Lingual Tonsil – Function, Inflammation and Treatment
The lingual tonsil is lymphatic tissue located at the base of the tongue. It forms part of the immune system and can become inflamed, causing throat and swallowing problems.
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The lingual tonsil is lymphatic tissue located at the base of the tongue. It forms part of the immune system and can become inflamed, causing throat and swallowing problems.
What Is the Lingual Tonsil?
The lingual tonsil (Latin: Tonsilla lingualis) is a collection of lymphatic tissue situated at the base of the tongue, near the entrance to the throat. It is part of the so-called Waldeyer's tonsillar ring – a circular arrangement of lymphatic tissue in the mouth and throat that acts as the body's first line of immune defense against pathogens.
Unlike the more commonly known palatine tonsils (commonly called tonsils), the lingual tonsil is less prominent, but it can cause significant symptoms when inflamed or enlarged.
Anatomy and Function
The lingual tonsil consists of numerous lymphoid follicles embedded in the mucous membrane of the tongue base. These follicles produce immune cells, particularly lymphocytes, which identify and combat invading viruses and bacteria.
- Part of Waldeyer's tonsillar ring
- Defense against pathogens in the upper airway
- Production of antibodies and immune cells
- Involvement in adaptive immune responses
Conditions Affecting the Lingual Tonsil
Inflammation (Lingual Tonsillitis)
Inflammation of the lingual tonsil (lingual tonsillitis) can occur acutely or chronically. Common triggers include viral infections (e.g., adenoviruses, Epstein-Barr virus) or bacterial infections (e.g., streptococci). Typical symptoms include:
- Sore throat, especially when swallowing
- Sensation of a foreign body in the throat
- Hoarseness or changes in voice quality
- Bad breath (halitosis)
- Fever, particularly with bacterial infections
- Pain that may radiate to the ear
Enlargement (Hypertrophy)
Enlargement of the lingual tonsil can occur chronically due to recurring infections, hormonal changes, or gastroesophageal reflux. A hypertrophic lingual tonsil may lead to:
- Sleep-related breathing disorders, including obstructive sleep apnea
- Snoring
- Difficulty swallowing (dysphagia)
- A sensation of a lump in the throat (globus sensation)
Benign and Malignant Changes
In rare cases, benign or malignant tissue changes can occur at the lingual tonsil. Squamous cell carcinomas of the tongue base are a serious but uncommon condition, often associated with HPV infection (human papillomavirus). Persistent or unexplained symptoms should always be evaluated by a physician.
Diagnosis
Conditions affecting the lingual tonsil are typically diagnosed by an ear, nose, and throat (ENT) specialist using the following methods:
- Mirror examination of the throat (laryngoscopy)
- Flexible nasopharyngoscopy: assessment using a flexible endoscope
- Imaging studies: ultrasound, MRI, or CT scan when enlargement or tumor is suspected
- Throat swab and laboratory testing: to identify bacterial pathogens
- Biopsy: tissue sampling when malignancy is suspected
Treatment
Conservative Treatment
For acute inflammation of the lingual tonsil, conservative measures are the first line of treatment:
- Antibiotics for confirmed bacterial infections (e.g., penicillin for streptococcal infections)
- Pain-relieving and anti-inflammatory medications (e.g., ibuprofen, paracetamol)
- Antiseptic gargles and throat lozenges
- Adequate fluid intake and rest
Surgical Treatment
In cases of chronic enlargement causing significant symptoms or sleep-related breathing disorders, surgical reduction or removal of the lingual tonsil may be necessary. Modern techniques include:
- Radiofrequency ablation: tissue reduction using high-frequency energy
- Laser surgery: targeted reduction using laser technology
- Coblation: a gentle technique for tissue reduction
- Conventional surgical resection for malignant findings
References
- Cummings C.W. et al. – Cummings Otolaryngology: Head and Neck Surgery. 7th Edition, Elsevier, 2021.
- Schilder A.G.M. et al. – Otitis media. Nature Reviews Disease Primers, 2016. PubMed PMID: 27170044.
- World Health Organization (WHO) – Head and Neck Tumours. WHO Classification of Tumours, 4th Edition, IARC Press, 2017.
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