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SEER Inquiry System - Report
Produced: 10/19/2025 1:33 AM
Question 20091115
Inquiry Details
References:
2007 SEER Manual, C-566. Appendix C
Question:
MP/H Rules/Multiple primaries - - Melanoma: How many primaries are reported when a patient presents with a malignant melanoma (NOS) and a separate lentigo maligna, both on right chest? See Discussion.
Discussion:
MP/H rule M5 states that melanomas with ICD-O-3 histology codes that are different at the third number are multiple primaries. However, the 2007 MP/H fundamentals Webcast session on melanoma rules states that this is not two histologic types. Lentigo maligna is a growth pattern, not a histologic type. Will clarification be included in the next MP/H rules revision?
Answer:
For cases diagnosed 2007 or later, two primaries are to be reported for this case. Rule M5 applies because there is a difference in the histology codes at the third digit.
Clarifications regarding histologic types of melanoma will be added to the rules when they are revised.
Cancer Site Category:
Melanoma
Data Item Category:
N/A
Other Category:
Multiple primaries
Year:
2009
