Familial Mediterranean fever (FMF) is a hereditary inflammatory disorder that affects groups of patients originating from around the Mediterranean Sea (hence its name). It is prominently present in the Armenian people (up to 1 in 7 affected), Sephardi Jews (and, to a much lesser extent, Ashkenazi Jews), people from Turkey, the Arab countries and Lebanon.Livneh A, Langevitz P. Diagnostic and treatment concerns in familial Mediterranean fever. Baillieres Best Pract Res Clin Rheumatol 2000;14(3):477-98. PMID 10985982.

Clinical symptoms

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Attacks

There are seven types of attacks. 90% of all patients have their first attack before they are 20 years old. All develop over 2-4 hours and last anytime between 6 hours and 4 days. Most attacks involve fever:

1. Abdominal attacks, featuring abdominal pain affecting the whole abdomen with all signs of acute abdomen (e.g. appendicitis). They occur in 95% of all patients and may lead to unnecessary laparotomy. Incomplete attacks, with local tenderness and normal blood tests, have been reported.
2. Joint attacks, occurring in large joints, mainly of the legs. Usually, only one joint is affected. 75% of all FMF patients experience joint attacks.
3. Chest attacks with pleuritis (inflammation of the pleural lining) and pericarditis (inflammation of the pericardium). Pleuritis occurs in 40%, but pericarditis is rare.
4. Scrotal attacks due to inflammation of the tunica vaginalis. This occurs in up to 5% and may be mistaken for acute scrotum (i.e. testicular torsion)
5. Myalgia (rare in isolation)
6. Erysipeloid (a skin reaction on the legs, rare in isolation)
7. Fever without any symptoms (25%)

Complications

AA-amyloidosis with renal failure is a complication and may develop without overt crises. AA (amyloid protein) is produced in very large quantities during attacks and at a low rate between them, and accumulates mainly in the kidney, as well as the heart, spleen, gastrointestinal tract and the thyroid.

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