‘Row of tombstones ‘ appearance is seen in
**Core Concept**
The 'row of tombstones' appearance is a histopathological term used to describe a specific pattern of tissue change. It refers to the arrangement of hyaline cartilage cells, also known as chondrocytes, in a stacked or layered manner, resembling tombstones. This appearance is typically seen in conditions affecting the cartilage.
**Why the Correct Answer is Right**
The 'row of tombstones' appearance is characteristic of degenerative joint disease, where the cartilage undergoes changes due to wear and tear. In this condition, the chondrocytes are arranged in a stacked manner, with the nuclei aligned in a vertical direction, giving the appearance of tombstones. This is due to the loss of proteoglycans and the subsequent compaction of the cartilage matrix.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the 'row of tombstones' appearance is not typically seen in inflammatory arthritis, where the cartilage damage is more diffuse and not as organized.
**Option B:** This option is incorrect because the 'row of tombstones' appearance is not a feature of osteoarthritis, where the cartilage damage is more widespread and not as localized.
**Option C:** This option is incorrect because the 'row of tombstones' appearance is not a characteristic of chondromalacia patellae, where the cartilage damage is more superficial and not as organized.
**Clinical Pearl / High-Yield Fact**
The 'row of tombstones' appearance is a classic histopathological feature of degenerative joint disease, and its recognition can help in diagnosing conditions such as osteoarthritis. It is essential to consider the overall histopathological context, including the arrangement of chondrocytes, the loss of proteoglycans, and the compaction of the cartilage matrix.
**Correct Answer: D. Osteochondritis Dissecans**