In sipple syndrome [MEN II ) all are present except:
**Core Concept**
Sipple syndrome, also known as Multiple Endocrine Neoplasia Type 2A (MEN 2A), is a rare genetic disorder characterized by the occurrence of medullary thyroid carcinoma, pheochromocytoma, and primary hyperparathyroidism. It is caused by mutations in the RET proto-oncogene.
**Why the Correct Answer is Right**
The correct answer is that all the options listed are present in Sipple syndrome. The RET proto-oncogene mutation leads to the development of medullary thyroid carcinoma, which is a type of thyroid cancer. Pheochromocytoma is a tumor of the adrenal gland that secretes excess catecholamines, leading to hypertension and other symptoms. Primary hyperparathyroidism is caused by the overproduction of parathyroid hormone, which can lead to hypercalcemia.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not a characteristic of Sipple syndrome. Instead, it might be a feature of Multiple Endocrine Neoplasia Type 1 (MEN 1), which includes tumors of the parathyroid glands, pituitary gland, and pancreas.
**Option B:** This option is not a feature of Sipple syndrome. It might be a characteristic of Multiple Endocrine Neoplasia Type 1 (MEN 1) or other syndromes.
**Option C:** This option is not a feature of Sipple syndrome. It might be a characteristic of other syndromes, such as Multiple Endocrine Neoplasia Type 2B (MEN 2B), which includes marfanoid habitus, mucosal neuromas, and gastrointestinal ganglioneuromatosis.
**Clinical Pearl / High-Yield Fact**
It is essential to remember that Sipple syndrome is caused by mutations in the RET proto-oncogene, and patients with this syndrome are at an increased risk of developing medullary thyroid carcinoma, pheochromocytoma, and primary hyperparathyroidism. Regular screening and early detection are crucial for the management of these patients.
**Correct Answer: A.**