CS Extension/CS Lymph Nodes--Colon: What codes are used when large vessel invasion (V2 grossly evident) is stated to be present on a pathology report? See Discussion.
Reportability/Behavior--Colon: Is a final diagnosis of "mucosal carcinoid" of the colon reportable with a behavior code 2 [in situ] or 3 [invasive] if the microscopic description states that a "malignancy is not appreciated"? See Discussion.
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 Extension--Retinoblastoma: When the degree of extension differs between the retinas, how is extension coded for simultaneous bilateral retinoblastoma?