Also known as: Severe allergic reaction
Merrill suffers multiple episodes of severe anaphylaxis triggered by ruptured echinococcal cysts containing tapeworms. The first attack causes respiratory arrest, and subsequent reactions worsen with each exposure.
Initially suspected as the cause of Merrill's abdominal pain following anaphylaxis, later determined to be related to parasitic cysts.
Also known as: Parasitic cysts from fox hunting
Merrill has multiple echinococcal cysts throughout his body including brain, pancreas, and other organs caused by tapeworm parasites. When cysts rupture, they trigger life-threatening allergic reactions requiring complex surgical removal.
Also known as: Broken arm
Evan presents with a severe forearm fracture from a minor fall, which is a pathologic fracture due to his underlying osteosarcoma weakening the bone.
Also known as: Bone cancer
Evan has stage four osteosarcoma, a terminal bone cancer that has metastasized to his chest cavity. Shaun initially suspects misdiagnosis but ultimately confirms the cancer is real. This is the central emotional storyline of the episode.
Also known as: Blood clot in lung
Evan develops a massive saddle embolism at the bifurcation of his pulmonary arteries, likely thrown from his fracture site, requiring emergency surgery to prevent death.