Tumors of the inferior longitudinal muscle of the tongue are abnormal growths—benign or malignant—that arise within the intrinsic muscle fibers located on the underside of the tongue. They can distort tongue shape and movement, causing symptoms like lumps, pain, or difficulty speaking and swallowing.
Anatomy of the Inferior Longitudinal Muscle
A precise grasp of anatomy is vital to understanding how tumors affect tongue function.
Structure & Location
Intrinsic muscle lying entirely within the tongue’s substance
Positioned on the ventral (under) surface, between the genioglossus and hyoglossus muscles
Origin
Arises from the root (base) of the tongue
Insertion
Inserts at the apex (tip) of the tongue
Blood Supply
Supplied by branches of the lingual artery, especially the deep lingual artery, with contributions from dorsal lingual branches kenhub.com
Nerve Supply
Motor innervation via the hypoglossal nerve (cranial nerve XII)
Key Functions
Shortening the tongue, broadening its body
Thickening the tongue by increasing its vertical dimension
Retracting the tongue backward into the mouth
Depressing (lowering) the tongue tip—ventroflexion
Curling the sides of the tongue downward to shape food bolus
Assisting speech and swallowing by fine-tuning tongue posture
Types of Tumors
Tumors are classified by tissue of origin:
Epithelial (Salivary/Surface) Tumors
Squamous cell carcinoma
Adenoid cystic carcinoma
Mucoepidermoid carcinoma
Benign Mesenchymal Tumors
Granular cell tumor
Leiomyoma
Hemangioma & lymphangioma
Schwannoma & neurofibroma
Fibroma & lipoma
Malignant Mesenchymal Tumors
Rhabdomyosarcoma
Leiomyosarcoma
Fibrosarcoma
Angiosarcoma
Neural Tumors
Schwannoma
Neurofibroma
Lymphoid & Hematologic Tumors
Lymphoma
Metastatic Lesions
Melanoma
Carcinomas from distant sites
Causes
(Often called risk factors rather than direct causes.)
Tobacco smoking
Chewing tobacco (snuff)
Heavy alcohol consumption
Combined tobacco–alcohol use
Human papillomavirus (HPV) infection
Chronic mechanical irritation (sharp teeth, dentures)
Poor oral hygiene
Betel quid (areca nut) chewing
Oral submucous fibrosis
Genetic mutations (e.g., p53)
Immunosuppression (HIV/AIDS)
Epstein–Barr virus (lymphoma risk)
Syphilitic lesions
Chronic candidiasis
Oral lichen planus
Nutritional deficiencies (vitamins A, C, E)
Previous radiation to head/neck
Occupational carcinogens (wood dust, nickel)
Dietary nitrosamines
Age over 50 years
Symptoms
Lump or mass under the tongue
Persistent tongue ulcer
Pain or tenderness in the tongue
Bleeding from the tongue
Difficulty swallowing (dysphagia)
Painful swallowing (odynophagia)
Slurred speech (dysarthria)
Change in taste
Numbness of tongue or mouth
Ear pain (referred)
Swelling under the jaw
Halitosis (bad breath)
Weight loss
Excess saliva or drooling
Tongue stiffness or reduced mobility
Difficulty chewing
White or red patches (leukoplakia/erythroplakia)
Neck lymph node enlargement
Sore throat not improving
Foul mouth odor
Diagnostic Tests
Clinical oral examination
Palpation of tongue and floor of mouth
Toluidine blue rinse (lesion highlighting)
Indirect or direct laryngoscopy
Incisional biopsy (sample removal)
Excisional biopsy (entire lesion)
Fine-needle aspiration cytology (FNAC)
Histopathology & immunohistochemistry
HPV-16/18 PCR testing
Contrast-enhanced CT scan of head/neck
MRI for soft-tissue detail
Ultrasound of tongue & neck
PET-CT for metastasis
Chest X-ray (lung metastases)
Complete blood count (CBC)
Liver & kidney function tests
Panendoscopy (esophago-bronchoscopy)
Dental panoramic X-ray
Sentinel lymph node biopsy
Tumor marker studies (e.g., p16)
Non-Pharmacological Treatments
Surgical excision (tumor removal)
Radiation therapy (external beam)
Brachytherapy (internal radiation)
Photodynamic therapy
Laser ablation
Cryotherapy
Hyperbaric oxygen therapy
Speech therapy
Swallowing (dysphagia) therapy
Oral motor exercises
Physical therapy (neck/jaw ROM)
Occupational therapy
Nutritional counseling
Feeding tube placement (PEG)
Prosthetic rehabilitation (palatal ramp)
Dental hygiene optimization
Denture adjustment or new prosthesis
Myofunctional therapy
Low-level laser therapy for pain
Acupuncture for pain & nausea
Massage therapy (neck/shoulder)
Mindfulness & relaxation techniques
Yoga & gentle stretching
Psychological counseling
Support groups & peer support
Smoking cessation programs
Alcohol reduction counseling
Oral hygiene routines (chlorhexidine rinses)
Antioxidant-rich diet coaching
Regular dental & ENT follow-up
Drugs
(Primarily for malignant tumors.)
Cisplatin
Carboplatin
5-Fluorouracil (5-FU)
Methotrexate
Bleomycin
Paclitaxel
Docetaxel
Cyclophosphamide
Doxorubicin
Vincristine
Ifosfamide
Topotecan
Cetuximab (anti-EGFR)
Erlotinib (EGFR TKI)
Gefitinib (EGFR TKI)
Pembrolizumab (anti-PD-1)
Nivolumab (anti-PD-1)
Durvalumab (anti-PD-L1)
Combination TPF (Taxane + Platinum + 5-FU)
Cetuximab + Cisplatin
Surgical Procedures
Incisional biopsy
Excisional biopsy
Partial glossectomy (wedge resection)
Hemiglossectomy
Total glossectomy
Transoral laser microsurgery
Selective neck dissection
Modified radical neck dissection
Microvascular free-flap reconstruction
Pedicled flap reconstruction
Prevention Strategies
Avoid all tobacco products
Limit or eliminate alcohol
Get HPV vaccination
Maintain excellent oral hygiene
Visit dentist regularly
Avoid betel quid/areca nut
Eat a balanced diet rich in fruits & vegetables
Fix sharp teeth or ill-fitting dentures
Use lip balm with SPF for sun protection
Monitor and treat pre-cancerous oral lesions early
When to See a Doctor
Seek medical attention if you have any of these that persist for >2 weeks:
A lump or ulcer on the tongue or floor of mouth
Unexplained pain or bleeding in the mouth
Difficulty or pain when swallowing or speaking
Numbness, earache, or swelling in the neck
Weight loss or loss of appetite
Frequently Asked Questions
What is the inferior longitudinal muscle?
A thin intrinsic muscle under the tongue that shapes and moves its tip.What causes tumors here?
Mostly risk factors like tobacco, alcohol, HPV, and chronic irritation.How common are these tumors?
Rare compared with other tongue cancers, but still important to check.What are early warning signs?
Lumps, ulcers, pain, bleeding, or persistent changes in tongue appearance.How are they diagnosed?
Through clinical exam, imaging (MRI/CT), and biopsy with lab tests.Is biopsy painful?
Local anesthesia is used; you may feel pressure but minimal pain.What treatment options exist?
Surgery, radiation, chemotherapy, plus supportive therapies.Can speech return to normal?
Often yes, with speech therapy and appropriate reconstruction.Are non-drug therapies effective?
Yes—radiation, laser, photodynamic therapy, plus rehab support.What are common chemotherapy drugs?
Cisplatin, 5-FU, taxanes, and newer immunotherapies (e.g., pembrolizumab).What surgical choices are there?
From small wedge resections to partial or total glossectomy with reconstruction.Can I prevent these tumors?
Yes—by avoiding tobacco/alcohol, maintaining oral health, and getting HPV vaccine.How is prognosis?
Varies by tumor type and stage; early detection offers best outcomes.Do these tumors spread?
Malignant types can spread locally or to lymph nodes and distant sites.When is follow-up needed?
Regular check-ups every 3–6 months for 2 years, then annually.
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The article is written by Team Rxharun and reviewed by the Rx Editorial Board Members
Last Updated: April 23, 2025.
