Prescription Stimulant Misuse and Diversion Events Among College Students: A Qualitative Study.

Prescription stimulant misuse and diversion are interrelated behaviors: diversion increases the availability of stimulants for misuse, and persons who misuse are also more likely to divert. To date, research has examined these behaviors using a primarily quantitative lens. We led a qualitative investigation to better understand misuse and diversion events. Data are from a diverse southern California campus where we interviewed students who misuse and/or divert prescription stimulants (32 total interviews: 16 interviews with students who had a history of misuse, and 16 different interviews with students who had a history of diversion). We analyzed interview data inductively. We identified the following themes about misuse and diversion events, several of which intersected during interviews: medication surplus, diversion and misuse hubs, ease of behavior performance, academic stress, and other drugs commonly involved. For diversion, altruism and monetary gain were juxtaposed themes. Across themes, friends and family were influential figures. Implications for prevention, intervention, and future research directions are discussed.

Diagnostic accuracy of neuroimaging in pediatric optic chiasm/sellar/suprasellar tumors.

Preoperative diagnosis for tumors arising in the optic chiasm/sellar/suprasellar region in children is helpful to determine surgical necessity and approach, given the high operative risk in this area. We evaluated the ability to differentiate tumor type by preoperative neuroimaging. Thirty-eight of 53 tumors were correctly diagnosed by neuroimaging based on final pathologic diagnosis (prediction accuracy 72%). Prediction accuracies were 87% (20/23) for craniopharyngioma, 79% (11/14) for optic pathway glioma, 64% (7/11) for germ cell tumor, and 0% (0/5) for Langerhans cell histiocytosis. Diagnosis of optic chiasm/sellar/suprasellar tumors in children by imaging alone should be considered when biopsy is considered high risk.

Fetal Lung Volumes by MRI: Normal Weekly Values From 18 Through 38 Weeks' Gestation.

OBJECTIVE: The purpose of this study is to establish normal total fetal lung volume reference ranges from 18 to 38 weeks' gestation at 1-week intervals. MATERIALS AND METHODS: A retrospective analysis of 665 patients who underwent fetal MRI at two tertiary fetal centers from 2001 to 2013 was performed. Total fetal lung volume was measured in at least two planes, either manually or using a 3D workstation. The mean, median, SD, minimum, maximum, and lower and upper quartiles for total fetal lung volume were determined per gestational week. A t test was used to compare our values to previously reported values. A new formula to calculate total fetal lung volume derived from our data was created using a regression model. Comparisons between total fetal lung volume obtained by different imaging planes and manual versus semiautomatic calculation were also performed. RESULTS: The mean normal total fetal lung volume showed a weekly increase from 18 through 35 weeks' gestation. Means were compared with the expected total fetal lung volume generated by the Rypens formula, showing statistically significant lower mean total fetal lung volume from week 19 to week 22 (p < 0.05). Comparison between our data-derived total fetal lung volume formula and the Rypens formula showed very similar values at every gestational age. No difference in total fetal lung volume was seen when comparing imaging planes or manual versus semiautomatic methods. CONCLUSION: Measured mean total fetal lung volume values at 19-22 weeks are significantly lower than those predicted by the Rypens formula. Therefore, we propose preferential use of our values for prenatal counseling and delivery planning.

Imaging of congenital central nervous system infections.

Congenital central nervous system (CNS) infections are a cause of significant morbidity and mortality. The recent Zika virus outbreak raised awareness of congenital CNS infections. Imaging can be effective in diagnosing the presence and severity of infection. In this paper we review the clinical presentations and imaging characteristics of several common and less common congenital CNS infections.