Distribution and Clinical Characteristics of Periorbital Infantile Hemangiomas

Background: Periorbital infantile hemangiomas (POIHs) are associated with a high incidence of visual complications. Objective(s): To analyze the sites of predilection of POIHs and to determine whether certain sites require earlier intervention due to their higher rate of visual complications. Methods: A retrospective case series study was conducted on patients from two tertiary care centers for 25 years. The location of POIHs was determined from clinical photographs, medical records, and radiological studies. The presence or absence of anisometropic astigmatism (anisoastigmatism) and amblyopia was recorded. Data were analyzed using a chi-square test. Results: There were 486 patients, of which 302 patients had ophthalmology evaluations and 245 patients had refractive error data. At presentation, 10% of patients already had amblyopia and 44% had anisoastigmatism. Medial eyelid lesions had the highest risk of developing anisoastigmatism (anisoastigmatism correlates with eyelid position, p = 0.0001). Segmental and upper medial lesions had the highest risk of amblyopia at initial evaluation. Conclusion: The site of POIH is an important indicator for developing clinically significant anisoastigmatism and amblyopia, underlining the need for early ophthalmologic assessment and management.

Crystal blocking measurements of the time delay of fission induced by 32S, 48Ti, and 58Ni bombardment of W

The time delay in fission induced by bombardment of W with 180 MeV 32S, 240-255 MeV 48Ti, and 315-375 MeV 58Ni has been measured by observation of crystal blocking. There is a clear narrowing and a small increase in the minimum yield of the angular dips for fission compared with scaled dips for elastically scattered ions. This is interpreted as a fission delay of about 2 as, only weakly dependent on energy and atomic number. The delay is longer by 1 to 2 orders of magnitude than obtained from standard interpretations of measurements of prescission neutrons and giant-dipole-resonance gamma rays and from calculations of the nuclear dynamics in heavy-ion reactions.