Biomedical subjects

N Stangos

Publications and source records attributed to N Stangos.

At least 19 recordsLinked to original sources

PubMed2004

Frontal sinus anatomical variations with potential consequences for the orbit. Study on cadavers.

Anatomical variations of the frontal sinuses that may play a role in the correlation between frontal sinusitis and orbital complications are described. There were used 18 cadavers during routine educational cadaver dissections, one month after theirs withdrawal from the formol basin. The dissections of the cranial cavity and the orbits were performed so as to reveal the frontal sinuses. An unusual bilateral posterior extension of the frontal sinus mucosa was found in two of the cadavers. The projection of the mucosa was covering half of the orbital roof in a 60 year old male and one third of the orbital roof in a 59 year old male. Among the other cadavers that presented normal variations of the frontal sinuses, there was also a case of a 57 year old female with a complete aplasia of the frontal sinuses. Such anatomical variations with unusual extension of the frontal sinuses above orbital roof may support the correlation between frontal sinusitis and the possible complications from the orbit and these cases may be considered as 'high risk' cases for orbital complications during a frontal sinusitis.

Female↗

PubMed2001

Retinoblastoma with an unusual presentation in a child with polydactyly. Clinical associations and genetic implications.

Retinoblastoma is the most common intraocular malignancy of childhood. It may rarely present with white spots on the iris and pseudohypopyon. We report a case of an 11-month old child with polydactyly with this presentation of retinoblastoma. There was no positive family history of the disease. Investigations included anterior segment examination under anaesthesia, fundoscopy with scleral indentation, A- and B-scan ultrasound and MRI examination of the head. This was a Reese Ellsworth group 5 retinoblastoma with an indication for enucleation. Pathology reports of the enucleated globe showed choroidal and ciliary body invasion. Therefore, subsequent chemotherapy treatment was undertaken. The retinoblastoma gene is located in the long arm of chromosome 13. Almost all familial and bilateral cases carry the abnormal gene. In unilateral isolated retinoblastomas--as in our case--most patients do not have a germinal mutation, however, only DNA analysis can safely exclude that. We also discuss possible factors having a link to both polydactyly and retinoblastoma.

Humans↗

PubMed2000

Role of electroretinography in the assessment of retinal function as an indicator of vitamin A status.

Hypovitaminosis A is associated with exocrine pancreatic insufficiency in cystic fibrosis. Peripheral retinal dysfunction is an early finding of vitamin A deficiency. We evaluated serum retinol and zinc as well as visual adaptation in 41 patients with cystic fibrosis, receiving generous pancreatic enzyme and micronutrient supplementation. Forty-one normal individuals matched for age and sex served as controls. Peripheral retinal function was measured by clinical electroretinography using an Electrophysiologic Personal Interfaced Computer and applying a standard protocol. Serum retinol in cystic fibrosis was significantly lower than that of the control group (0.30+/-0.01 versus 0.39+/-0.02 mg/l, p<0.001). Serum zinc concentrations were normal in the cystic fibrosis group (1.21+/-0.03 mg/l) and significantly higher than that of the control group (1.02+/-0.01 mg/l, p<0.001). The overall visual adaptation, however, was found to be normal and comparable in the two groups. It is concluded that, in cystic fibrosis, despite appropriate vitamin A supplementation, retinol serum concentration may be low. As serum retinol does not reflect vitamin A status, evaluation of visual adaptation may be a more appropriate way to monitor for vitamin A deficiency in cystic fibrosis.

Adolescent↗

PubMed1995

Contrast sensitivity evaluation in eyes predisposed to age-related macular degeneration and presenting normal visual acuity.

In order to test the validity of contrast sensitivity (CS) measurements in the early detection of visual impairment in age-related macular degeneration (AMD), we have evaluated the findings of CS in patients with drusen and normal visual acuity (17 eyes), as well as in the contralateral 'healthy' eye of patients with AMD (14 eyes). We also tried to estimate the validity of CS measurements in the prognosis of neovascular macular degeneration. The CS findings were evaluated in comparison to the findings of CS measurements in age-matched controls (32 eyes). CS loss is a constant finding in eyes with drusen and normal visual acuity. CS loss is more important at the middle range and high spatial frequencies. CS loss and degree of CS loss are not prognostic indicators of neovascular macular degeneration.

Adult↗

PubMed1989

[Can argon laser photocoagulation control senile macular degeneration?].

This study comprises 20 eyes with age related macular degeneration and subsequent subretinal neovascular membranes in which green argon laser photocoagulation was performed. After a follow-up ranging from 3 to 36 months (mean follow-up period 14.5 months), 7 (35%) of these eyes kept on having visual loss, 9 (45%) of them retained the initial vision and 4 (20%) improved (2 lines or more). Despite the small number of cases we consider our results quite encouraging and this specific therapy could be performed even on the purpose to obtain the minimum possible final central scotoma.

Aged↗

PubMed1985