Normal lymph nodes and salivary glands in dogs
Figure 3.3. Normal lymph nodes and salivary glands. A: Illustration of the anatomical location of these structures in the canine neck. TB, tympanic bulla; EEC, external ear canal; PSG, parotid salivary gland; MSG, mandibular salivary gland; M, mandible; MLN, mandibular lymph nodes; RLN, retropharyngeal lymph node. B and C: Sagittal (B) and transverse (C) sonographic images of the mandibular salivary gland (MSG) and medial retropharyngeal lymph nodes (MRP). Cranial is to the left of the image. The MSG has a striated echotexture with a central linear echo. It is adjacent to the more hypoechoic digastric muscle overlying the hyperechoic interface of the mandibular ramus (MR). The MRP lymph node is more echogenic and located obliquely dorsomedial to the salivary gland. The lymph node is located lateral to the common carotid artery (ECA) in the transverse plane (C). D. Sagittal sonographic image of one of the mandibular lymph nodes. This node shows a hypoechoic halo in this asymptomatic dog, and is considered normal. E. Sagittal sonogram of the tympanic bulla. Note the hyper convex interface with deep acoustic reverberation. F. Sagittal image of the normal parotid salivary gland (PSG), which is located caudal to the external ear canal (EEC). Note that le gland partly encircles the canal ventrally.
Co-authored by Allison Zwingenberger and Olivier Taeymans.