Cervical lymphadenopathy refers to the abnormal enlargement of lymph nodes located in the cervical region and is frequently associated with a wide range of pathological conditions, including infectious, inflammatory, autoimmune, and neoplastic processes. Among the infectious causes, odontogenic infections represent a significant contributor, particularly in populations with limited access to dental care or poor oral hygiene, & other causes are bacterial, viral, fungal,mycobacterial, parasitic.

Dental pathologies such as dental caries, periodontitis, periapical abscesses, and acute or chronic oral infections can lead to the translocation of bacteria and other pathogens into the periapical and periodontal tissues. From these sites, microorganisms—most commonly aerobic and anaerobic bacteria, including Streptococcus and Fusobacterium species—may invade the surrounding vasculature and lymphatic drainage pathways. Cervical lymph nodes serve as critical immunological checkpoints, responsible for filtering lymphatic fluid and initiating immune responses against microbial antigens . The invasion stimulates a local immune response characterized by the activation of resident macrophages and dendritic cells, followed by the recruitment of lymphocytes and neutrophils, culminating in lymph node enlargement.

The enlargement of these nodes in response to dental infections typically reflects reactive hyperplasia, a benign but clinically significant manifestation of heightened immune activity. In some cases, especially in immunocompromised individuals or in the setting of untreated or severe dental infections, lymphadenitis may progress to suppuration or abscess formation.

Diagnosis relies on a comprehensive clinical assessment, including dental examination, history of recent oral infections, and, when indicated, imaging studies such as ultrasonography or contrastenhanced CT. In ambiguous cases or when malignancy cannot be excluded, fine-needle aspiration cytology (FNAC) or lymph node biopsy may be warranted.

Early recognition of the dental origin of cervical lymphadenopathy is crucial for targeted intervention. Management typically involves addressing the underlying dental infection through appropriate antimicrobial therapy, drainage of abscesses, or definitive dental procedures such as root canal treatment or extraction. Failure to treat the primary source may result in persistent lymphadenopathy, systemic spread, or complications such as deep neck space infections, Ludwig angina.

Patients presenting with cervical lymphadenopathy due to dental infections often exhibit localized clinical signs, such as pain, tenderness, warmth, and swelling over the affected lymph nodes. These manifestations may be accompanied by trismus, odynophagia, or intraoral swelling, depending on the extent and location of the dental pathology. In many cases, systemic signs of infection—including fever, chills, malaise, and elevated inflammatory markers—may also be present, particularly in moderate to severe infections.

There are no proper written guidelines for the evaluation of cervical lymphadenopathy in a case of dental caries.

METHODOLOGY

Study Design

This was a prospective observational study conducted to evaluate the association between dental infections and cervical lymphadenopathy.

Study Population

The study included patients who presented with cervical lymphadenopathy and received treatment at the Department of Otorhinolaryngology (ENT) in a tertiary care hospital.

Study Duration

The study was conducted over a period of one year.

Inclusion Criteria

• Cases diagnosed with cervical lymphadenopathy.
• Presence of dental caries confirmed on clinical or radiological evaluation.
• Cases with dental caries and associated comorbidities (e.g., diabetes mellitus).
• Cases who are willing to participate in the study and given written consent.

Exclusion Criteria

• Cases presenting with cervical lymphadenopathy without evidence of dental caries
• Cervical lymphadenopathy due to TB, Non odentogenic and Malignancy
• Cases who not given consent.

MATERIALS AND METHODS

All patients underwent a thorough history and clinical examination, followed by appropriate diagnostic investigations, including:

• Routine blood investigations like Complete blood count, coagulation profile
• Ultrasonography (USG) of the neck to assess lymph node characteristics
• Orthopantomogram (OPG) X-ray to identify and evaluate dental caries and periapical pathology.
• Fine Needle Aspiration Cytology (FNAC) for cytological evaluation of enlarged lymph nodes.
• Management: Broad spectrum (specific) antibiotics, incision drainage, tooth extraction and where oral intake is compromised due to trismus or odynophagia, nutritional support through Ryle’s tube feeding whenever necessary.
• Ethical Considerations: All patients provided informed consent to participate in the study and used their clinical data and images. The study was conducted using ethical guidelines and approved by institutional review board of Gauhati Medical College and Hospital .

RESULT

The distribution of cases across different age groups revealed that the majority of patients were aged over 41 years, accounting for 44 cases. This was followed by 24 patients in the 31–40 year age group and 20 patients in the 21–30 year group. The number of cases was comparatively lower among younger individuals, with 7 cases in the 11–20 year group and 5 cases in the 1–10 year group. Out of the total study population, 68 patients (68%) were male and 32 patients (32%) were female, indicating a male predominance in the occurrence of cervical lymphadenopathy associated with dental infections.

A review of hospitalization data revealed that male patients with co-morbidities (n = 28) tended to have longer hospital stays, typically lasting more than 3 to 4 weeks. In contrast, male patients without co-morbidities (n = 40) generally experienced shorter hospital stays, lasting less than 3 weeks.

Similarly, among female patients, those with co-morbidities (n = 13) were hospitalized for more than 3 to 4 weeks, while female patients without co-morbidities (n = 19) had shorter hospital stays of less than 3 weeks.

A total of 100 samples were analyzed for microbial growth. Staphylococcus was the most frequently isolated organism, detected in 24 cases (24%). Streptococcus was identified in 14 cases, accounting for 14% of the total. Candidiasis was found in 2 cases (2%), while E. coli was present in only 1 case (1%). Pseudomonas was not detected in any of the samples (0%). Notably, no microbial growth was observed in 59 of the samples, representing the highest proportion at 59%.

Ultrasonographic evaluation of the 100 patients revealed that 70% had cervical lymphadenopathy involving the submandibular lymph nodes. Of these, 45 cases presented with swelling on the right side, and 25 cases on the left side. The long-axis diameter of the lymph nodes varied, with 22 cases measuring 1–3 mm, 68 cases measuring 3–6 mm, and 10 cases exceeding 6 mm in size.

The remaining 30 cases showed involvement of the submental lymph nodes.

Clinically, the majority of patients exhibited submandibular lymph node enlargement, which was characteristically tender, firm, non-adherent to overlying skin, and had regular margins— features consistent with reactive inflammatory lymphadenopathy.

Table 1 showing the distribution of case as per demographic, hospitalisation, microbial finding and USG Finding.

Table 1 : Summary of Demographic, Clinical, Microbiological, and Ultrasonographic Findings (n = 100)

Case 1 (A) : Clinical photograph of a 38-year-old female presenting with a painless right-sided cervical swelling of six days' duration. The patient had a known history of type 2 diabetes mellitus. Oral examination and orthopantomogram (OPG) imaging revealed dental caries involving the lower right first and second molars (teeth 30 and 31). Following extraction of the affected teeth under appropriate antibiotic coverage and glycemic control, the cervical swelling resolved over three weeks. Figure 1 (a-c)

Case 1 (B) : A 36-year-old male with a history of type 2 diabetes mellitus presented with a painful swelling in the right parotid region of 15 days' duration. Clinical examination revealed dental caries involving the lower right second molar (tooth 31). Ultrasonography confirmed a right-sided parotid abscess. Under adequate antibiotic coverage and glycemic control, surgical drainage of the abscess and extraction of the involved tooth were performed. The swelling resolved fully within four weeks. Figure 1 (d & e).

Case 2 (A):  A 9-year-old female presented with a painful swelling on the left side of the neck, persisting for seven days. Oral examination revealed dental caries involving the lower left second premolar (tooth 29). The swelling progressed to a localized abscess. Management included empirical broad-spectrum antibiotic therapy, surgical drainage of the abscess, and extraction of the affected tooth. The intervention led to clinical resolution. Figure 2 (a & b).

Case 2(B) : A 37-year-old male with type 2 diabetes mellitus presented with a painful, inflamed ulcer on the left side of the neck for 14 days. Dental examination revealed caries in the lower third molars, which had led to the development of a neck abscess. Management included drainage of the abscess, extraction of the affected teeth, and stabilization of blood glucose levels. The patient responded well to the treatment. Figure 2 (c & d)

Case 3 A   : A 36-year-old female presented with an 8-day history of painful swelling on the left side of the neck. Oral examination revealed dental caries involving the left lower second premolar. Despite initial management with appropriate antibiotic coverage, the swelling progressed to abscess formation within 4–5 days. Definitive treatment included extraction of tooth along with surgical incision and drainage of the abscess, leading to gradual clinical improvement. Figure  3 ( a & b )

Case 3 B : An 18-year-old female presented with a painful swelling of floor of the mouth and neck, persisting for 10 days. Clinical examination identified dental caries involving the right lower second molar. Despite initiation of appropriate antibiotic therapy, the lesion progressed to abscess formation within 4–5 days. The patient subsequently underwent extraction of the affected tooth, followed by surgical incision and drainage of the abscess under antibiotic coverage. The intervention led to a gradual resolution of the swelling. Figure 3 (d & e)

Figure 3 showing Case 3 A & B

DISCUSSION

Cervical lymphadenopathy is a common clinical finding with a broad differential diagnosis. Among the many causes, dental infections represent a prevalent and clinically significant etiology, particularly when lymph node enlargement is localized, tender, and associated with oral signs or symptoms. Increased awareness among dental and medical professionals is essential to ensure timely diagnosis, appropriate referral, and effective treatment of these cases.

Painful cervical swelling is frequently encountered in association with dental caries. Accurate diagnosis begins with a detailed clinical history, focusing on the location, duration, progression, and accompanying symptoms of the lesion. This approach is essential to distinguish odontogenic causes from other potential etiologies of cervical lymphadenopathy.

In this study, 41% of patients had coexisting type 2 diabetes mellitus—an established comorbidity that compromises immune function and delays healing. These patients experienced prolonged hospitalizations (>3 weeks) and required endocrinology consultation for glycemic control using insulin or oral hypoglycemic agents (OHAs). Conversely, 59% of patients without comorbidities had hospital stays of less than three weeks, suggesting a more favorable prognosis. Advanced age (>50 years) was also associated with longer recovery times and extended hospital stays, underscoring the influence of systemic health and age on treatment outcomes and disease progression.

All patients received standardized clinical evaluations, including imaging and laboratory investigations. Empirical broad-spectrum antibiotics were administered initially, and in cases of purulent discharge, samples were collected for culture and sensitivity. Antibiotic therapy was adjusted accordingly based on microbiological findings to ensure targeted, effective management.

Microbiological analysis revealed Staphylococcus and Streptococcus species as the most frequently isolated organisms—both consistent with the typical oral flora in dental infections. Escherichia coli was found in one case, and Candida species in two cases, suggesting possible opportunistic infections. A significant number of cultures showed no microbial growth, likely due to prior empirical antibiotic use at peripheral health centers before referral.

In a number of neglected cases, patients presented with trismus and dysphagia, alongside extensive skin ulceration complicated by myiasis and anemia. While most patients responded well to appropriate medical and surgical management, one case resulted in mortality despite comprehensive intervention.

All patients were found to have underlying dental caries, warranting timely dental consultation and intervention. Management strategies included broad spectrum antibiotics, incision & drainage, extraction of the affected teeth, Ryle’s tube feeding for nutritional support and also split-thickness skin grafting for patients presenting with extensive neck ulcers. These multidisciplinary interventions led to significant clinical improvement, with resolution of cervical lymphadenopathy observed in most cases, underscoring the critical role of integrated dental and medical care.

Complications and Public Health Implications

Cervical lymphadenopathy of odontogenic origin remains under-recognized, despite its potential to cause severe complications. If untreated, such infections can extend beyond local tissues, invading deep fascial spaces of the neck and leading to conditions like submandibular or sublingual space infections, cervical cellulitis with skin ulcers, or suppurative lymphadenitis. A particularly serious consequence is Ludwig’s angina—a bilateral, rapidly progressing infection of the submandibular space that can lead to airway compromise.

In immunocompromised individuals or in cases of delayed treatment, the risk of systemic spread increases, potentially resulting in sepsis, mediastinitis, or intracranial infections via venous pathways such as the facial and pterygoid plexuses. Early diagnosis and appropriate intervention are therefore critical to avoid life-threatening complications.

Despite the clinical relevance, literature on the specific relationship between dental infections and cervical lymphadenopathy remains limited. More epidemiological and microbiological studies are needed to expand our understanding of this association and to guide optimized treatment strategies. Comparative studies from the previous studies were given below in table 2

Table 2: Comparative Analysis of Cervical Lymphadenopathy Studies Conclusion

Cervical lymphadenopathy of odontogenic origin remains a clinically important yet frequently overlooked diagnosis. The findings from this study highlight dental caries as a prominent underlying cause, especially in individuals with systemic conditions such as type 2 diabetes mellitus. Timely recognition, coordination between dental and medical disciplines, and the use of appropriate antibiotic regimens are critical for effective management. The microbiological analysis most commonly revealed the presence of Streptococcus and Staphylococcus species; however, a notable number of negative cultures may be attributed to prior empirical antibiotic use before presentation. Collaborative care involving dental professionals and medical specialists, including endocrinologists when needed, contributed significantly to improved clinical outcomes and reduced hospitalization durations.

This study provides valuable insight into the evaluation and management of cervical lymphadenopathy of odontogenic origin. A thorough clinical examination should include inspection of all visible mucosal surfaces, accompanied by careful palpation of the floor of the mouth, tongue, retromolar trigone, and cervical region.

 It is essential for oral and maxillofacial surgery (OMFS) professionals to possess comprehensive knowledge of the potential for odontogenic causes of cervical lymphadenopathy to ensure early and appropriate referral.

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