The Medical Challenge: An Exceptional Desmoid Tumor Within the Trapezius Muscle

This is the authors' abstract. We don't add key points for this paper.

Desmoid tumors localized in the trapezius muscle are rare neoplasms characterized by their benign nature but local invasive capacity, associated with a significant rate of morbidity, a tendency for recurrence, and a propensity to infiltrate surrounding tissues. An unusual case was observed in a 39-year-old man with no history of trauma, pre-existing tumors, or familial diseases related to the head and neck region. This patient presented with a left postero-lateral cervical swelling evolving over eight months. Imaging studies, including CT scan and MRI, revealed a mass involving the trapezius muscle, later confirmed to be a desmoid tumor following a biopsy. Immunohistochemical analyses showed positive cytoplasmic staining with an anti-AML antibody and nuclear staining with an anti-beta-catenin antibody. A comprehensive evaluation of this case was conducted by a multidisciplinary team. The patient was closely monitored clinically and radiologically, with check-ups every six months for two years, followed by annual check-ups for five years. Throughout this period, the tumor size remained stable, without signs of infiltration into surrounding tissues or troublesome symptoms for the patient. Consequently, a decision for regular follow-up was made, without the need for medical or surgical treatment. Despite the benign nature of desmoid tumors, the risk of invading neighboring structures, recurrence, and mortality remains significant, emphasizing the critical importance of early diagnosis and appropriate management of these conditions.