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Tumor Tip of the Week – Cutaneous Melanoma Multiple Primary Rules

Scenario:

08-05-2021 shave biopsy left chest: Clark Level IV Melanoma

08-05-2021 shave biopsy left back: Clark Level II Melanoma

 

Question:  How will you abstract?

    • Single Primary
    • Multiple Primary

 

Answer:   Single

 

Rationale

2021 Cutaneous Melanoma Multiple Primary Rules

Rule M6 Abstract a single primary when synchronous, separate/non-contiguous tumors are on the same row in Table 2 in the

Equivalent Terms and Definitions. Tumors must:

  • Have the same site code AND
  • Have the same laterality

Note: The same row means the tumors are:

  • The same histology (same four-digit ICD-O code) OR
  • One is the preferred term (column 1) and the other is a synonym for the preferred term (column 2) OR
  • A NOS (column 1/column 2) and the other is a subtype/variant of that NOS (column 3)

Example 1: Both lesions are located on the right side of the body and sites are chest C445 and back C445. Histology for the chest lesion is melanoma, NOS (8720/3) and the back lesion is nodular melanoma (8721/3). Abstract a single primary. Refer to illustration.

Example 2: Both lesions are located on the left leg. One lesion is spindle cell melanoma (8772/3) located on the front of the left hip C447. The other lesion is spindle cell melanoma (8772/3) located on the front of the left thigh C447. Refer to illustration.

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