Myasthenic Crisis Manifesting as Postoperative Respiratory Failure following Resection of Unsuspected Intrathoracic Thymic T-Cell Lymphoma during Thyroidectomy for an Adjacent Large Retrosternal Goiter

A middle-aged female with a goiter of 10 years' duration presented with progressive pressure symptoms, nocturnal choking and dyspnea on exertion for 5 months. Physical examination demonstrated a large simple multinodular goiter. Imaging revealed a deep retrosternal goiter extending below the tracheal bifurcation with marked tracheal deviation. Total thyroidectomy was carried out via a cervical approach and a median sternotomy. Extubation was not possible, and the patient had to be kept intubated. She then went into a myasthenic crisis. Initial ventilatory support was followed by intravenous immunoglobulin, steroids and pyridostigmine. The patient had complete remission and was asymptomatic 18 months later. Histopathology showed a T-cell-rich thymoma in addition to a nodular colloid goiter.