Biomedical subjects
Publications and source records attributed to Sachin Gujar.
3 T MR imaging brings with it the possibility of a doubled signal-to-noise ratio compared with 1.5 T systems and the possibility of decreased scan times without reduction in quality. Higher cost and other issues however, also need to be examined.
Most neck masses in the pediatric head and neck region are benign. Congenital, developmental, and inflammatory lesions make up most of the masses in the pediatric head and neck. For example, neck masses due to inflammatory lymphadenitis are common in children because of the frequency of upper respiratory tract infections. Although many of the malignant tumors in children are found in the head and neck, they account for only a small portion of the neck masses. The choice of the imaging modality is based on a number of factors, several of which are unique to the pediatric population. Although the bulk of disease entities are adequately evaluated by CT, MRI can provide additional vital information in many cases. MRI provides better soft tissue characterization than CT, has multiplanar capabilities. In this article, we will attempt to provide an overview of conditions that present as neck masses.
Perineural invasion is a common mechanism of spread of head and neck cancers. Imaging plays an important role in detection of this condition because a large number of patients with perineural spread (PNS) are clinically asymptomatic. Accurate detection of PNS requires an understanding of anatomy of commonly involved neural pathways. High level of suspicion on the part of the radiologist, awareness of common imaging signs of PNS and careful attention to imaging technique can aid in earlier detection of this condition.
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A 5-year-old girl with no preexisting systemic or CNS neoplasm presented with a large right temporal mass lesion, the histopathology of which proved to be a poorly differentiated adenosquamous carcinoma, a highly unusual primary intracranial tumor. The tumor recurred despite radical resection, chemotherapy, and radiation therapy.