A 26 year old pregnant woman presents with ahritis and a malar rash which worsens exposed to sunlight. She has a low-grade fever fever and is admitted to the hospital. What is the likely diagnosis:
**Core Concept**
This question tests the student's knowledge of autoimmune disorders and their clinical manifestations during pregnancy. The underlying principle is the recognition of a specific autoimmune condition characterized by arthritis, malar rash, and photosensitivity.
**Why the Correct Answer is Right**
The patient's symptoms, particularly the malar rash and photosensitivity, are highly suggestive of Systemic Lupus Erythematosus (SLE). SLE is an autoimmune disease that can affect multiple organs, including the skin, joints, and kidneys. During pregnancy, SLE can flare up due to hormonal changes, leading to increased inflammation. The low-grade fever is also consistent with SLE, which often presents with fever as a systemic symptom. The disease is caused by the production of autoantibodies against various cellular components, leading to inflammation and tissue damage.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the clinical presentation described. The patient's symptoms do not suggest an infection or sepsis.
**Option B:** This option is incorrect because the patient does not have a history of trauma or injury, and the symptoms do not suggest a musculoskeletal disorder.
**Option C:** This option is not consistent with the patient's clinical presentation. The malar rash and photosensitivity are not typical of rheumatoid arthritis.
**Clinical Pearl / High-Yield Fact**
In patients with SLE, the disease activity often increases during pregnancy due to hormonal changes, particularly the increase in estrogen levels. This can lead to flares of the disease, making it essential to monitor patients closely during pregnancy.
**Correct Answer:** C. Systemic Lupus Erythematosus (SLE)