Quantitative Evans index estimation using ultrasonographic measurement of the optic nerve sheath diameter in supine and upright position

OBJECTIVES

We aimed to quantitatively assess Evans index (EI) using ultrasonographic optic nerve sheath diameter (ONSD) measurements in supine and upright position in normal pressure hydrocephalus (NPH) patients.

METHODS

Ultrasonographically ONSD was measured in a supine and upright position before and 4-5 days after the ventriculoperitoneal shunt surgery. The changes of the ONSD between supine and upright positions were calculated as ∆ONSD = sONSD-uONSD and as the variation ONSD_V = 100% × [(sONSD - uONSD)/sONSD]. Multiple linear regression analyses were conducted to assess associations between EI and the variation of ONSD. We derived the mathematical function to predict EI. Bland-Altman analysis was applied to evaluate the accuracy and precision of the EI prediction.

RESULTS

Thirteen adult patients (mean age 61.8 ± 11.1 (SD) years; 6 (46%) female) undergone VP shunt implantation for NPH. The mean EI was 0.432 (95% CI, 0.393-0.471) preoperatively and 0.419 (95% CI, 0.373-0.466) postoperatively (p = 0.066). There is a decrease of the ONSD during positional changes from supine to upright position and pre- and postoperative EI correlated with preoperative variation ONSD_V1 (r =  - 0.610 and - 0.648, p < 0.05). The mathematical function for preoperative EI estimation was EI_preop = 0.504 - 0.022 × ONSD_V1 + 0.101 × gender (M = 0; W = 1), (Durbin-Watson value = 1.94), and for postoperative was EI_postop = 0.487 - 0.022 × ONSD_V1 + 0.117 × gender; (Durbin-Watson value 2.23).

CONCLUSIONS

Ultrasonographic ONSD measurements in supine and upright position provide a potential method to quantify EI that can be conducted at the bedside.

Extended pterional approach for initial surgical management of craniopharyngiomas: a case series

AIM

Treatment of craniopharyngiomas remains challenging. The aim of this study was to evaluate results of initial surgical management of craniopharyngiomas via the extended pterional approach.

MATERIAL AND METHODS

Nineteen patients (10 female; median age of 23 years; ranging from 10 months to 67 years) undergone initial surgery for craniopharyngiomas through the extended pterional approach. Data were retrospectively collected by reviewing medical records, operative reports and imaging results.

RESULTS

The median size of craniopharyngiomas was 3.2 cm (range 1.3 - 4.8). Visual deterioration (n=12) and headache (n=10) were the most common symptoms on admission. After surgery, one patient died due to medical complications, 12 patients developed diabetes insipidus and eight patients developed anterior pituitary dysfunction. Median follow-up period was 9 years (range 2 - 13). Patients with progression of craniopharyngioma (n=5) when compared to patients without progression of craniopharyngioma (n=14) were significantly younger at the time of surgery, had less visual deterioration before surgery and had higher rates of not changed vision after surgery. Children had larger craniopharyngiomas when compared to adults.

CONCLUSION

Initial surgery for craniopharyngioma via the extended pterional approach is a safe and effective treatment option with low postoperative mortality, and acceptable postoperative morbidity and recurrence rate.