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Abdominal ultrasound examination of squirrel monkey. An elliptical, heterogeneously hyperechoic mass measuring approximately 3.25 × 2.25 cm (black lines) with an anechoic caudal portion can be seen within the lumen of uterus (white lines) just beneath the ventral surface of the caudal abdominal midline. Bar, 1.0 cm.
