History of malignant neoplasm of head and neck cancer on the right, increased uptake on the right carotid bifurcation on PET and mass on US exam. 1. Neck MRIMotion artifacts degraded image quality.There is 9.4mm x 10mm x 12mm sized relatively well defined mass on the right carotid bifurcation. The mass shows high signal intensity on T2 weighted images with some signal void areas within the mass, low signal intensity on T1 weighted images and well enhancing on post Gad enhancement. These findings are consistent with paraganglioma (carotid body tumor).The right side neck shows decreased soft tissue and non visualization of platysma muscle as well as right submandibular gland indicating postoperative status. Left side submandibular gland is still well visualized.The orbits are unremarkable. The paranasal sinuses and mastoid air cells are clear. Limited view of the intracranial structure is unremarkable. The oral cavity, oro/nasopharynx, hypopharynx, larynx and subglottic airways are unremarkable/patent. The epiglottis, vallecula, piriform sinuses, and vocal cords are normal. The parotid, and thyroid glands are unremarkable. No lymphadenopathy or mass is noted. 2. Neck MRA3D MRA neck post-gadolinium images with maximum intensity projections of the cervical vasculature demonstrate normal flow enhancement in a normal aortic arch origin of the right brachiocephalic, left common carotid, and left subclavian arteries. The vertebral artery origins are normal. Right CCA bifurcation shows about 40% of luminal stenosis and the left CCA appears to be normal but tortuous. There is normal flow enhancement through the bilateral common carotid, carotid bifurcations, internal/external carotid, and vertebral arteries.
1. 9.4mm x 10mm x 12mm sized mass on the right carotid bifurcation. The MR characteristics and location of the mass is consistent with carotid body tumor.2. About 40% luminal stenosis on the right CCA bifurcation 