Various malignant tumors of the liver, especially liver angiosarcoma, have been described after occupational exposure to vinyl chloride monomer. We present the case records and pathologic findings of two plastic industry workers who had been exposed to high concentrations of vinyl chloride. These workers developed hepatic neoplasms, angiosarcoma, or hemangiopericytoma. We discuss the histogenesis of these tumors; the common vascular origin and the mutual transformation of these two tumors suggest that the hemangiopericytoma may also have developed during occupational exposure to high concentrations of vinyl chloride monomer. ImagesFigure 1Figure 2

We compare the effects of spherical aberration on the penetration depth of single-photon and two-photon excitation for instances in which the aberration is caused by the refractive-index mismatch when a beam is focused through an interface. It is shown both theoretically and experimentally that two-photon fluorescence imaging experiences less spherical aberration and can thus propagate to a deeper depth within a thick medium.

The objective of this study was to profile trauma related psychiatric symptoms in a group of refugees not seeking mental health services and to consider the services implications. The study involved research assessments of two groups of Bosnian refugees: those who have not presented for mental health services and those who have. A total of 28 of 41 nonpresenters (70%) met symptom criteria for posttraumatic stress disorder (PTSD) diagnosis. All service presenters (N = 29) met symptom criteria for PTSD diagnosis. The group that did not present for services reported substantial but lower trauma exposure, PTSD symptom severity, and depression symptom severity. They had significant differences on all subscales of the MOS SF-36, indicating better health status. We concluded that those who do not seek services have substantial symptom levels, but their self-concept appears to be less oriented toward illness and help seeking. Innovative access, engagement, and preventive interventions are needed to address those who have symptoms but do not readily seek help for trauma mental health services.