Rihan Khan

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Objectives To describe the work-up and surgical management of an osteoblastoma involving the lateral skull base. Typically occurring in the spine or long bones, osteoblastomas of the craniofacial skeleton are exceedingly rare and infrequently reported. A review of the current literature regarding temporal bone osteoblastoma, diagnosis, and treatment is(More)
We would like to assess the effectiveness of intensity-modulated radiotherapy (IMRT) or image-guided radiotherapy (IGRT) to decrease the risk of osteoradionecrosis in locally advanced head and neck cancer. We conducted a retrospective study of 83 patients with head and neck cancer undergoing concurrent definitive chemoradiation, post-operative radiotherapy(More)
Magnetic resonance spectroscopy (MRS) is a non-invasive technique to detect metabolites within the normal and tumoral tissues. The ability of MRS to diagnose areas of high metabolic activity linked to tumor cell proliferation is particularly useful for radiotherapy treatment planning because of better gross tumor volume (GTV) delineation. The GTV may be(More)
BACKGROUND AND PURPOSE If magnetic resonance imaging (MRI) is to compete with computed tomography for evaluation of patients with acute ischemic stroke, there is a need for further improvements in acquisition speed. METHODS Inclusion criteria for this prospective, single institutional study were symptoms of acute ischemic stroke within 24 hours onset,(More)
Conventional catheter-based angiography, magnetic resonance imaging/angiography, and computed tomographic angiography are all techniques routinely practiced for the diagnosis of aneurysms. With regard to the evaluation of treated aneurysms, each of these imaging modalities has inherent advantages and disadvantages. This review was aimed to provide a better(More)
A case of false-negative contrast magnetic resonance angiography (MRA) in the setting of significant carotid stenosis caused by a carotid arterial intimal dissection is described. If arterial dissection is suspected but contrast MRA is normal, additional evaluation may be warranted. In this case the abnormality was detectable on 2D time-of-flight MRA and(More)
BACKGROUND The standard of care for locally advanced anal cancer has been concurrent chemoradiation. However, conventional treatment with 3-dimensional radiotherapy is associated with significant toxicity. The feasibility of new radiotherapy techniques such as image-guided radiotherapy (IGRT) in combination with chemotherapy for the treatment of this(More)
Multidetector CT has become widely available and with it the ability to rapidly create detailed reformatted images. Multiplanar images can be created depicting the anatomy in planes other than the traditional axial plane, using isotropic to near-isotropic data. It is important for both clinicians and radiologists to be aware of this capability in order to(More)
Advances in technology and software applications have contributed to new imaging modalities and strategies in the evaluation of patients with suspected acute cerebral infarction. Routine computed tomography (CT) and magnetic resonance imaging (MRI) have been the standard studies in stroke imaging, which have been complemented by CT and MR angiography,(More)
PURPOSE The study aims to assess the tolerance of elderly patients (70 years or older) with locally advanced rectal cancers to image-guided radiotherapy (IGRT). A retrospective review of 13 elderly patients with locally advanced rectal cancer who underwent preoperative chemoradiation using IGRT was performed. Grade 3-4 acute toxicities, survival, and(More)