corticosterone concentrations in both sexes and a reduced stress response in males. Contaminant-related changes in corticosterone concentration occurred over and above differences in body condition and seasonal variation. Chronically high corticosterone concentrations and/or a compromised adrenocortical response to stress can have negative effects on the health of an individual. The results of the present study suggest that exposure to POPs may increase the vulnerability of glaucous gulls to environmental stressors and thus could potentially compromise their ability to adapt to the rapidly changing environmental conditions associated with climate change that are currently seen in the Arctic.     

Pathology of malignant skin tumours

The skin gives rise to a diverse spectrum of malignant tumours derived from the varied constituents of the epidermis and dermis. It is possible to discuss only a few of these in this article; the more common lesions derived from the epidermal keratinoctyes (basal and squamous cell carcinomas) together with melanomas (derived mainly from epidermal melanocytes) are presented. Some rarer but biologically aggressive tumours such as Merkel cell carcinoma and angiosarcoma are also discussed. Our understanding of the molecular biology of cutaneous tumours continues to evolve rapidly particularly for melanomas and in the coming years genetic profiling of individual tumours with targeted therapy is likely to play an important role in management.     

Long-term Vaginal Sequelae Secondary to Pediatric Pelvic Fracture

BackgroundPediatric pelvic fractures often appear radiographically benign despite significant injury to viscera. Vaginal injuries are rare, and therefore require a high index of suspicion.CaseA 26-year-old female patient who sustained a pelvic fracture in a motorcycle accident at the age of 10 presented with vaginal stenosis precluding sexual intercourse. Patient menstruated through a fistula in the distal vaginal vault. Radiographic and dye studies showed almost complete vaginal obstruction with heterotopic ossification. An extensive 30-year review of the literature was conducted looking for documented cases of vaginal injuries secondary to pelvic injury.Summary and ConclusionThis is the only recorded case of a long-term vaginal complication with subsequent heterotopic ossification secondary to pelvic fracture. Preventing debilitating long-term sequelae from vaginal injuries requires close patient follow-up and age-appropriate assessments.     

Functional studies on c.1347C>T,a polymorphism modulating phenotypic outcome in X-linked adrenoleukodystrophy

Tijdschrift voor Kindergeneeskunde -