Case Study: Immunology of Complement Deficiency Disorder and Analysis

This document presents a case study focusing on a 17-year-old patient, Angel, who presented with painless swelling in her left hand, later complicated by abdominal pain, anorexia, and vomiting. The case highlights the challenges in diagnosing complement deficiency disorders, specifically addressing the role of C1 esterase inhibitor deficiency and its link to Hereditary Angioedema (HAE). The study explains the complement system, its proteins, and deficiencies leading to serious bacterial infections and autoimmune diseases. It delves into the clinical manifestations, including angioedema and gastrointestinal symptoms, and discusses the diagnostic approaches, particularly the significance of C1 esterase inhibitor levels. The references provide a foundation for understanding the disorder and its management.