Financial Disclosures But first… • Please direct your smart phone, tablet, or laptop’s browser to: Objectives • Review Infrahyoid Neck Anatomy – Deep Spaces – Nodal Stations • Cases, Cases, Cases – Tackle challenging cases – Develop an appropriate differential diagnosis – Identify useful discriminators • Multiple choice questions Anatomy Anatomic Spaces of Infrahyoid Neck Carotid Space Visceral Space Retropharyngeal Space Perivertebral Space Posterior Cervical Space Infrahyoid Lymph Node Stations Cases Case 1 • 65 year-old woman with neck pain, palpable lump Differential Diagnosis • Differentiated Thyroid Ca • Medullary Thyroid Ca • Anaplastic Thyroid Ca • Thyroid NHL • Multinodular Goiter Most Likely Diagnosis • Differentiated Thyroid Ca (DTCa) • • • • • • Age & Sex Ill-defined Infiltrating, invasive Mixed solid/cystic Intra-thyroidal Calcs • Intra-thyroidal • Intra-nodal • Adenopathy • Some solid • Some cystic • Punctate calcs Question 1 • Which of the following is a TRUE statement? – A. Follicular is the most common subtype of DTCa – B. Hematogenous spread is more commonly associated with Papillary carcinoma – C. The peak incidence of DTCa is seen in women in the third or fourth decade – D. Rising free T4 is a clinical marker for disease recurrence Question 1 • Which of the following is a TRUE statement? – A. Follicular is the most common subtype of DTCa – B. Hematogenous spread is more commonly associated with Papillary carcinoma – C. The peak incidence of DTCa is seen in women in the third or fourth decade – D. Rising free T4 is a clinical marker for disease recurrence DTCa Companion Cases 1) 75 year-old-woman, neck lump 2) 48 year-old-woman, enlarging mass 3) Nodal Manifestations of DTCa 4) 30 year-old-woman, adenoma Magnified Cor CECT of LN Case 2 • 55 year-old-woman with right neck mass, cough Differential Diagnosis • H&N SCCa Metastatic Nodes • Systemic Nodal Metastases • Thyroid Ca Metastatic Nodes • HL or NHL Nodes • Granulomatous Lymph Nodes • Reactive Adenopathy Most Likely Diagnosis • Systemic Nodal Mets • Infrahyoid (level IV) location • H&N primary SCCa more commonly levels II & III • Non-calcified • Sarcoid, DTCa often Ca++ • Central low-density/necrosis • HL, NHL, & reactive nodes usually solid, but can be low-density Use Everything at Your Disposal “I’ll tell you right now – that ain’t normal.” -- Rick Wiggins Question 2 • Which of the following is MOST suggestive of systemic nodal metastases in the neck? – A. – B. – C. – D. Enlarged suprahyoid (level I or II) node Enlarged left supraclavicular lymph node Centrally necrotic lymph node Calcification within an enlarged cervical node Question 2 • Which of the following is MOST suggestive of systemic nodal metastases in the neck? – A. – B. – C. – D. Enlarged suprahyoid (level I or II) node Enlarged left supraclavicular lymph node Centrally necrotic lymph node Calcification within an enlarged cervical node Companion Case 25-year-old man with neck mass HL with “Signal” Node • AKA Virchow node • Isolated left supraclavicular adenopathy look to the chest & abdomen for primary • Most HL patients present with neck nodes • Concurrent mediastinal nodes common • Rarely extranodal H&N disease • M>F • Peak incidence in mid-20s Question 3 • Which of the following is a TRUE statement? – A. – B. – C. – D. HL is more common than NHL Extranodal disease favors HL over NHL Imaging can reliably differentiate NHL from HL HL has an earlier peak incidence than NHL Question 3 • Which of the following is a TRUE statement? – A. – B. – C. – D. HL is more common than NHL Extranodal disease favors HL over NHL Imaging can reliably differentiate NHL from HL HL has an earlier peak incidence than NHL Case 4 • 55-year-old woman with known thyroid nodules, reportedly benign – surveillance US Longitudinal Transverse Power Doppler Prior biopsy reported benign Differential Diagnosis • Congenital lesion • • • • Lymphatic malformation Venolymphatic malformation Venous malformation 3rd Branchial cleft cyst • Neurofibroma • Schwannoma • Malignant Lymph node • Carotid artery Pseudoaneurysm Most Likely Diagnosis • Congenital lesion • Lymphatic malformation • Benign, circumscribed • No flow on US • Demonstrably separate from IJV and CCA • Venolymphatic malformation • Possible, but would have essentially no venous component • Why not a NST? Carotid Space Nerve Sheath Tumor Pros • • • • Location Size Morphology Low Density Image c/o Lauren Ladd, M.D. Cons • Echogenicity • Lack of vascularity CS Nerve Sheath Tumor Comparison Shape CS Schwannoma CS Neurofibroma Fusiform Ovoid or fusiform (***unless plexiform) Margins Circumscribed Circumscribed (***unless plexiform) Size 2 - 8 cm 2 - 5 cm M:F Male predominance Female Predominance NECT Isodense to muscle Hypodense CECT Uniform enhancement, rare low density Poorly enhancing T1WI -C Variable, no flow voids Isointense to muscle T1WI +C Marked uniform enhancement Homogeneous or patchy enhancement T2WI Very hyperintense, "target sign" Hyperintense to muscle, +/- intratumoral cysts Question 4 • Which of the following is a FALSE statement? – A. Most lymphatic malformations are diagnosed before age 2 – B. Lymphatic malformations can be acquired – C. Lymphatic malformations have no malignant potential – D. Microcystic lymphatic malformations are less likely to recur than macrocystic malformations Question 4 • Which of the following is a FALSE statement? – A. Most lymphatic malformations are diagnosed before age 2 – B. Lymphatic malformations can be acquired – C. Lymphatic malformations have no malignant potential – D. Microcystic lymphatic malformations are less likely to recur than macrocystic malformations Case 5 • 25-year-old man with enlarging neck mass, recent URI Same patient, 3 days prior Differential Diagnosis • Thyroglossal Duct Cyst • Lymphatic Malformation • Mixed Laryngocele • Necrotic Lymph Node • Abscess • Thyroid Ca Most Likely Diagnosis • Infected Thyroglossal Duct Cyst with associated FOM Abscess • Classic history • Midline/paramidline infrahyoid • Wall enhancement infected • Round or ovoid • Cyst • No calcs or solid component Thyroglossal Duct Cyst Key Points • Cystic remnant of TGD • Lesion of the young • Location • • • 20-25% = Suprahyoid 50% = Hyoid 25% = Infrahyoid • Infrahyoid typically embedded in strap muscles “claw” sign • Wall enhancement if infected • < 1% will develop Thyroid Ca Question 5 • Which of the following is a TRUE statement? – A. Thyroglossal duct cyst is the most common congenital neck mass – B. Thyroglossal duct cysts are always midline structures – C. The most common malignancy to develop in a thyroglossal duct cyst is medullary thyroid Ca – D. Treatment of thyroglossal duct cyst is typically needle aspiration Question 5 • Which of the following is a TRUE statement? – A. Thyroglossal duct cyst is the most common congenital neck mass – B. Thyroglossal duct cysts are always midline structures – C. The most common malignancy to develop in a thyroglossal duct cyst is medullary thyroid Ca – D. Treatment of thyroglossal duct cyst is typically needle aspiration TGD Cyst Companion Cases 1) 50-year-old man with neck mass TGD Cyst. High density = heme, protein. 2) Young girl, dysphagia TGD Cyst. Suprahyoid/BOT. 3) Enlarging neck mass TGD Cyst Thyroid Ca. Enhancing nodule. Coarse calc. Nodal Met. 4) Ectopic Thyroid Case 6 • 31-year-old woman with difficult intubation during elective surgery “I’ll tell you right now – that ain’t normal.” -- Rick Wiggins Ax T1WI +C FS Ax T1WI +C FS Cor T1WI +C FS Ax T2WI FS Ax T2WI FS Differential Diagnosis • NF1 • NF2 • Schwannomatosis • Laryngeal SCCa with Mets • Chondrosarcoma with Mets Ax T2WI FS Ax T1WI +C FS Most Likely Diagnosis • Schwannomatosis • Morphology & Margins • SCCa infiltrative/invasive • Distribution • CS + Brachial plexus NST • NORMAL IACs • NF2 less likely • Age • NF1 = 1st decade • NF2 = 2nd decade • Schwannomatosis = 3-4th decades • No matrix calcification • MR signal NST Question 6 • Which of the following is a TRUE statement? – A. Schwannomas grow centrally within an involved nerve – B. Schwannomatosis patients demonstrate a normal life expectancy – C. Schwannomas arise from pericytes in the nerve sheath – D. Schwannomatosis is more common than NF1 Question 6 • Which of the following is a TRUE statement? – A. Schwannomas grow centrally within an involved nerve – B. Schwannomatosis patients demonstrate a normal life expectancy – C. Schwannomas arise from pericytes in the nerve sheath – D. Schwannomatosis is more common than NF1 Schwannomatosis Key Points • Multiple nonintradermal schwannomas WITHOUT vestibular nerve involvement • Separate disease entity from NF2 – Different gene mutation • SMARCB1 vs. NF2 – Later onset • 4th decade vs. 2nd decade – Normal life expectancy (unlike NF2) – Pain >> neurologic deficits (unlike NF2) • Similar incidence to NF2 (~ 1/40,000) Infrahyoid Neck Conclusion • Several deep spaces & nodal stations – Wide variety of pathology • Look for useful discriminators: – Age – History – Deep space of origin Thanks nick.koontz@hsc.utah.edu