Colloid Cyst: A Potentially Life-Threatening Etiology of Severe Headache in a Patient With Migraine.

Headache is a common cause of emergency department (ED) visits. Migraine is a prevalent neurological disorder that is encountered by emergency physicians in day-to-day practice. However, patients with a known history of migraines should be carefully evaluated when presenting with headaches and serious pathologies of headache should be ruled out. We report the case of a 43-year-old woman, with a known history of classic migraine, who presented to the ED with a severe headache. She described the headache as persistent generalized pain. The headache was worse on awakening and bending. The headache did not improve with the use of oral sumatriptan. She reported that the current episode of headache is more severe than her usual migraine headaches. The patient underwent a cranial CT scan which demonstrated a homogenously hyperdense well-defined round lesion located in the midline at the approximate location of the foramen of Monro with prominent lateral ventricles, conferring the diagnosis of the colloid cyst. The patient underwent a right craniotomy with resection of the cyst using the transcallosal approach. Recognition of this important diagnosis is crucial to prevent serious neurological complications by having timely management.