What are the main diagnostic methods for nasal and paranasal sinus cancer?

The diagnosis of nasal and paranasal sinus cancer relies on a series of sequential procedures that doctors initiate to rule out benign conditions and confirm the nature of any abnormal growth. Because the initial symptoms of this type of cancer, such as persistent sinus congestion or nosebleeds, are often similar to common respiratory issues, an accurate diagnosis requires a comprehensive approach starting with clinical assessment and ending with histological examination [1].

Clinical Examination and Initial Assessment

The diagnostic journey begins with a visit to a specialist for a thorough clinical examination. The doctor examines the face, nose, and neck for any abnormal lumps or swollen lymph nodes. They also use a tool called a nasoscope—a thin, lighted tube with a lens—to look directly inside the nasal cavity and sinuses [1]. This examination is essential for identifying suspicious areas or changes in the nasal lining. During this stage, the doctor reviews the patient’s personal and family health history, which is a vital part of the process for assessing risk factors, such as occupational exposure to certain chemicals or smoking [1].

Advanced Imaging

Imaging is not considered a definitive diagnostic tool for cancer on its own, but it is an indispensable tool for determining the tumor's location and extent of spread. A computed tomography (CT) scan is used to provide detailed images of tissues and bones from multiple angles, helping doctors visualize bone changes resulting from the tumor [1]. Magnetic resonance imaging (MRI) provides detailed images of the body's internal areas using magnets, radio waves, and a computer [1]. These images help doctors precisely plan any upcoming surgical procedures.

Biopsy: The Decisive Confirmation Method

A biopsy remains the only way to confirm a diagnosis definitively. During the endoscopy procedure, the doctor may take a tissue sample of the abnormal area (a biopsy) to send to a laboratory, where a pathologist examines the cells under a microscope [1]. This examination determines the exact type of cancer cells, whether they are squamous cell carcinoma (the most common type) or rarer types such as adenocarcinomas or sarcomas [4]. Without histological analysis, a personalized treatment plan cannot be initiated, as treatment is designed based on the specific characteristics of these cells.

Staging

Once cancer is confirmed via biopsy, doctors begin a process called "staging." Here, additional tests are used, such as a positron emission tomography (PET) scan or a bone scan, to check if the cells have spread to other parts of the body, such as lymph nodes in the neck or distant organs [1]. Continuous follow-up with a specialized medical team is crucial, as cancers in this region require meticulous care. For more details on managing these cases, you can review our guide on Nasal and Paranasal Sinus Cancer: Early Detection and Advanced Treatments (Arabic).

It should be noted that early diagnosis significantly increases the chances of successful treatment. Therefore, any persistent symptoms such as unexplained facial pain or sudden vision loss require immediate consultation with a specialist. Diagnosis does not rely on a single test but on the integration of clinical, imaging, and laboratory results to ensure accuracy and avoid delays in therapeutic intervention.

Medical references

• Paranasal Sinus and Nasal Cavity Cancer Treatment - NCI
• Nasal and paranasal sinus cancer | Cancer Research UK