Collagen balls

collagen balls:
Spherical masses of collagen surrounded by benign, flattened mesothelial cells, known as collagen balls, are seen in up to 50% of peritoneal washings.Aqua in color with the Papanicolaou stain, they have round or bosselated contours. They are usually few in number, but occasionally they can be

abundant. They have no known significance (and therefore do not deserve mention on a cytology report). It has been suggested that they result from a pinching off of mesothelial-lined stromal projections known as “micropapillomatosis” on the
surface of the ovaries.