**Tabes Dorsalis Features**

**Core Concept**
Tabes dorsalis is a late manifestation of neurosyphilis characterized by degeneration of the posterior columns of the spinal cord, leading to sensory ataxia and other neurological symptoms. This condition is caused by the bacterium *Treponema pallidum* and is a result of untreated or inadequately treated syphilis.

**Why the Correct Answer is Right**
Tabes dorsalis is associated with symptoms such as ataxia, loss of proprioception, and lightning pains due to the degeneration of the posterior columns of the spinal cord. The posterior columns are responsible for transmitting sensory information related to proprioception, vibration, and fine touch. The degeneration of these pathways leads to the characteristic symptoms of tabes dorsalis.

**Why Each Wrong Option is Incorrect**
**Option A:** Romberg's sign is a feature of tabes dorsalis, indicating a lack of proprioception and increased risk of falling when the patient stands with their feet together.
**Option B:** Loss of deep tendon reflexes is not a characteristic of tabes dorsalis; in fact, deep tendon reflexes are often hyperactive in this condition due to the involvement of the dorsal roots.
**Option C:** Gait disturbances, including ataxia and swaying, are indeed features of tabes dorsalis, resulting from the loss of proprioception and balance.

**Clinical Pearl / High-Yield Fact**
It is essential to note that tabes dorsalis often presents with a characteristic "stomping gait" or "magnetic gait," where the patient takes large, irregular steps.

**Correct Answer: B. Loss of deep tendon reflexes is not a characteristic of tabes dorsalis.**