Final answer:
Carcinoid tumors and adrenocortical carcinomas might have lower uptake on In111.
Step-by-step explanation:
The neuroendocrine tumors that might have lower uptake on In111 are a) Carcinoid tumors and d) Adrenocortical carcinomas.
Carcinoid tumors are neuroendocrine tumors that arise from enterochromaffin cells and are found in various organs, such as the gastrointestinal tract and lungs. Adrenocortical carcinomas are tumors that arise from the cortex of the adrenal glands and are responsible for producing hormones such as cortisol, aldosterone, and androgens.
On the other hand, pheochromocytomas are tumors that arise from chromaffin cells in the adrenal medulla and are associated with high catecholamine production, which can result in increased uptake on In111.
Insulinomas are tumors that arise from the beta cells of the islets of Langerhans in the pancreas and are associated with excessive insulin production, which can also lead to increased uptake on In111.