Median rhomboid glossitis
|Median rhomboid glossitis|
Median rhomboid glossitis - asymptomatic erythematous patch of atrophic mucosa with depapillation in the mid dorsal surface of the tongue.
|Classification and external resources|
Median rhomboid glossitis (MRG, also known as central papillary atrophy, or glossal central papillary atrophy. ) is a condition characterized by an area of redness and loss of lingual papillae, situated on the dorsum of the tongue in the midline immediately in front of the circumvallate papillae.:803 Median rhomboid glossitis is thought to be created by a chronic fungal infection, and usually is a type of oral candidiasis.
SITE: the lesion is located immediately anterior to the foramen cecum and circumvallate papillae in the midline on the dorsum of the tongue.
Signs and symptoms
Rarely is any soreness associated with the condition. Apart from the appearance of the lesion, there are usually no other signs or symptoms. The typical appearance of the lesion is an oval or rhomboid shaped area located in the midline of the dorsal surface of the tongue, just anterior (in front) of the sulcus terminalis. The lesion is usually symmetric, well demarcated, erythematous and depapillated, which has a smooth, shiny surface. Less typically, the lesion may be hyperplastic or lobulated and exophytic. There may be candidal lesions at other sites in the mouth, which may lead to a diagnosis of chronic multifocal oral candidiasis. Sometimes an approximating erythematous lesion is present on the palate as tongue touches the palate frequently. (a "kissing lesion") do not confuse it with kissing disease( infectious mononucleosis). The lesion is typically 2 – 3 cm in its longest dimension.
Predisposing factors include smoking, denture wearing, use of corticosteroid sprays or inhalers and human immunodeficiency virus (HIV) infection. Candida species even in healthy people mainly colonizes the posterior dorsal tongue. Median rhombiod glossitis is thought to be a type of chronic atrophic (or erythematous) candidiasis. Microbiological culture of the lesion usually shows Candida mixed with bacteria. ETIOPATHOGENESIS: Embryologically the tongue is formed by 2 lateral processes(lingual tubercles)meeting in the midline and fusing above the central structure from its 1st and 2nd branchial arches, the tuberculum impar.The posterior dorsal point is occasionally defective leaving a rhomboid-shaped, smooth , erythematous mucosa lacking in papillae.
The diagnosis is usually made on the clinical appearance, and tissue biopsy is not usually needed. The histologic picture is one of superficial candidal hyphal infiltration and a polymorphonuclear leukocytic inflammatory infiltrate present in the epithelium. The rete ridges are elongated and hyperplastic (pseudoepitheliomatous hyperplasia, which may be mistaken for carcinoma).
Treatment and prognosis
Treatment may involve smoking cessation and prescription of topical or systemic antifungal medication. Usually the mucosal changes resolve with antifungal therapy, but sometimes the lesion is resistant to complete resolution.
It is uncommon condition, occurring with equal prevalence in males and females and at any age.
Historically, this lesion was believed to be a developmental defect of the tongue, caused by failure of the tuberculum impar to be covered by the lateral processes of the tongue. This was disproved when a study of 10,000 children were examined and no medium rhomboid glossitis lesions were found at all. Since, a consistent correlation with C. albicans has been demonstrated.
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