Which disorder is NOT associated with hypothalamic dysfunction?

Hypothalamic dysfunction is typically characterized by a range of disorders that directly involve the hypothalamus or its regulatory functions. Prader-Willi syndrome and Lawrence-Moon-Biedl syndrome are both genetic disorders affected by hypothalamic dysfunction. In Prader-Willi syndrome, one of the hallmark features is hyperphagia due to the hypothalamus's inability to regulate appetite and satiety correctly. Lawrence-Moon-Biedl syndrome involves obesity as well, which is also linked to hypothalamic dysregulation.

Leptin mutations can cause problems with energy regulation and body weight as leptin is a hormone produced by adipose tissue that signals to the hypothalamus to regulate appetite and energy expenditure. A mutation in the leptin pathway leads to dysfunction in this regulatory mechanism, confirming its association with hypothalamic issues.

In contrast, a pituitary infarct, while it may have secondary effects on the hypothalamus, primarily affects the pituitary gland, which is responsible for hormone production and secretion. The dysfunction primarily arises in the pituitary gland itself rather than the hypothalamus. Therefore, it does not directly associate with hypothalamic dysfunction as the other options do. Hence, this option is correctly identified as the one not