House's Christmas episode forces two crises in parallel: the team works a case involving a fifteen-year-old girl whose collapsed lung and organ failures are misattributed to dwarfism she may not actually have, while House endures Vicodin withdrawal after Cuddy and Wilson cut off his supply to pressure him into a plea deal with Detective Tritter. House diagnoses through self-harm and stolen oxycodone, ultimately identifying Langerhans cell histiocytosis — a condition hiding as both cancer and autoimmune disease — only after a cafeteria encounter with a child prompts him to question the team's core assumption about the patient.

The episode is the pivot point of the Tritter arc. Wilson's attempt to protect House by refusing to testify buys nothing; House's Christmas Eve relapse with a forged prescription gives Tritter independent evidence, mak ...