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Azureu
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Patterns of Lymph Node MetastasisThe regional lymphatic drainage of the neck is divided into seven levels. These levels allow for a standardized format for radiologists, surgeons, pathologists, and radiation oncologists to communicate concerning specific sites within the neck and does not represent regions isolated by fascial planes. The levels are defined as the following:
• Level I—the submental and submandibular nodes• Level Ia—the submental nodes; medial to the anterior belly
of the digastric muscle bilaterally, symphysis of mandible superiorly, and hyoid inferiorly
• Level Ib—the submandibular nodes and gland; posterior to the anterior belly of digastric, anterior to the posterior belly of digastric and inferior to the body of the mandible
• Level II—upper jugular chain nodes
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• Level IIa—jugulodigastric nodes; deep to sternocleidomastoid (SCM) muscle, anterior to the posterior border of the muscle, posterior to the posterior
aspect of the posterior belly of digastric, superior to the level of the hyoid, inferior to spinal accessory nerve (CN XI)
• Level IIb—submuscular recess; superior to spinal accessory nerve to the level of the skull base
• Level III—middle jugular chain nodes; inferior to the hyoid, superior to the level of the hyoid, deep to SCM from posterior border of the muscle to the strap muscles medially
• Level IV—lower jugular chain nodes; inferior to the level of the cricoid, superior to the clavicle, deep to SCM from posterior border of the muscle to the strap muscles medially
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• Level V—posterior triangle nodes• Level Va—lateral to the posterior aspect of the
SCM, inferior and medial to splenius capitis and trapezius, superior to the spinal accessory nerve
• Level Vb—lateral to the posterior aspect of SCM, medial to trapezius, inferior to the spinal accessory nerve, superior to the clavicle
• Level VI—anterior compartment nodes; inferior to the hyoid, superior to suprasternal notch, medial to the lateral extent of the strap muscles bilaterally
• Level VII—paratracheal nodes; inferior to the suprasternal notch in the upper mediastinum
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Table 17-3 TNM Staging for Oral Cavity Carcinoma
Primary tumor TX Unable to assess primary tumor T0 No evidence of primary tumor Tis Carcinoma in situ T1 Tumor is <2 cm in greatest dimension T2 Tumor >2 cm and <4 cm in greatest dimension T3 Tumor >4 cm in greatest dimension T4 (lip) Primary tumor invading cortical bone, inferior alveolar
nerve, floor of mouth, or skin of face (e.g., nose or chin) T4a (oral) Tumor invades adjacent structures (e.g., cortical bone,
into deep tongue musculature, maxillary sinus) or skin of face T4b (oral) Tumor invades masticator space, pterygoid plates, or
skull base and/or encases the internal carotid artery
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Regional lymphadenopathy
NX Unable to assess regional lymph nodes N0 No evidence of regional metastasis N1 Metastasis in a single ipsilateral lymph node, 3 cm
or less in greatest dimension N2a Metastasis in single ipsilateral lymph node, >3 cm
and <6 cm N2b Metastasis in multiple ipsilateral lymph nodes, all
nodes <6 cm N2c Metastasis in bilateral or contralateral lymph
nodes, all nodes <6 cm N3 Metastasis in a lymph node >6 cm in greatest
dimension
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Distant metastases MX Unable to assess for distant metastases M0 No distant metastases M1 Distant metastases
TMN staging Stage 0 Tis N0 M0 Stage I T1 N0 M0 Stage II T2 N0 M0 Stage III T3 N0 M0 T1-3 N1 M0 Stage IVa T4a N0 M0 T4a N1 M0 T1-4a N2 M0 Stage IVb Any T N3 M0 T4b Any N M0 Stage IVc Any T Any N M1
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Muscles of the Neck
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Muscles of the Tongue
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Muscles of Palate & Pharynx