An official website of the United States government
Home
SEER Inquiry System - Report
Produced: 04/14/2026 4:51 AM
Question 20140009
Inquiry Details
References:
#1: ICD-O-3
#2: Solid Tumor Rules. Head & Neck
Question:
Primary site: What primary site do I assign to a Squamous Cell Carcinoma of the parapharyngeal space when there is no other info available regarding a more definitive site within the parapharyngeal space? Each physician involved with the case states the primary site is the parapharyngeal space. This is a patient who was diagosed and treated elswhere and was seen at our hospital several months later for a radical neck dissection for suspected lymph node mets.
Discussion:
Answer:
Assign C139 for a primary originating in the parapharyngeal space. This space contains part of the parotid gland, adipose tissue, lymph nodes, nerves, arteries and veins.
History:
We recommend C490 for a primary originating in the parapharyngeal space. This space contains part of the parotid gland, adipose tissue, lymph nodes, nerves, arteries and veins.
