Primary Site: For malignant gastrointestinal tumors (GISTs), how should the primary site be coded and which Collaborative Stage and TNM staging schemes should be used for disease found in the stomach, small intestine or other locations?
Primary Site/CS Extension--Lymphoma: Should CS Extension be coded to 22 [Involvement of spleen PLUS lymph node(s) BELOW the diaphragm] or 32 [Involvement of spleen PLUS lymph node(s) on both sides of the diaphragm] for the biopsy proven lymphoma in a retroperitoneal mass and a CT of the chest with nodes described as "indeterminate" or "calcified"? See Discussion.
CS Tumor Size--Lung: If a 5/11/07 CT showed a 6.5 cm LLL mass and a 7/24/07 CT showed 8.4 cm LLL mass, do we code the larger tumor size identified within four months of diagnosis or do we code the first size documented at the time of diagnosis?
CS Tumor Size--Unknown & ill-defined site: For an unknown primary site, should this field be coded to 000 [No mass/tumor found] or 999 [Unknown; size not stated; not stated in patient record]?
CS Lymph Nodes--Melanoma: If the primary site is coded to C449 because no primary skin lesion is identified for a melanoma case, are any positive lymph nodes assumed to be regional?
CS Site Specific Factor 6--Breast: Should we assume that the invasive portion of the tumor is being referred to when a pathologist provides only a single tumor size but includes both invasive and in situ descriptors when discussing the size of that tumor? See Discussion.
CS Reg LN Pos/Exam--Melanoma: How should these fields be coded for a case that is an unknown primary site melanoma with liver involvement and a positive axillary lymph node?
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