Solid Tumor Rules (2018)/Histology--Lung: Can the stated histology from a biomarker/immunohistochemistry (IHC) report be used for coding histology? See Discussion.
Primary site--Unknown & ill-defined site/Kidney: How should this field be coded when humeral metastases are compatible with renal cell carcinoma pathologically, no kidney lesion is found clinically and the physician's signout diagnosis is "no primary found, as of now unknown"? See Description.
Solid Tumor Rules/Histology--Thyroid: What is the correct histology code for the following thyroid primary with multiple tumors abstracted as one primary diagnosed prior to 2021? See Discussion.
Surgery of Primary Site--Breast: How is this field coded when a patient has a reduction mammoplasty (for macromastia) and within the pathology specimen there is an incidental finding of carcinoma?
Solid Tumor Rules (2018)/Histology--Brain: How is histology coded for a left frontal lobe mass when the final diagnosis is malignant neuroglial tumor and the diagnosis comment describes multiple possible histologies? See Discussion.
MP/H Rules/Histology--Lung: What is the correct histology code for an initial biopsy of non-small cell carcinoma with neuroendocrine phenotype, possible large cell neuroendocrine carcinoma with a subsequent re-biopsy showing poorly differentiated small cell carcinoma after chemotherapy with no response? See discussion.
Update to current manual/Solid Tumor Rules (2018)/Histology--Lung: What is the histology code and what M Rule applies when there are multiple specific subtypes identified using various equivalent lung terms but only one is stated to be predominant? See Discussion.
MP/H Rules/Histology--Breast: What histology code and MP/H Rule applies to the Histologic Type of "invasive ductal carcinoma with metaplastic stroma" for a single breast tumor? See Discussion.
Histology (Pre-2007)--Breast: What code is used to represent the histology "Ductal carcinoma in situ; 6 mm focus of invasion is a pure mucinous carcinoma that appears to have arisen in the background of encysted papillary carcinoma."
Solid Tumor Rules/Histology--Thyroid: What is the correct histology code for a papillary carcinoma, encapsulated with columnar cell features? See Discussion.
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