SEER Inquiry System - View
Source 1: ICD-O-3
MP/H Rules--Head & Neck: Parotid gland MASC (Mammary Analogue Secretory Carcinoma). This histology is not listed in ICD-O-3. Should we code as 8550/3 or 8502/3? Our pathologist said "that MASC is a recently descibed salivary gland tumor type which as the name implies resembles secretory carcinoma of the breast."
Assign code 8502/3.
8550 ONLY describes acinar carcinoma, a very typical type of salivary gland tumor. Using 8550 for this case would not adequately describe the histology -- you lose the special description that includes the secretory carcinoma and the indication that it is similar to mammary cancer. Both of these elements are captured in 8502/3.