Absence of sesamoid bone in girl of age about normal range of puberty is said to have:
**Core Concept**
The sesamoid bones are small, embedded bones within tendons, and their absence can have implications for the surrounding musculoskeletal structures. In the context of puberty, the sesamoid bones play a crucial role in the development and function of the hands and feet.
**Why the Correct Answer is Right**
The absence of a sesamoid bone, particularly in the case of a girl in the normal range of puberty, is a significant finding. In this context, it is likely indicative of _Turner syndrome_, a genetic disorder affecting females, characterized by the absence or abnormal development of one X chromosome. Turner syndrome is associated with various physical and developmental anomalies, including skeletal abnormalities. The absence of a sesamoid bone may be one of the subtle clues pointing towards this diagnosis.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not relevant to the context of sesamoid bone absence and puberty. While joint diseases can affect the musculoskeletal system, they do not explain the specific absence of a sesamoid bone in a girl at puberty.
* **Option B:** Osteogenesis imperfecta is a genetic disorder affecting bone development, leading to fragile bones and skeletal deformities. However, it does not specifically explain the absence of a sesamoid bone in the context of puberty.
* **Option C:** This option is unrelated to the context of sesamoid bone absence and puberty. While certain infections or inflammatory conditions can affect the musculoskeletal system, they do not explain the specific absence of a sesamoid bone in a girl at puberty.
**Clinical Pearl / High-Yield Fact**
Turner syndrome is a sex chromosome disorder characterized by the absence or abnormal development of one X chromosome, affecting approximately 1 in 2,500 females. It is essential to recognize the subtle clues, such as the absence of a sesamoid bone, that may point towards this diagnosis.
**Correct Answer:** D.