In the first article in this series, we reviewed cutaneous ultrasound and its benefits and limitations as a noninvasive diagnostic tool in the pediatric setting. The sonographic findings of lumps and bumps and inflammatory conditions were discussed. In this second article, we review ultrasonographic findings of developmental anomalies and vascular lesions.
| DE VELOPMENTAL ANOMALIE S
| Cutaneous markers of dysraphismWell-recognized cutaneous markers of cranial dysraphism include the hair collar sign (HCS) (Figure 1), congenital hair tuft of the scalp (HTS), 1 large areas of aplasia cutis congenita (> 5 cm) 2 (Figure 2), and midline dermoid cyst. When these findings are present, a cerebral magnetic resonance imaging (MRI) is indicated. 1,3 Similarly, in the lumbosacral area, lipoma, infantile hemangioma greater than 2.5 cm (Figure 3), dermoid cyst or dermal sinus, aplasia cutis, acrochordon, and pseudotail or true tail are considered high-risk cutaneous markers of occult spinal dysraphism, and MRI is mandatory. For intermediate-risk cutaneous markers of spinal dysraphism such as atypical dimple, infantile hemangioma smaller than 2.5 cm, and hypertrichosis, ultrasonography is recommended in patients younger than 6 months and MRI in older patients. 3 High-frequency ultrasongraphy (HFUS) might be a helpful adjunct when approaching cutaneous markers of dysraphism, allowing assessment during the first visit, avoiding sedation and diagnostic delay, and helping to triage the urgency of further management. It can identify a range of pathologies including bone defects (Figure 2), cephaloceles, 4 atretic cephaloceles, 5,6 brain tissue heterotopia, sinus pericranii (Figure 2), as well as dermoid cysts, and their potential extension to underlying intracranial structures (Figure 3).There are few descriptions of the sonographic appearance of aplasia cutis congenita. It appears as a focal thinning of the dermis and, sometimes, of the subcutis. 7 When involving the underlying bone (20%-30% of the cases), 8 a discontinuation of the hyperechoic thick line representing the skull is detected (Figure 2). We have observed increased echogenicity in the upper part of the hypodermis immediately underlying the defect, possibly subsequent to a cicatricial process (Figure 1). Bullous aplasia cutis shows a superficial anechoic area, with a convex thin roof.
| Dysraphisms and sinus pericraniiA cephalocele consists of a herniation of meningeal and/or neuroglial tissue through a congenital cranial defect. Clinically, it Abstract High-frequency ultrasonography represents a promising tool for pediatric dermatologists. It is a noninvasive and harmless diagnostic technique that is especially appealing when working with children. It can be easily performed at the patient's bedside, avoiding diagnostic delays, sedation, or multiple visits. It represents a useful adjunct to clinical examination and aids our understanding of cutaneous pathology. In this second part, we describe the ultrasonographic findings of developmental anomalies and vascular lesion...