Ocular tumor patterns.
The use of choroidal excavation and vascular pulsations in the ultrasonic diagnosis of tumors has been a helpful diagnostic feature. Evaluation of choroidal tumors is presently performed with A-, B- and M-scan techniques. Solid tumors of high homogeneity produce characteristic hollows or acoustic quiet zones that replace the normal choroidal pattern. M-scan patterns of vascular pulsations are also useful in demonstrating vascularity or choroidal tumors. Color displays accentuate amplitude variations in ocular tumors.
D001808:Blood Vessels / Q000503:physiopathology; D002830:Choroid Neoplasms / Q000175:diagnosis* / Q000503:physiopathology; D003116:Color; D003937:Diagnosis, Differential; D006391:Hemangioma / Q000175:diagnosis; D006801:Humans; D008545:Melanoma / Q000175:diagnosis* / Q000503:physiopathology; D009362:Neoplasm Metastasis / Q000175:diagnosis; D011674:Pulse; D012119:Respiration; D012166:Retinal Hemorrhage / Q000175:diagnosis; D014465:Ultrasonics / Q000379:methods; D014463:Ultrasonography