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Arthur R. Kurzbuch and Shailendra Magdum

M ost cases of the rarely occurring occipital intradiploic pseudomeningoceles are of traumatic or idiopathic origin, 1 , 5 , 17 , 27 and only a few reported cases have occurred postoperatively. 3 , 11 , 23 , 24 , 28 , 31 Postoperative development of syringomyelia has been mainly described following spinal CSF drainage, 7 , 14 , 26 , 30 and anecdotally after pleural effusion aspiration 32 and after surgery for spontaneous subdural hematoma. 2 There is to our knowledge only one previous study of de novo syrinx formation, which included 7 pediatric patients

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Arun-Angelo Patil and Hamid Etemadrezaie

P osttraumatic intradiploic cerebrospinal fluid (CSF) cysts are rare lesions of the skull. Different types of these lesions have been described in the literature. They include intraosseous leptomeningeal cyst, 2, 5 traumatic and posttraumatic arachnoid cyst, 6, 7 intradiploic arachnoid cyst, 9 and intradiploic CSF fistula. 1 The common features of these cysts are intact outer table, CSF-filled cyst, and defect in the inner table and the dura. The cysts are generally lined with arachnoid membrane. In this report we present a new variation of the

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Mudumba Vijayasaradhi, Shantiveer Gurulingappa Uppin, Vuyyuri Sreedhar, Challa Sundaram and Manas K. Panigrahi

A ngioleiomyoma is rare benign tumor that arises from smooth muscle cells, and is a variant of the more commonly occurring leiomyoma. 1 , 5 Primary leiomyoma of bone is more common in the facial bones and is rarely reported in the skull bones. 3 Angioleiomyoma of bone is rare and involvement of skull bone is extremely rare. 6 , 7 We report on a case of angioleiomyoma arising from the intradiploic space of the left frontal bone in a 10-year-old girl. Case Report History and Examination This 10-year-old girl, who had apparently been

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Juan F. Martínez-Lage, Francisco López, Claudio Piqueras and Máximo Poza

enlarging cranial defect developed after craniosynostosis repair, 9, 12, 15, 18, 19 whereas in the other it happened after inadvertent skull penetration during surgery for temporomandibular joint ankylosis. 16 In this report we document for the first time the accidental production of an iatrogenic intradiploic meningoencephalocele after craniosynostosis surgery and discuss the pathogenetic mechanisms involved in its formation. Case Report History This patient was first seen at the age of 1 month for craniofacial dysmorphism. She had been born at term after an

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Edward J. Kosnik, John N. Meagher and Lowell R. Quenemoen

, seemingly lytic process involving the left parietal bone ( Fig. 1 ). Its margins were scalloped with islands of increased density in the central portion. An electroencephalogram demonstrated moderate 4 Hz slowing with spike activity in the left parietal area. A brain scan was normal. Selective left internal and external carotid angiograms were normal. Preoperative diagnoses included benign intradiploic bone cyst, dermoid skull tumor, and metastatic carcinoma (metastatic bone survey was negative). Fig. 1. Skull film showing the large left parietal defect. There

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Intradiploic arachnoid cysts

Report of two cases

Martin E. Weinand, Setti S. Rengachary, Douglas H. McGregor and Itaru Watanabe

C ircumscribed lytic lesions of the skull pose a diagnostic challenge to the neurosurgeon and the radiologist. The differential diagnosis includes dermoid or epidermoid cyst, hemangioma, eosinophilic granuloma, plasmacytoma, and metastatic tumor. Although a tentative diagnosis is often possible based on the history, clinical course, and radiological features, the definitive diagnosis may not be established without an excisional biopsy. Two cases are reported of intradiploic arachnoid cysts which presented as lytic lesions of the skull. Based on

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Atul Goel, Ketan Desai and Satyajit Patil

I ntradiploic hematomas are rare. In our literature search we found reports of only three such cases. 1, 3, 6 Here we describe an extremely unusual case of intradiploic hematoma that progressively increased in size in a malignant fashion. Such a diploic hematoma in a patient with no significant precipitating factor or hematological disorder has yet to be reported. Case Report History and Examination This 58-year-old man presented with a painless bone lesion over the left forehead that had gradually increased in size during the previous 2 years. The swelling

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Rajinder Kumar, Sarat P. Chandra and Bhawani Shanker Sharma

I ntradiploic CSF collections are rare lesions of the skull. They have been given different names by different authors, such as intraosseous leptomeningeal cyst, 3 , 7 posttraumatic intradiploic arachnoid cyst, 1 , 11 , 14 intradiploic pseudomeningocele, and intradiploic CSF fistula. 16 The common features of these cysts are intact outer table, CSF-filled cyst, and defect in the inner table and the dura mater. The smaller cysts are generally lined with arachnoid membrane. The CT scan reveals a hypodense intradiploic lesion. The fracture of the inner

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Dimitris G. Placantonakis, Eric Lis and Mark M. Souweidane

E xpansive CSF accumulation within the diploic space Eis an exceedingly rare condition. Intradiploic CSF accumulations fall into two distinct categories. First, when no traumatic origin can be identified, the lesion is called an intradiploic arachnoid cyst. 2 , 3 , 5 , 13 , 14 Some authors have hypothesized that such cysts may be congenital. 13 Second, these highly unusual CSF accumulations can present as the result of a traumatic fracture or surgical intervention and are thus called intradiploic CSF fistulas. 1 , 4 , 6–12 In this paper we describe two

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Jean Paul Constans, Jean François Meder, Enrico De Divitiis, Renato Donzelli and Francesco Maiuri

E pidermoid cysts are relatively uncommon. According to Lepoire and Pertuiset, 12 epidermoid tumors represent only 1% of intracranial tumors. They can occur within the diploe, 9, 25 in the cranial cavity, 6, 21 or in the spinal canal. 14 Intradiploic epidermoid cysts are less common than the intradural varieties. 10 They are derived from ectodermal cell rests that remain within the cranial bones during embryonic development. 6, 15, 23, 24, 27 Müller 15 was the first to describe a diploic epidermoid cyst of the skull in 1838. Bucy 1 reported finding