Teratoma Portrait
Character Information
Character Type Boss
Floors of


The Womb
First Stage Health 60
Second Stage Health 15
Third Stage Health 8
Items Dropped Boss Pool

Teratoma is an enemy in The Binding of Isaac: Rebirth that is found as a Boss on the Necropolis and The Womb Floors. It is the posthumous variant of Fistula.


  • Teratoma starts out as a large ball of flesh, bouncing around the room. After it is killed, it will split into three medium balls of flesh that bounce around the room. After one of those is killed, the medium ball of flesh will split into two smaller balls of flesh. Each of those smaller balls of flesh will split into two Spiders.

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