Pelvic lesion in a female patient: Seventeen years later after thymectomy for myasthenia gravis

Myeloid sarcoma is a rare neoplasia consisting of immature myeloid cells localized at an extramedullary site. We report a case of a 55-year-old woman with a past medical history of myasthenia gravis (MG) disease treated with thymectomy 17 years earlier who presented with a painful lesion in her right acetabulum. Findings from pathology and imaging are consistent with the diagnosis of a myeloid sarcoma. The patient was treated with chemotherapy with an Acute Myeloid Leukemia protocol. At 1-year following initial presentation, PET scans reveal no further evidence of disease. Further follow up and surveillance is needed to determine if the patient will remain free of disease and recurrence.