Axillary lymphadenopathy is a local reaction to mRNA COVID-19 vaccination. A 19-year-old healthy woman presented with a mass in the axilla diagnosed by ultrasonography as vaccine-induced hyperreactive lymphadenopathy. After two weeks, ultrasonography revealed that the lymph node had shrunk and that the blood flow signal in the hilum had disappeared.

A 73-year-old man reported left low back pain worsening since 2 weeks. Ten days prior, he felt indefinable anxiety, which abated, but the back pain persisted. His diaphoretic and vasoconstrictive hands suggested hypovolemic shock. Emergency computed tomography revealed impending rupture of an abdominal aortic aneurysm. Emergent surgery saved his life.