Familial Cold Autoinflammatory Syndrome
NORD gratefully acknowledges Dr. Hal Hoffman, Associate Professor of Pediatrics and Medicine, Division of Rheumatology, Allergy, and Immunology at the University of California at San Diego School of Medicine, for assistance in the preparation of this report.
Synonyms of Familial Cold Autoinflammatory Syndrome
- familial cold urticaria
Familial cold autoinflammatory syndrome (FCAS), also known as familial cold urticaria, is a rare, inherited inflammatory disorder characterized by intermittent episodes of rash, fever, joint pain and other signs/symptoms of systemic inflammation triggered by exposure to cold. Onset of FCAS occurs during infancy and early childhood and persists throughout the patient's life.
FCAS is one of the cryopyrin associated periodic syndromes (CAPS) caused by mutations in the CIAS1/NLRP3 gene. These syndromes are characterized by fever, rash, and joint pain. As in other CAPS, amyloidosis can rarely develop later in life in FCAS patients. Amyloidosis is due to an abnormal accumulation of the protein amyloid in a patient's tissues and organs such as the kidneys where it results in damage and often kidney failure if untreated.
FCAS shares symptoms, and should not be confused, with acquired cold urticaria, a more common condition mediated by different mechanisms that usually develops later in life and is rarely inherited.
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