Monophasic Synovial Sarcoma of the Posterior Pharyngeal Wall: A Rare Case Study

Content Warning:
This article references a published medical case study that includes graphic surgical images involving the head and neck region. While the information may be valuable and informative, some readers may find the images difficult to view. Please proceed with care.

Synovial sarcoma most often develops in the extremities, but in rare cases, it can arise in the head and neck region. A published case study in the European Archives of Oto-Rhino-Laryngology highlights one such rare presentation: monophasic synovial sarcoma originating in the posterior pharyngeal wall.

Although uncommon, head and neck synovial sarcoma presents unique diagnostic and treatment challenges due to the complexity of surrounding anatomy and the critical functions involved in breathing, swallowing, and speech. Studies like this one provide valuable insight for clinicians and patients navigating these rare diagnoses.

A rare and challenging diagnosis

In this case, a 25-year-old patient presented with symptoms including difficulty breathing while lying down, snoring, and trouble swallowing solid foods. Initial imaging and biopsy suggested a benign tumor, a situation that is not uncommon with synovial sarcoma due to its tendency to appear well-defined and non-aggressive on early scans.

As symptoms progressed, further imaging and pathology revealed the diagnosis of monophasic synovial sarcoma of the posterior pharyngeal wall. This highlights a known challenge with synovial sarcoma: it can closely mimic benign conditions, leading to delays in diagnosis, particularly in rare anatomical locations like the head and neck.

Imaging and pathology findings

Advanced imaging showed a heterogeneous mass with areas of calcification—an imaging feature seen in a subset of synovial sarcoma cases. Definitive diagnosis was confirmed through histopathology, immunohistochemistry, and cytogenetic testing, which identified the characteristic t(X;18) chromosomal translocation associated with synovial sarcoma.

The tumor was classified as monophasic, meaning it consisted primarily of spindle-shaped cells, a subtype that is frequently misdiagnosed due to its resemblance to other soft tissue tumors.

Surgical treatment and reconstruction

The primary treatment approach was wide surgical excision aimed at achieving clear margins. Due to the tumor’s size and location, the surgery required complex access and reconstruction. The surgical team used a lateral trapezius flap—a less commonly used reconstructive technique—to repair the defect created after tumor removal.

This reconstructive approach allowed restoration of the pharyngeal wall while preserving critical structures involved in swallowing and airway protection. The study highlights this technique as a potential option for large defects in similar cases.

Role of additional therapies

Following surgery, the patient received radiation therapy. Chemotherapy was initiated but discontinued after one cycle due to side effects. At follow-up, the patient showed no evidence of disease and was able to resume oral intake with supportive therapy.

While the role of chemotherapy in head and neck synovial sarcoma remains debated, studies suggest that a multidisciplinary approach—including surgery, radiation, and careful long-term surveillance—offers the best chance for disease control.

Why this study matters

Although this case represents a single patient, it adds to a limited body of knowledge about synovial sarcoma in the head and neck region. For patients and families affected by synovial sarcoma outside of the extremities, studies like this help improve understanding of how the disease can present, how it is diagnosed, and what treatment options may look like.

Importantly, it also reinforces the value of second opinions, specialized pathology review, and care at centers experienced with sarcoma—especially when symptoms persist despite reassurance that a mass may be benign.

Looking ahead

Head and neck synovial sarcoma remains rare, but continued documentation and study are essential to improving diagnosis, treatment strategies, and long-term outcomes. Research like this contributes to ongoing efforts to refine surgical techniques, explore reconstruction options, and better understand the biology of this complex disease.

For patients navigating synovial sarcoma of the head and neck, awareness and advocacy remain critical tools—both for timely diagnosis and access to specialized care.

Content Warning:
This article references a published medical case study that includes graphic surgical images involving the head and neck region. While the information may be valuable and informative, some readers may find the images difficult to view. Please proceed with care. Original study here.

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