Non-canonical manifestations of familial Mediterranean fever: a changing paradigm

Area of Science:

• Genetics and Immunology
• Rheumatology
• Internal Medicine

Background:

• Familial Mediterranean fever (FMF) is the prototype inherited systemic autoinflammatory disease.
• It is characterized by recurrent, self-limited inflammatory episodes affecting the abdomen, chest, or joints.
• Non-classical FMF manifestations include vasculitis, thrombotic events, neurological issues, and macrophage activation syndrome.

Purpose of the Study:

• To highlight the diverse clinical spectrum of Familial Mediterranean Fever.
• To emphasize the importance of recognizing non-classical presentations of FMF.
• To underscore the necessity of early diagnosis and treatment to prevent AA-amyloidosis.

Main Methods:

• Review of clinical manifestations and literature on FMF.
• Analysis of reported non-classical FMF cases.
• Discussion of diagnostic challenges and therapeutic implications.

Main Results:

• FMF presents with a wide range of symptoms, including typical inflammatory crises and less common findings like erysipelas-like erythema, orchitis, myalgia, vasculitis, thrombotic events, and neurological abnormalities.
• Untreated FMF carries a significant risk of developing AA-amyloidosis, a severe complication.
• Diagnosis of FMF should be considered across all ages, irrespective of symptom presentation.

Conclusions:

• Familial Mediterranean Fever exhibits a broad clinical variability, necessitating a high index of suspicion for diagnosis.
• Prompt recognition and management of FMF are essential to mitigate the risk of debilitating AA-amyloidosis.
• Awareness of both classical and non-classical FMF phenotypes is critical for effective patient care.