Injection Site Reaction

**Definition:** Adverse reactions that occur initially at the site of injection or infusion. Milder type is confined to a local allergic flare reaction. A more severe reaction is caused by extravasation of VESICANTS from the blood vessel at the site of injection and can cause damage to the surrounding tissue. In tumor flare reaction symptoms involve well beyond the injection site such as an increase in the tumor size and tumor markers levels, bone pain, and HYPERCALCEMIA.

**Tree numbers:** - C23.550.340.500 - C25.100.781

**Synonyms:** - Injection Site Adverse Event - Injection Site Event