22. After Hours

When House discovers that the experimental drug he has been using causes fatal tumors, he decides to excise them himself. He attempts to do it in his bathtub but fails and calls around for help, with Cuddy being the only one to respond. Meanwhile, Thirteen's friend from prison ( Amy Landecker ), a relapsed drug user, arrives at her apartment needing medical care after being stabbed. With her friend unwilling to go to the hospital, Thirteen finds herself in trouble when the friend loses sensation and movement in her arm. Chase helps her out, brushing Thirteen's ego aside. Taub receives some unexpected news that could change his life. Final Diagnosis: Entamoeba microbial cyst (referred to as an Amoebic parasitoma)