Welcome to JA and thanks for asking
Splenic calcification can have numerous causes.
It can be due to some previous infections or even some calcified lymph nodes.
Common causes include histoplasmosis , tuberculosis, brucellosis (Brucella abortus), candidiasis, Pneumocystis jiroveci and sickle cell disease. Single or smaller numbers of calcified lesions can also be seen following trauma, ischaemia/infarction. Calcification can also be associated with splenic haemangiomas and cysts. Non Hodgkin Lymphoma of spleen can also give rise to such calcification.
An ultrasound is just one investigation and not confirmatory for any of these. To see the exact cause you need further evaluation. Physical examination and further investigations as guided by your history and physical examination. At time it can just be a sequel of some previous infection and nothing more than that to be of any kind of danger to you. So see the doctor for further evaluation and investigations accordingly.
Feel free to ask if you have any more question and till you are satisfied
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