EOD Primary Tumor

Notes

**Note 1:** Periosteum is a fibrous membrane that wraps the outer surface of bones. Mucoperiosteum is a compound structure of mucous membrane and periosteum. Cortical bone is the dense compact outer layer of bone. **Note 2:** Macroscopic extraparenchymal extension (code 300) is based on clinical evaluation or macroscopic evidence of extraparenchymal extension at the time of surgery.
Code Description SS2018 T
000 In situ, intraepithelial, noninvasive IS
100 Any size tumor - Invasive tumor confined to gland/duct of origin - Multiple foci confined to substance of parotid gland - Confined to parotid gland, NOS - Confined to salivary gland, NOS - Confined to submandibular gland, NOS - Localized, NOS L
200 Any size tumor - Extraparenchymal extension, NOS - Microscopic extraparenchymal extension ONLY to periglandular soft/connective tissue RE
300 Macroscopic extraparenchymal extension to periglandular soft/connective tissue Extension to another major salivary gland (parotid, sublingual, submandibular, submaxillary) Deep extrinsic muscles (submandibular gland only) - Genioglossus - Geniohyoid - Hyoglossus - Mylohyoid - Styloglossus Facial artery or vein Maxillary artery Pharyngeal mucosa (parotid gland only) Skeletal muscle - Digastric - Masseter (parotid gland only) - Pterygoid - Sternocleidomastoid (parotid gland only) - Stylohyoid RE
350 Spinal accessory nerve D
400 Ear canal External auditory meatus (parotid gland only) Mandible Mastoid/mastoid process (parotid gland only) Nerves - Auricular (parotid gland only) - Facial (7th nerve) (submandibular and salivary gland only) - Lingual (submandibular and salivary gland only) Periosteum of mandible Skin overlying gland (parotid gland only) RE
500 Structures in code 400 with spinal accessory nerve involvement OR External auditory meatus (submandibular and salivary gland only) Nerves - Facial (7th nerve) (parotid gland only) - Lingual (parotid gland only) Skin overlying gland (submandibular and salivary gland only) D
600 Internal carotid artery (encased) Jugular vein (parotid gland only) RE
700 Internal carotid artery or jugular vein with extension to structures in codes 350-500 OR Pterygoid plates Skull (base, NOS) Further contiguous extension D
800 No evidence of primary tumor U
999 Unknown; extension not stated Primary tumor cannot be assessed Not documented in medical record Death Certificate Only U
(1) Fritz AG, Ries LAG (eds). **SEER Extent of Disease 1988: Codes and Coding Instructions (3rd Edition, 1998)**, National Cancer Institute, NIH Pub. No. 98-2313, Bethesda, MD, 1998 (2) Young JL Jr, Roffers SD, Ries LAG, Fritz AG, Hurlbut AA (eds.). **SEER Summary Staging Manual-2000: Codes and Coding Instructions**, National Cancer Institute, NIH Pub. No. 01-4969, Bethesda, MD, 2001. (3) Collaborative Stage Work Group of the American Joint Committee on Cancer. **Collaborative Stage Data Collection System User Documentation and Coding Instructions, version 02.05**. American Joint Committee on Cancer (Chicago, IL) (4) Gress, D.M., Edge, S.B., Gershenwald, J.E., et al. **Principles of Cancer Staging**. In: Amin, M.B., Edge, S.B., Greene, F.L., et al. (Eds.) AJCC Cancer Staging Manual. 8th Ed. New York: Springer; 2017 (5) Lydiatt, W.M., Patel, S.G., Shah, J.P., et al. **Staging Head and Neck Cancers**. In: Amin, M.B., Edge, S.B., Greene, F.L., et al. (Eds.) AJCC Cancer Staging Manual. 8th Ed. New York: Springer; 2017 (6) Lydiatt, W.M., Shah, J.P., et al. **Major Salivary Glands**. In: Amin, M.B., Edge, S.B., Greene, F.L., et al. (Eds.) AJCC Cancer Staging Manual. 8th Ed. New York: Springer; 2017