To break it down, here are definitions of all of those words, and then a summary:
Bilateral: On both sides, as opposed to unilateral (on one side).
Hilar: Of or relating to the hilum, presumably...
It's the swelling of the lymph nodes located outside or behind one of the the peritoneums. The parietal peritoneum is the portion that lines the abdominal and pelvic cavities. The visceral peritoneum...
Yes. Thyroiditis is an inflammation of the thyroid gland that can be from a variety of causes, and the term adenopathy is an 'umbrella' term that is used to mean a dysfunction of a gland in the body....