I have enlarged periportal lymph nodes which have remained the same size for the past 6 months. i have antiphospholipid syndrome. could that cause it?

APLAS and lymph node: Antiphospholipid antibody syndrome can cause strokes, heart attacks, miscarriages, deep venous thromboses, pulmonary emboli, livedo reticularis, chorea, and several other things but doesn't cause lymphadenopathy per se. It is much more likely that some underlying condition is causing both the lymph nodes and the abnormal antibodies. Please see a hematologist to sort out what could be going on.