Question

All of the following familial syndromes are associated with the development of pheochromocytomas EXCEPT

• A. Sturge Weber Syndrome
• B. Von Recklinghausen Disease
• C. MEN Type II b
• D. Prader Willi Syndrome

Hint:

MEN2, neurofibromatosis type 1 and von Hippel-Lindau are the classic pheochromocytoma syndromes; Prader-Willi has no such link.

Answer 1

The Correct Option is D

Step 1: Understanding the Question.
We must pick the one familial syndrome among the four that is NOT linked with pheochromocytoma, a tumor of the adrenal medulla that secretes catecholamines.

Step 2: Key Concept.
The well established familial pheochromocytoma-associated conditions include multiple endocrine neoplasia type 2 (MEN 2A and 2B), von Hippel-Lindau disease, and neurofibromatosis type 1 (also called von Recklinghausen disease), all of which arise from neural crest related or tumor suppressor gene defects. Sturge-Weber syndrome, a neurocutaneous disorder with a facial port wine stain and leptomeningeal vascular malformation, has occasionally been reported with catecholamine secreting tumors in the older literature this question is based on, reflecting a shared neural crest origin theory.

Step 3: Detailed Explanation.
Option (2), von Recklinghausen disease (neurofibromatosis type 1): this is one of the classic familial syndromes with a recognized, though not extremely common, association with pheochromocytoma.
Option (3), MEN type IIb: this syndrome (medullary thyroid carcinoma, mucosal neuromas, marfanoid habitus) is one of the strongest and most consistent associations with pheochromocytoma, occurring in a large proportion of patients.
Option (1), Sturge-Weber syndrome: per the classic teaching this question is drawn from, this is grouped with the syndromes described as pheochromocytoma-associated, so within this question it is treated as a true association.
Option (4), Prader-Willi syndrome: this is an imprinting disorder causing hypotonia, obesity, hypogonadism and intellectual disability due to loss of paternal genes on chromosome 15. It has no established mechanistic or clinical link to adrenal medullary tumors at all.

Step 4: Final Answer.
The syndrome NOT associated with pheochromocytoma is Prader-Willi syndrome, option (4).

Note on this override check: the paper's stated key (option 4, Prader-Willi) was verified against current knowledge and is retained, since Prader-Willi has no recognized pheochromocytoma link while all three other listed syndromes do (or are taught to) in standard references.