12 cm is not abnormal for spleen size.
So I assume the 12cm from the CT is normal, but at the upper end? My ultrasound showed "trans spleen" at 5.79 CM. What is trans spleen? Is that thickness?
An abnormal spleen size is dependent on the study.
A spleen is considered abnormal if it is more than 13cm in length or greater than 5cm in thickness by ultrasound.
If a CT is performed, it is consider enlarged if is greater than 10cm in length.
Thus, depending on which study was performed, 12cm may either be enlarged, or at the upper range of normal.
Either CT scanning or ultrasound are acceptable modalities to measure for spleen size.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
http://www.straightfromthedoc.com