EOD-Extension--Mycosis Fungoides: Explain the difference between extension codes 25 [% of body surface not stated, no tumors] and 30 [skin involvement, NOS; extent not stated, no tumors. Localized, NOS]?
For cases diagnosed 1998-2003:
For mycosis fungoides: Use code 25 when skin involvement is present but only a general location/site is mentioned (i.e., face, legs, torso, arms).
Use code 30 when there is skin involvement but there is no mention of location/site.
CS Extension--Prostate: Can the EOD Manual clarifications regarding apparent and inapparent tumors be used to determine CS clinical extension for prostate primaries?
This answer was provided in the context of CSv1 coding guidelines. The response may not be used after your registry database has been converted to CSv2.Do not use the EOD information to determine apparent and inapparent when coding Collaborative Stage for tumors diagnosed 1/1/2004 or later.
The August 2007 CoC Flash stated that "After consultation with the AJCC curators for genitourinary disease, the CS Steering Committee has determined that the SEER list of terms for apparent and inapparent in the SEER Extent of Disease Manual is NOT to be used for interpreting reports for Collaborative Staging. While it was a convenient tool for registrars, the curators are of the opinion that the use of the list will lead to misinterpretation of reports. Rather, the curators recommend that registrars rely on a direct physician statement of apparent or inapparent disease for Collaborative Staging."
August 2007 CoC Flash: http://www.facs.org/cancer/cocflash/august07.pdf, Coding Prostate Cancer: A Message from the Collaborative Staging Steering Committee.
MP/H Rules/Histology--Thyroid: How many primaries are to be reported and what histology is to be coded for an anaplastic/undifferentiated thyroid carcinoma with sarcomatoid transformation likely arising in association with a papillary thyroid carcinoma? Thyroid contains one tumor: 12.5 cm in greatest dimension...almost completely replaces entire thryroid gland.
For cases diagnosed 2007 or later:
This is a single primary using rule M2; a single tumor is always a single primary.
The histology code for this case is 8260/3 [Papillary carcinoma of thyroid]. Begin with Histology Coding rule H8. Stop at rule H17 and code the histology with the numerically higher ICD-O-3 code.
Histology (Pre-2007)--Breast: Are diagnoses of "infiltrating duct and mucinous carcinoma" and "duct carcinoma, mucinous type" both coded to the histology code of 8523/3?
For tumors diagnosed prior to 2007:
Code "Infiltrating duct and mucinous carcinoma" to 8523/3 [Infiltrating duct mixed with other types of carcinoma] according to the instructions for coding a single tumor with complex histology in Appendix C of the 2004 SEER manual. Assign code 8523/3 when the diagnosis is duct carcinoma mixed with another type of carcinoma. Look for "and" or "mixed" in the diagnosis.
Code the Histology field for a "ductal carcinoma, mucinous type" to 8480/3 [Mucinous carcinoma].
The instructions for coding a single tumor with complex histology are to code the specific type if the diagnosis is "Duct carcinoma, _____ type."
For tumors diagnosed 2007 or later, refer to the MP/H rules. If there are still questions about how this type of tumor should be coded, submit a new question to SINQ and include the difficulties you are encountering in applying the MP/H rules.