**Core Concept**
Rokitansky protuberances, also known as Rokitansky nodules, are a type of skin lesion associated with a rare congenital disorder. They are characterized by the presence of epithelial-lined cysts or sacs, which are usually filled with a clear fluid. This condition is often linked to other anomalies, particularly involving the genitourinary system.

**Why the Correct Answer is Right**
Rokitansky protuberances are a hallmark feature of vaginal adenosis, a condition where there is an abnormal presence of glandular epithelium in the vagina. This is often seen in cases of vaginal agenesis or Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome. The pathogenesis is thought to involve the failure of the Müllerian ducts to properly develop during embryogenesis. As a result, the vaginal epithelium is replaced by glandular tissue, giving rise to Rokitansky protuberances.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Rokitansky protuberances are not typically associated with other types of skin lesions, such as epidermal cysts or keratoacanthomas.
**Option B:** This option is incorrect because while Rokitansky protuberances may be associated with genitourinary anomalies, they are not a feature of renal dysplasia or other renal disorders.
**Option C:** This option is incorrect because Rokitansky protuberances are not a characteristic feature of ectopic pregnancy or other conditions involving the female reproductive tract.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that Rokitansky protuberances are often associated with vaginal agenesis or MRKH syndrome, and patients may present with primary amenorrhea and other genitourinary anomalies.

**Correct Answer: D.**