The description of "spindle cells arranged in small cluseters" with amyloid staining as well as the mention of C-cells (which secrete calcitonin) points to a medullary thyroid carcinoma which commonly secretes calcitonin. (FA2020 p343)
Though this was not asked and not required to answer the question, she also has a history of pheochromocytoma which points to her having one of the MEN2 syndromes, as MEN2A and MEN2B are both associated with pheochromocytoma and medullary thyroid carcinoma! (FA2020 p351)
submitted by โcassdawg(1780)
The description of "spindle cells arranged in small cluseters" with amyloid staining as well as the mention of C-cells (which secrete calcitonin) points to a medullary thyroid carcinoma which commonly secretes calcitonin. (FA2020 p343)
Though this was not asked and not required to answer the question, she also has a history of pheochromocytoma which points to her having one of the MEN2 syndromes, as MEN2A and MEN2B are both associated with pheochromocytoma and medullary thyroid carcinoma! (FA2020 p351)