Case Example 8 (Multiple Primary and Histology)

11/24: Bone marrow aspirate, Acute monocytic leukemia (per Heme DB, primary site C421)

12/24: Left ring finger, debridement: Myeloid sarcoma (Chloroma)

Involvement Comments
Lymph nodes N/A
Organ involvement Left finger
Common metastatic sites N/A

Coding of the case (HemeRetic schema)

Data Item Coding
M Rule M3. Single histology
A myeloid sarcoma following a diagnosis of Acute Myeloid Leukemia is the same primary. The myeloid sarcoma is a sign of progression, or advanced disease, and is not abstracted as a new primary
PH Rule PH5: Acute monocytic leukemia (Code the AML histology)
Primary site C421 (Per Heme DB)
Histology 9891/3: Acute monocytic leukemia
Diagnostic confirmation 1 (positive histology)
EOD Primary Tumor 800 (leukemias always 800)
EOD Regional Nodes 888 (not applicable)
EOD Mets 88 (not applicable)
Summary Stage 7 (leukemias always distant)
Mets at Dx Data Items (all 6) 8 (not applicable)

Updated: December 2, 2025