piano key appearance
HISTOPATHOLOGY
A term of art referring to the appearance of the even rows of subnuclear vacuoles–fancifully likened to piano keys–seen by low-power light microscopy in endometrial biopsies on day 17 in women with a normal menstrual period.
Reference Endometrial Biopsy Interpretation, Brigham and Women’s Hospital, Boston, 22-23.11.2003
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