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Furthermore, it is the best modality for the depiction of possible periosteal reaction.A better tissue characterisation and evaluation of bone marrow involvement is obtainable on MRI.They receive blood from superficial cortical and meningeal veins, and CSF from AG.
Their interpretation requires the evaluation of several pieces of information, among which are imaging characteristics and clinical setting.
Osteolytic lesions usually pose greater diagnostic dilemmas, as they share many imaging features.
However, larger lesions have been reported, presenting with signs of intracranial hypertension and focal neurological signs. 3, the lesion appears slightly inhomogeneous, mostly hyperintense on T2w (a) and hypointense on T1w (b) images, without contrast enhancement (c), showing diffusion restriction on b 1000 diffusion-weighted imaging (DWI) and the apparent diffusion coefficient (ADC) map (d, e).
IECs are benign, with infrequent malignant transformation, which may occur especially in cases of recurrence due to incomplete resection. It causes compression on the confluence of sinuses (sagittal contrast-enhanced T1w image, f).
In a caudal slice, a right parasagittal AG can be depicted (c, d)Lesions with inclusion of ectopic tissue consist of epidermoid and dermoid cysts (ECs and DCs, respectively), differing in complexity .
Several theories have been proposed to explain their development: they may derive from ectodermal inclusions during neural tube closure from the third to fifth weeks of embryogenesis or be acquired as a result of trauma or surgery.
An intradiploic location is less common compared to other intracranial locations .
Intradiploic epidermoid cysts (IECs) are the most common, occurring at any age from the first to seventh decades of life, with no gender prevalence.
Skull X-ray is usually the first diagnostic tool on which lesions are identified, but its use is decreasing due to the availability of more accurate imaging techniques, such as computed tomography (CT) and magnetic resonance imaging (MRI).
CT is useful for the evaluation of lesion density (sclerotic or osteolytic), extension assessment (focal or diffuse) and recognition of possible pathognomonic patterns, such as the trabecular pattern of haemangioma.