**Question:** Radiological findings of scurvy are A/E:

A. Enlargement of submandibular lymph nodes
B. Increased osteopenia
C. Pulmonary tuberculosis
D. Dental caries

**Core Concept:**
Scurvy is a vitamin C deficiency disease that primarily affects connective tissues, leading to impaired collagen synthesis and fibrous degeneration. Vitamin C is essential for the hydroxylation of lysine and proline residues in procollagen molecules, which are crucial for cross-linking collagen fibers and maintaining their strength and integrity.

**Why the Correct Answer is Right:**
Radiological findings in scurvy generally reflect the impaired collagen synthesis and fibrous degeneration in the body. In this case, increased osteopenia (reduced bone density) is the correct answer, as vitamin C deficiency can lead to impaired collagen deposition in the bone matrix, resulting in reduced bone density and increased susceptibility to fractures.

**Why Each Wrong Option is Incorrect:**
A. Enlargement of submandibular lymph nodes is not a common finding in scurvy. While vitamin C deficiency can cause generalized lymph node enlargement, submandibular lymph nodes are not typically involved.
B. Osteopenia indicates reduced bone density, which is a consequence of scurvy, but it is not specific to scurvy alone. Other diseases, such as osteoporosis and chronic kidney disease, can also cause decreased bone density.
C. Pulmonary tuberculosis is an infectious disease affecting the lungs, whereas scurvy primarily affects connective tissues throughout the body. These two conditions are unrelated.
D. Dental caries (tooth decay) is a result of bacterial infection and poor oral hygiene, not a consequence of vitamin C deficiency.

**Clinical Pearl:**
Vitamin C deficiency can lead to various clinical manifestations, including gum hemorrhages, joint pain, fatigue, and impaired wound healing. However, the correct answer is osteopenia, as it highlights the impact of scurvy on the skeletal system, which is a crucial organ affected by vitamin C deficiency. This explanation helps students understand the importance of vitamin C in bone health and the significance of osteopenia as a radiological finding in scurvy. While the other options are incorrect, they serve as helpful mnemonic devices for the students to remember the distinct clinical features of scurvy.