ABSTRACT
A 68-year-old man with a diagnosis of transformation to undifferentiated carcinoma of the left thyroid who was being treated with Lenvatinib presented with swelling and pain around the left clavicle, and tramadol was started. Two days later, he developed diarrhea, sweating, disorientation, and myoclonus, leading to a diagnosis of serotonin syndrome. He also exhibited dyskinesia including involuntary movements of the arms and legs and squirming movements of the trunk. Tramadol was thus discontinued. His myoclonus and dyskinesia resolved within half a day and had disappeared the day after tramadol discontinuation. These symptoms were attributed to tramadol because there was a reasonable temporal relationship between drug administration and the adverse event. Tramadol inhibits serotonin reuptake, and thus has the potential to cause serotonin syndrome. However, there have been relatively few reports describing the occurrence of this syndrome, and there have been none showing concomitant dyskinesia. Clinicians should be aware that tramadol can cause serotonin syndrome accompanied by dyskinesia.
ABSTRACT
<p>Introduction: We report a case of severe headache caused by lung cancer metastasis to the base of the skull that was difficult to diagnose due to a lack of imaging evidence. Case: A 70-year-old man diagnosed with advanced lung cancer experienced sudden, severe headache. He was diagnosed as having a tension-type headache because magnetic resonance imaging of his head failed to detect any pathology. He was prescribed various drugs, which except for strong opioids failed to treat his headache. He referred to our palliative care unit to treat the pain. Re-evaluation of his head CT revealed metastasis to the clivas. His pain was treated with rapid titration of subcutaneous oxycodone injection. Conclusion: Even if radiographic investigations fail to identify the metastasis, the patient should be re-evaluated if the headache worsens and/or is accompanied with cranial nerve dysfunction.</p>