Granulomatous meningitis and diffuse parenchymatous degeneration of the nervous system due to an intracranial epidermoid cyst.

Clinical characteristics and diagnostic imaging of epidermoid tumors

“…17 Sequelae of aseptic meningitis can be serious, as demonstrated by a fatal case following cystic rupture into the 4th ventricle reported by Olivicrona. 6,14,22,32,48 Sudden death has also been reported in cases of rupture into the 3rd ventricle. 32 Mahoney et al studied the role of epidermoid cyst rupture in aseptic meningitis by injecting cholesterin, a byproduct of keratin decomposition, into the subarachnoid space and cerebral cortex.…”

Epidermoid cysts of the cavernous sinus: clinical features, surgical outcomes, and literature review

“…4,13,23 In addition to the original contents of the epidermoid cysts, hemorrhage or granuloma tissue can also occur inside the cysts with lesion progression. 4,13,25,30 In our series, 9 patients (29.0%) exhibited such a mixed radiological appearance. These findings must be differentiated from lesions such as neurinoma or cholesterol granuloma.…”

Spontaneously Hemorrhagic Epidermoid Cyst and Arachnoid Cyst Mimicking One Another

“…He argued that angiography is required for the investigation of intracystic hematoma of an AC, especially in the absence of head injury, to avoid delayed diagnosis of any ruptured aneurysm. 15 In several epidermoid cases, we have done electron microscopic examination of pericystic vessels and found them to be with degenerative changes (Figures are not shown). 12 Another hypothesis is spontaneous or traumatic rupture of the intracystic or bridging vessels.…”