An aneurysm rupturing into a middle cranial fossa arachnoid cyst presenting as an intracystic hemorrhage.

We report a case of an aneurysm rupturing into an arachnoid cyst presenting as a confined intracystic hemorrhage. A 37-year-old man with a history of sporadic headaches for several years complained of a headache of several days' duration. Brain computed tomography and magnetic resonance imaging revealed a cystic lesion in the left side of the middle cranial fossa that included a 3-cm-diameter hematoma in the Sylvian fissure without extracystic hemorrhage.

Spontaneous regression of an asymptomatic meningioma associated with discontinuation of progesterone agonist administration.

An 80-year-old male visited the hospital as an outpatient with a head injury sustained in a traffic accident. Brain computed tomography incidentally revealed a left frontal lobe tumor measuring 5 cm in a diameter. The patient had a history of taking chlormadinone acetate (a progesterone agonist) prescribed several years previously as treatment for benign prostatic hypertrophy.

Microscopic measurement of the facial nerve root exit zone from central glial myelin to peripheral Schwann cell myelin.

Object: The authors have attempted to define the exact borders of the root exit zone (RExZ) of the facial nerve, measure the distribution of myelin histologically, and examine the relationship between contact vessels and the RExZ.

Methods: Seventy-five facial nerves were obtained from brainstems excised from 44 adult patients at autopsy. The arteries and veins associated with the facial nerve were counted and measured.