Hypogammaglobulinemia factitia- Munchausen syndrome masquerading as common variable immune deficiency.

Background: We describe the first case of a patient with factitious disorder who closely simulated a primary immune deficiency disorder - Common Variable Immune Deficiency (CVID), by surreptitiously ingesting non-steroidal anti-inflammatory agents.

Case Description: He was treated with several expensive and potentially dangerous drugs before the diagnosis was established through collateral information. In retrospect he did not meet the proposed new criteria for CVID. These criteria may prove useful in distinguishing cases of CVID from secondary hypogammaglobulinemia.

Conclusion: It is imperative clinicians recognise patients with factitious disorder at the earliest opportunity to prevent iatrogenic morbidity and mortality.