Last updated 2 years ago
Parotid gland, right, transverse. After treatment, two fragments (S, S) can now be seen, which, in part, have measurements greater than the original stone. Fragmentation (lithotripsy) of a stone makes its structure less compact, which may cause an apparent increase in size. DS, parotid (Stensen) duct; GLP, parotid gland; UK, mandible
(Left) Transverse grayscale US shows acute parotitis in a patient receiving radiation therapy for H&N cancer Note diffuse enlargement of parotid gland rounded contours, heterogeneous parenchymal echo pattern, and subcutaneous edema Multiple, hypoechoic bands (avascular on Doppler) are seen wthin parenchyma, representing interstitial edema. (Right) Corresponding longitudinal US shows extent of parotid involvement. Such glands are usually tender on transducer pressure
(Left) Transverse grayscale US in a patient ith bacterial parotitis shows diffuse enlargement of the paroticd gland with rounded contours. Note the diffuse hypoechoic, heterogeneous parenchymal echo pattern typically seen with acute parotitis. Intraparotid duct is mildly dilated with debris within. No obvious calculus is seen. Note thickening of overlying subcutaneous tissue (Right) Corresponding power Doppler US shows increased vascularity in the salivary parenchyma, a feature of acute paroti
(Lef) Longitudinal grayscale US shows diffuse, smooth dilatation of a parotid duct as it passes over the masseter muscle toward its intraoral opening after piercing the buccinator muscle. Note the mandibular cortex (Right) Corresponding MR sialogram demonstrates the entire length of dilated intraparotid duct with no obvious focal intraductal calculus. This patient had a history of recent passage of parotid calculus.
(Left) Longitudinal grayscale US shows focal, hypoechoioc, areas within parotid gland, mimicking focal acute parotitis. Non dilated intraparotid duct is seen as an echogenic linear structure within parenchyma (Right) Transverse grayscale US of the submandibular gland (SMG) (same patient) shows characteristic "cirrhotic appearance, a feature of chronic sclerosing sialadenitis. These patients have painless enlargement o multiple salivary glands, SMG >parotid
(Left Transverse grayscale US in a child with mumps parotid gland shows enlargment of parotid galnd and diffuse hypoechoic parenchymal echo pattern. No focal duct dilatation or calculus is seen. Note the mandibular cortex (Right) Corresponding longotudinal grayscale US shows extent of involvement of the parotid gland Such parotitis is usually self- limiting and seen in children who have not received MMR vaccination, and usually no imaging is required.
(Left) Transverse grayscale US at floor of mouth (FOM) of same patient clearly identifies a large calculus witn an associated abscess Note the clear depiction of adjacent anatomy; mylohyoid muscle and anterior belly of digastric muscle (Right) Corresponding axial CECT shows the large calculus and the associated rim-enhancing abscess at FOM but does not add any additiona lnfrmation compared to prior US in this case
(Left) Clinical photograph shows a patient presenting with fever and painful submandibular swelling (Right) Corresponding transverse grayscale US shows a large, extraglandular, echogenic calculus within the associated abscess Note the heterogeneous echo pattern of the submandibular gland (SMG) indicating sialadenitis and the dilated proximal Wharton duct as it exits the SMG.
Transverse view of the right side of the neck at level I in a 6-year-old child, CCDS. An oval lymph node in acute lymphadenitis colli (RF) The node measures approximately 25mm (to visually estimate the size the scale at the right-hand side of the image above the pictogram can be used). The central vascular structures can be seen branching out from the left upper side of the echogenic "hilar sign." The perfusion is particularly intensive because the acuteness of the infective process and is consi