Case 1 B-Scan: The Definitive Diagnosis
Case 2 Child With Congenital Glaucoma
Case 3 Difficult A-scan - Staphyloma
Case 4 Difficult A-scan - Retinal Detachment
Case 5 Contact vs. Immersion A-Scan
Case 6 Malignancy or Benign Lesion?

An elderly gentleman presented to a University retina department. Following clinical and ultrasound examination the patient was thought to have a large suspicious lesion. The oncologist was unavailable at the moment, but an experienced echographer was able to repeat the ultrasound exam and included Standardized-equivalent Diagnostic A-scan. The A-scan showed an echo pattern consistent with a disciform lesion as opposed to the melanoma that was suspected. When the oncologist returned to evaluate the electronically stored scans and a repeat real-time exam, the diagnosis of a disciform lesion was confirmed.

click images for larger view

	Vertical transverse at 9:00. At reduced gain, the lesion still produces highly reflective echoes that are irregular in brightness. There is no shadowing at the base of the tumor, often seen in large melanomas. Diffuse vitreous opacities are also observed.
	Standardized-equivalent Diagnostic A-scan demonstrates irregular internal reflectivity characteristic of a benign disciform lesion.