Other causes of mesenteric adenopathy have typical clinical symptoms and do not produce the large bulky adenopathy that results in the sandwich sign. Mesenteric lymphomas can also show retroperitoneal adenopathy and increased attenuation of the mesentery (misty mesentery). In our case, the absence of symptoms, imaging findings of mesenteric soft-tissue nodules producing sandwich sign and retroperitoneal lymph nodes made lymphoma the most likely diagnosis.
If you're rhesus positive (RhD positive), it means that a protein (D antigen) is found on the surface of your red blood cells. If you do not have the D antigen, you will be rhesus negative (RhD negative). Most people are rhesus positive (NHS BT 2014) .
The A and B antigens are very common, making it easy to classify people by which antigen they have, while people with Type O blood have neither antigen. The negative or positive symbol after the blood type indicates the presence or lack thereof of the Rhesus Factor.