Citations

Abstract OBJECTIVE The purpose of this study was to better define the management of intracranial infectious aneurysms. METHODS We present a retrospective review of the management of 16 patients with intracranial infectious aneurysms. The mean follow-up period was 86 months. RESULTS None of the patients had a rehemorrhage during antibiotic treatment. The mortality and long-term outcome from ruptured intracranial infectious aneurysms may be better than previously thought. There was no significant difference in long-term outcome between patients with single or multiple infectious aneurysms or between patients who underwent surgical resection and those who were treated only with antibiotics. CONCLUSION Operative treatment should be pursued for patients with ruptured infectious aneurysms. Patients with unruptured intracranial infectious aneurysms should be observed during antibiotic therapy and followed up with cerebral angiography. Surgical resection should be considered if the aneurysm enlarges and the patient's general medical condition allows general anesthesia to be tolerated.

Abstract OBJECTIVE AND IMPORTANCE Heterotopic ossification (“neuritis ossificans”) is among the least frequently encountered reactive lesions in peripheral nerves. Only two cases have been described previously, one in the median nerve of a 34-year-old man, and the other in the ulnar nerve of an adult woman. The architecture of this lesion is distinctly zonal. Consisting of a central fibroblastic core, an intervening zone of osteoid production, and a peripheral layer of ossification, the pattern is remarkably similar to that of myositis ossificans. This similarity and the occurrence of the process in superficial nerves have led to speculation that trauma plays a role in its pathogenesis; this hypothesis remains unproved. We describe two additional cases of neuritis ossificans. CLINICAL PRESENTATION One patient, a 41-year-old man, experienced pain and numbness in the left leg for several months but had no history of local trauma. A mass was detected in the saphenous nerve. The second patient, a 16-year-old boy, noted subacute onset of pain in the popliteal fossa and decreased sensation in the distribution of the lateral sural cutaneous nerve. A mass was found within the tibial nerve at the knee level. INTERVENTION In each patient, resection of the mass required sacrifice of a segment of the nerve. CONCLUSION In each patient, the mass was composed of fibrovascular tissue with osteoid and bone deposition arranged in a zonal pattern. The ossifying process was intraneural but encased rather than directly involving nerve fascicles. These exceptionally intact examples of neuritis ossificans underscore its resemblance to myositis ossificans. Nerve-sparing resection of such masses is not always possible.

Abstract OBJECTIVE AND IMPORTANCE We report the case of a 29-year-old man with Gardner syndrome and an isolated, giant cerebellopontine angle craniopharyngioma. Our description of this patient is only the second case report of a craniopharyngioma arising primarily in the cerebellopontine angle. CLINICAL PRESENTATION The patient presented with a 1-year history of progressive neurological impairment and headache. On the basis of the patient's history of multiple dermal fibromas, a cranial osteoma, familial adenomatous polyposis (FAP), a total abdominal colectomy, and an adenoma of the ampulla of Vater, we diagnosed the patient's condition as Gardner syndrome. INTERVENTION Magnetic resonance imaging showed a large cerebellopontine angle tumor, which was removed through a suboccipital retromastoid craniotomy. The pathological features were those of an adamantinomatous craniopharyngioma. The patient has done well postoperatively and has no new neurological deficits. A careful retrospective review of the preoperative imaging shows that this tumor was located exclusively in the posterior fossa and was not an extension of a sellar, suprasellar, or clival craniopharyngioma. CONCLUSION We present the second reported case of FAP and craniopharyngioma. There is no known genetic link between FAP and craniopharyngioma. Now that the patient has manifested a primary tumor of the central nervous system with FAP, it is unclear whether he should be classified as having Turcot syndrome. For this patient, we recommended vigilant follow-up imaging and forgoing external beam radiotherapy unless there is a documented recurrence of his craniopharyngioma.

Abstract OBJECTIVE AND IMPORTANCE Cerebellar hemorrhage remote from the site of surgery may complicate neurosurgical procedures. We describe our experience with two cases of cerebellar hemorrhage after spinal surgery and review the three cases previously reported in the literature to determine whether these cases provide insight regarding the pathogenesis of remote cerebellar hemorrhage. CLINICAL PRESENTATION One of our patients developed cerebellar hemorrhage in the vermis and right hemisphere after transpedicular removal of a partially intradural T9–T10 herniated disc with the patient in the prone position. The other patient developed cerebellar hemorrhage in the vermis and bilateral hemispheres after L3–S1 decompression and instrumentation with the patient in the prone position, during which the dura was inadvertently opened. INTERVENTION The first patient was treated conservatively and had mild residual dysarthria and gait ataxia 2 months after surgery. The second patient underwent exploration and revision of the lumbar wound with primary dural repair. The cerebellar hemorrhage was treated conservatively, and the patient had mild dysarthria and ataxia 1 month after surgery. CONCLUSION Cerebellar hemorrhage must be considered in patients with unexplained neurological deterioration after spinal surgery. Dural opening with loss of cerebrospinal fluid has occurred in every reported case of cerebellar hemorrhage complicating a spinal procedure, supporting the hypothesis that loss of cerebrospinal fluid is central to the pathogenesis of this condition. Because remote cerebellar hemorrhage can occur after procedures with the patient in the supine, sitting, and prone positions, patient positioning seems unlikely to play a causative role in its occurrence.

Abstract OBJECTIVE AND IMPORTANCE: Optic nerve choristoma is a rare lesion composed of adipose tissue and smooth muscle involving the optic nerve. Few cases have been reported. CLINICAL PRESENTATION: A 20-year-old woman presented with a history of slowly progressive visual loss in the left eye. On T1-weighted magnetic resonance imaging studies, after frequency-selective fat saturation, an optic nerve mass was detected at the level of the optic canal with signal characteristics suggesting the diagnosis of optic nerve lipoma. INTERVENTION: At left frontotemporal craniotomy, the intracranial optic nerve appeared thin and atrophic proximally and was covered by abundant adipose tissue distally. Because no cleavage plane could be identified between the fatty lesion and the optic nerve, which appeared splayed within the adipose tissue, the nerve was resected after an intraoperative biopsy. The presence of two heterotopic mesodermal elements, a rim of adipose tissue admixed with bundles of mature smooth muscle, extending into the nerve septa, warranted a diagnosis of optic nerve choristoma. CONCLUSION: Optic nerve choristoma is an uncommon optic nerve lesion. Even if imaging studies are highly suggestive of the diagnosis, pathological confirmation is required because of the high adipose tissue content in the majority of cases. The lesion, most likely malformative and nonneoplastic in nature, can be the cause of progressive visual loss.