Axillary synovial sarcoma recurrence involving brachial plexus, a rare case report from Pakistan

INTRODUCTION: Synovial sarcomas are rare tumors, and the incidence of axillary synovial sarcoma involving the brachial plexus has been reported as 2.9 % among all axillary soft tissue tumors. However, the recurrence of axillary synovial sarcomas has not been reported in literature. CASE PRESENTATION: A 36-years-old Afghan female presented in Karachi, Pakistan with a history of persistently increasing, recurrent, right axillary mass for 6 months. Initially diagnosed as a spindle-cell tumor on excision in Afghanistan, she had received ifosfamide and doxorubicin, but the lesion recurred. On examination, it was a 5 × 6 cm, hard mass palpable in right axilla. After radiological work-up and a multidisciplinary team discussion, she underwent complete excision of the tumor with successful preservation of brachial plexus. The final diagnosis was reported as monophasic synovial sarcoma FNCLCC Grade 3. DISCUSSION: Our patient presented with a recurrent right axillary synovial sarcoma that was involving the axillary neurovascular bundle and brachial plexus, which was initially diagnosed as a spindle cell sarcoma. Pre-operative core-needle biopsy was unable to provide a definitive diagnosis. MRI scan was useful in delineating the proximity of the neurovascular structures. Re-excision of the tumor was performed which is the mainstay of treatment for axillary synovial sarcomas, combined with radiotherapy depending on the disease grading, staging and patient factors. CONCLUSION: Axillary synovial sarcoma recurrence with involvement of the brachial plexus is an extremely rare presentation. Our patient was successfully managed through a multidisciplinary approach with complete surgical excision and preservation of the brachial plexus followed by adjuvant radiotherapy.