A newborn infant has multiple hemorrhagic, cutaneous lesions and does not respond to sound stimuli. Head CT scan shows periventricular calcifications. Which of the following infectious agents is the most likely cause of this child’s presentation?
## **Core Concept**
The clinical presentation described suggests a congenital infection, likely a TORCH (Toxoplasmosis, Rubella, Cytomegalovirus, and Herpes simplex) infection. These infections can cause a range of systemic and neurological symptoms, including cutaneous lesions, hearing impairment, and characteristic imaging findings such as periventricular calcifications.
## **Why the Correct Answer is Right**
The correct answer, **C. Cytomegalovirus (CMV)**, is the most likely cause given the combination of symptoms:
- **Cutaneous lesions and hemorrhagic manifestations** can occur due to the direct effect of the virus on the skin and the coagulation system.
- **Lack of response to sound stimuli** suggests hearing impairment, which is a known complication of congenital CMV infection.
- **Periventricular calcifications** on the head CT scan are highly suggestive of congenital CMV infection. CMV is known to cause periventricular calcifications, along with other findings like ventricular enlargement and cerebral atrophy.
## **Why Each Wrong Option is Incorrect**
- **Option A: Toxoplasmosis** can cause congenital infection with similar symptoms, including calcifications. However, the calcifications in toxoplasmosis are typically more scattered throughout the brain rather than being specifically periventricular.
- **Option B: Rubella** can cause congenital rubella syndrome, which includes hearing loss and skin lesions. However, it less commonly causes the specific pattern of periventricular calcifications seen with CMV.
- **Option D: Herpes simplex** can cause neonatal infection with skin, eye, and mouth lesions, as well as neurological symptoms. However, periventricular calcifications are not a hallmark of herpes simplex infection.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that congenital CMV infection is a leading cause of non-genetic hearing loss and neurodevelopmental delay in children. It can present with a variety of symptoms, including petechiae (which could be described as hemorrhagic cutaneous lesions), hearing loss, and specific radiographic findings like periventricular calcifications.
## **Correct Answer:** . **C. Cytomegalovirus**