Oncology · Head and Neck Cancer
The facts most likely to be tested
Nasopharyngeal carcinoma is strongly associated with chronic Epstein-Barr virus (EBV) infection.
The disease exhibits a distinct geographic predilection for individuals of Southern Chinese or Southeast Asian descent.
Patients frequently present with cervical lymphadenopathy due to early lymphatic spread to the posterior triangle of the neck.
Unilateral serous otitis media in an adult is a classic clinical presentation caused by eustachian tube obstruction from a nasopharyngeal mass.
Physical examination often reveals a mass in the fossa of Rosenmüller, the most common site of origin.
Cranial nerve palsies, particularly involving CN VI (abducens nerve), occur due to tumor extension into the cavernous sinus or skull base.
The primary treatment modality for nasopharyngeal carcinoma is radiation therapy combined with concurrent chemotherapy.
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A 45-year-old male of Cantonese descent presents to the clinic complaining of a 3-month history of a persistent blocked sensation in his left ear and a painless neck mass. Physical examination reveals unilateral serous otitis media on the left and a firm, non-tender cervical lymph node in the posterior triangle. Nasopharyngoscopy demonstrates a friable, exophytic mass located in the fossa of Rosenmüller. The patient denies tobacco or alcohol use.
What is the most likely diagnosis?
Nasopharyngeal carcinoma
The patient's demographic, unilateral ear symptoms (eustachian tube obstruction), and posterior cervical lymphadenopathy are classic for nasopharyngeal carcinoma, which is strongly linked to EBV.
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Etiology / Epidemiology
Strongly associated with Epstein-Barr virus (EBV) infection and dietary nitrosamines (salted fish).
Clinical Manifestations
Presents with cervical lymphadenopathy and nasopharyngeal mass; often causes eustachian tube dysfunction (unilateral otitis media).
Diagnosis
Diagnosis confirmed via nasopharyngoscopy with biopsy; MRI is the gold standard for staging.
Treatment
Primary treatment is radiation therapy; chemotherapy is added for advanced stages.
Prognosis
High cure rate in early stages; cranial nerve palsies indicate advanced local invasion.
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Epidemiology & Etiology
Most common in patients of Southern Chinese or Southeast Asian descent. Strongly linked to EBV genome integration within malignant cells. High consumption of preserved/salted fish containing volatile nitrosamines is a major environmental risk factor.
Pertinent Anatomy
The nasopharynx is located at the base of the skull, posterior to the nasal cavity. Tumors frequently arise in the fossa of Rosenmüller, which explains early obstruction of the eustachian tube.
Pathophysiology
Malignant transformation is driven by the interaction of genetic susceptibility, environmental factors, and EBV infection. The tumor is typically a non-keratinizing squamous cell carcinoma. Rapid local growth leads to invasion of the skull base and intracranial extension.
Clinical Manifestations
Patients often present with a painless neck mass (cervical lymphadenopathy) as the initial symptom. Unilateral serous otitis media or nasal obstruction is highly suspicious. Cranial nerve palsies (specifically CN V and VI) suggest advanced skull base invasion.
Diagnosis
Direct visualization via nasopharyngoscopy is required to identify the lesion. Biopsy is the definitive diagnostic test. MRI of the head and neck is the gold standard for evaluating the extent of local invasion and nodal involvement.
Treatment
The primary modality is radiation therapy due to the high radiosensitivity of these tumors. Concurrent cisplatin-based chemotherapy is indicated for stage II-IV disease. Avoid surgery as the primary treatment due to the complex anatomy of the skull base.
Prognosis
Early-stage disease has a favorable prognosis with 5-year survival rates exceeding 80%. Long-term monitoring is required to detect local recurrence or distant metastasis to bone, lung, or liver.
Differential Diagnosis
Lymphoma: typically presents with systemic B-symptoms
Tonsillar carcinoma: usually involves the oropharynx rather than the nasopharynx
Juvenile angiofibroma: presents with recurrent epistaxis in adolescent males
Salivary gland tumors: usually present as a parotid or submandibular mass
Tuberculosis: consider in patients with chronic lymphadenopathy and constitutional symptoms