血塊

1. Origins, structure, and basic meaning

• Structure: 血塊(けっかい) means a mass of clotted blood.
• Basic usage: It describes surgically removing a clot that was blocking a blood vessel.
  • 手術で血管を塞いでいた血塊を取り除いた。

2. Common pitfalls and similar expressions

• Technical and plain expressions
  • 血塊 suits medical or laboratory contexts. A plain-language way of expressing it is 血の塊(ちのかたまり).