Lower abdominal pain on left side in a boy?

How old is he? Undescended testes on left side, testes. Mass arising from undescended testes, enlarged lymphnodes on left from testicle infection in scrotum, conditions related to testicle going inside the pelvis like epididymitis and spermatic cord inflammation which drain into testicular lymphnodes and few to groin lymphnodes. R/o conditions like lymyphoma , others like mesenteric cysts, lymphocele- lymph vs.