Direct imaging findings of dissection were well visualised by HR-MRI. Detection of a dissection flap on CE-T1WI is the most reliable diagnostic finding. HR-MRI could be a useful diagnostic tool for intracranial VBDs.

BACKGROUND AND PURPOSE:The histogram method has been shown to demonstrate heterogeneous morphologic features of tumor vascularity. This study aimed to determine whether whole-tumor histogram analysis of the normalized CBV for contrast-enhancing lesions and perienhancing lesions can differentiate among GBMs, SMTs, and lymphomas.

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BACKGROUND AND PURPOSE: CT perfusion (CTP) is a more readily accessible method for evaluation of cerebral perfusion than single-photon emission CT (SPECT). We assessed whether there is any resting or drug-challenged CTP parameter correlating with cerebrovascular reserve (CVR) obtained by SPECT in Moyamoya patients.

The MRI grading of osteochondral lesions in the talus was useful and showed a fairly good correlation with arthroscopic classification.

ObjectiveTo develop a radiological classification system for talocalcaneal coalition suitable for adults.Methods and materialsA retrospective review was performed on patients diagnosed with talocalcaneal coalition from July 2001 to November 2011. Based on the cartilaginous or bony nature, facet joint orientation and bony structure morphology, we classified talocalcaneal coalitions into four types: I (linear with or without posterior hooking), II (talar overgrowth), III (calcaneal overgrowth) and IV (complete osseous).ResultsSeventy feet (59 patients) with talocalcaneal coalition were evaluated by CT (61/70 feet) using multi-planar reformation and/or magnetic resonance imaging (43/70 feet). Type I, II, III and IV coalitions were detected in 45 (64 %), 10 (14 %), 13 (19 %), and 2 feet (3 %), respectively. Fracture fragments were observed in 16 feet (seven Type I and nine Type III coalitions) with hooked or overgrown calcanei and in one foot in the talus (Type I). Eleven patients had bilateral talocalcaneal coalitions; ten patients had coalitions of the same type and one had both Type I and Type III coalitions. Among 48 patients with unilateral involvement, the left and right feet were affected in 26 and 22 patients, respectively.ConclusionsA classification system for talocalcaneal coalition based on multi-planar imaging studies was developed.Key Points• A classification system for talocalcaneal coalition based on multi-planar imaging was developed.• The relative frequencies of different talocalcaneal coalition types were determined.• Fracture fragments were easily distinguished and frequently originated from the calcaneus.• Fracture fragments were mostly associated with Type I (linear) with posterior hooking and Type III (calcaneal overgrowth).

Meningioma rarely manifests as a subarachnoid hemorrhage (SAH), and invasion directly into a major intracranial artery is extremely rare. To the best of our knowledge, meningioma presenting with an SAH associated with major intracranial arterial invasion has never been reported. We present a case of sphenoid ridge meningotheliomatous meningioma manifesting as an SAH without pathologically atypical or malignant features, due to direct tumor invasion into the middle cerebral artery.