Acorn cyst sign explained

Acorn cyst sign is a radiologic sign indicating the presence of a benign uncomplicated cyst in ultrasound examinations of the breast.^[1] It consists of a deep anechoic fluid portion resembling an acorn, and a superficial echogenic layer resembling an acorn cap. This sign is helpful for radiologists to differentiate a benign uncomplicated cyst from a complex mass.^[2]

Notes and References

1. Web site: Themes . U. F. O. . Breast Ultrasound . Radiology Key . 4 June 2023 . 24 December 2015.
2. Zhang . Zhao . Maimone . Santo . I saw the sign: Go nuts, it's the “acorn cyst” sign . Clinical Imaging . 1 August 2023 . 100 . 60–63 . 10.1016/j.clinimag.2023.05.002 . 4 June 2023 . en . 0899-7071.