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Background: The association between KFD and autoimmune diseases, not only with systemic lupus erythematosus, has been repeatedly described. Objective: The aim of this review is to evaluate whether an overlap syndrome is present between KFD and autoimmune diseases, whether there is a chronological and a casual relationship between the pathologies. Methods: The databases used for the overlap case search were Medline and Embase from which we extrapolated the studies of interest. The search queries used were: Kikuchi-Fujimoto Syndrome and juvenile idiopathic arthritis or systemic lupus erythematosus or Systemic Sclerosis or Antiphospholipid Syndrome or Sjogren's Syndrome. All study types were considered (n=103). Results: total number of included studies are 43. We have shown that there is an "overlap" syndrome between KFD and other autoimmune diseases. The chronology of disease onset was variable; autoimmune disease may be "preceding" (n.=11 cases) or "simultaneous" (n.=20 cases) or "post" (n.=8 cases). Kikuchi-Fujimoto Syndrome. Also, the autoimmune disease can present with a complete clinical picture or only with the presence of autoantibodies. Conclusion: the different pathologies associated with KFD with different chronologies would indicate suggest that there is an alteration of the immune system that allows the autoimmune phenomena pathologies to occur in different temporal relationships.

The most common cause of neck infections is odontogenic abscesses that can often be life-threatening and require a surgical drain associated with antibiotic therapy. We present a case of the surgical management of an odontogenic sack-shaped and walled abscess arising from elements 3.6, 3.7 and 3.8 that reached the laterocervical spaces and anterior mediastinum in a 28-year-old healthy woman. Typical signs and symptoms of cervical complications of dental origin are fever, a neck mass, lymphadenopathy, trismus and odynophagia. The gold standard treatment in these situations is a multidisciplinary approach involving an oral surgeon, ENT specialist and thoracic surgeon to drain the infected material. To the best of our knowledge, this is the first described case report of a dental abscess enclosed in a sack in the deep space of the neck and in the anterior space of the mediastinum.

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