Multiplicity Counter/Type of Multiple Tumors--Breast: How are these data items coded for a single breast primary composed of both in situ and invasive disease when measurements are provided for both the invasive and in insitu components? See Discussion.
Breast cancer, invasive duct carcinoma with DCIS, 1.3 cm, DCIS 3.7 cm. "The in situ carcinoma is very extensive in this lumpectomy. It is present contiguously from sides 1A through 1L sparing only the final 8 mm of medial margin. In situ and invasive carcinoma are prominently present along almost the entire superior margin." Is the mult counter 02 with Type of mult tumor 30, or one tumor?
Because there are individual measurements for each of these tumors, code the multiplicity counter 02 [Two tumors present]. Code Type of Multiple Tumor as 30 [In situ and invasive].
Primary Site--Unknown & ill-defined site: Should the primary site be coded to C809 [Unknown primary site] or C761 [Thorax, NOS] if the patient died following a limited work-up that included on a cytology on pericardial fluid that was positive for poor differentiated adenocarcinoma?
Based on the information provided, code the primary site to C809 [Unknown primary site]. There is not enough information provided to suggest that the primary site is the thorax or any other location.
Surgery of Primary Site--Ovary: How should this field be coded for an ovarian primary when there is a BSO and only the fundus of uterus is removed (not a full hysterectomy)?
Assign surgery code 52 [Bilateral (salpingo-) oophorectomy; WITH hysterectomy]. Code 52 does not exclude a partial hysterectomy.
Histology--Corpus uteri: Because coding a pathology final diagnosis of "serous carcinoma" for an endometrial primary to 8441/3 triggers the site/histology error in the SEER Edits, should histology be coded to 8010/3 [Carcinoma, NOS] instead?
Assign histology code 8441 [serous carcinoma] and override the edit. Endometrium with serous carcinoma is NOT one of the "impossible" site / histology combinations.
Solid Tumor Rules/Histology--Fallopian Tube: How is histology coded for a high-grade serous carcinoma with admixed yolk sac tumor of the right fallopian tube? See Discussion.
There was a single right fallopian tube tumor with two distinct morphologies. The diagnosis comment states, “The combined morphologic and immunohistochemical features are best classified as primary fallopian tube high grade serous carcinoma with a somatically derived yolk sac tumor.”
Assign high-grade serous carcinoma of the fallopian tube (8461/3). There is currently no code to capture this rare mixed histology. Yolk sac tumors rarely occur in the fallopian tubes of postmenopausal patients and are associated with poor outcome. It is important to document the findings in the appropriate text field.
MP/H Rules/Primary Site--Bladder: How is the primary site coded when a patient is diagnosed with synchronous, non-invasive papillary urothelial carcinomas of the bladder and renal pelvis? See Discussion.
This patient was diagnosed with at least three non-invasive papillary urothelial carcinomas of the bladder in 11/09. The patient subsequently underwent a complete nephroureterectomy in 12/09 showing a single non-invasive papillary urothelial carcinoma of the renal pelvis.
Per the MPH Rule M8, this is a single primary. Is the primary site to be coded C659 [renal pelvis] or C689 [urinary system, NOS]?
Assign code C68.9 when multiple tumors are found in multiple urinary sites at the same time.
Primary site--Bladder: What is the appropriate subsite for "adjacent to the bladder neck"?
Assign code C679 [Bladder, NOS]. It is not possible to determine the location of the tumor from the description. A tumor that is "adjacent to bladder neck" could be located in the trigone or on the bladder wall (anterior, posterior or lateral).
Primary Site--Pancreas: Should tumors with the histology "islet cell carcinoma" be coded C25.4 [Islet of Langerhans] even though the tumor location is stated to be in head of pancreas?
Assign code C25.4 [Islets of Langerhans...Endocrine pancreas]. Islet cell carcinoma of the pancreas is a tumor of the endocrine pancreas. Although Islet cells are present throughout the pancreas, the best code is C25.4 to distinguish endocrine from exocrine cancers.
Multiplicity Counter: Should this field be coded to 99 for cases of familial adenomatous polyposis (FAP)? See Discussion.
The MP/H rules state to abstract these cases as a single primary. The Type of Multiple Tumors Reported as One Primary field is coded as a single primary with a value of 32 (FAP with carcinoma), but the Multiplicity Counter seems to be unknown.
Assign code 99 [Multiple tumors present, unknown how many] for cases of FAP when the number of tumors is not stated.
Histology--Head & Neck: How do you code histology for a myofibroblastic sarcoma of the soft tissue of the head and neck?
Assign code 8825/3 [Myofibroblastoma, malignant]. According to the WHO Classification of Soft Tissue Tumors, "Low grade myofibroblastic sarcoma represents a distinct atypical myofibroblastic tumor often with fibromatosis-like features and predilection for the head and neck." Also called myofibrosarcoma.
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