**Core Concept**
Stippling, also known as stippled calcification, is a type of bone lesion characterized by the presence of small, discrete calcifications within the bone matrix. This phenomenon is often observed in conditions involving abnormal bone turnover or metabolism.

**Why the Correct Answer is Right**
The absence of stippling is typically seen in conditions where there is a lack of osteoblastic activity or an imbalance in bone metabolism. In the case of **Option D: Osteopetrosis**, the correct answer, stippling is absent due to the abnormal increase in bone density and reduced osteoblastic activity. This results in a characteristic "bone within a bone" appearance on radiographs.

**Why Each Wrong Option is Incorrect**
**Option A:** Osteomalacia is incorrect because stippling is often seen in osteomalacia, especially in the early stages, due to the disorganized mineralization of bone matrix.

**Option B:** Hyperparathyroidism is incorrect because stippling can be seen in hyperparathyroidism, particularly in the context of brown tumors, which are characteristic of this condition.

**Option C:** Fibrous dysplasia is incorrect because stippling is often present in fibrous dysplasia, where it can be seen as a result of the abnormal bone formation and turnover.

**Clinical Pearl / High-Yield Fact**
Stippling is an important radiological finding that can help differentiate between various bone disorders. Remember that stippling is typically associated with conditions involving abnormal bone metabolism or turnover.

**Correct Answer:** D. Osteopetrosis.