Unilateral leg swelling in a newborn

Area of Science:

• Vascular anomalies
• Dermatology
• Neonatal care

Background:

• Vascular anomalies are common congenital conditions.
• Early diagnosis and characterization are crucial for appropriate management.
• Neonatal presentation requires careful evaluation to differentiate various subtypes.

Observation:

• A female neonate exhibited asymmetric lower limbs with an enlarged right leg.
• The affected limb displayed thickened, reddish-purple skin with ectatic superficial reticulum.
• Initial investigations, including imaging and laboratory tests, were largely unremarkable apart from transient thrombocytopenia.

Findings:

• Ultrasound revealed significant skin thickening, dermal hypertrophy, and hyperechogenicity.
• Magnetic resonance imaging demonstrated circumferential dermal thickening and hypertrophy of perforating vessels.
• Histopathological analysis of a biopsy confirmed the presence of capillary malformations.

Implications:

• This case highlights the importance of thorough clinical and imaging evaluation in neonates with limb asymmetry.
• Capillary malformations, though often benign, require accurate diagnosis to guide potential interventions.
• Understanding the imaging and histological features aids in differentiating these from other vascular anomalies.