Pharyngeal Arches, Chapter 1: Normal Development and Derivatives.

The pharyngeal arches form the cornerstone of the complex anatomy of the face and neck. These embryologic structures are the foundation of face and neck development, and anomalous growth can result in craniofacial abnormalities. Surgeons who manage head and neck pathology and pathoanatomy will invariably encounter conditions associated with aberrant pharyngeal arch anatomy, and a thorough understanding of the normal and pathological development of these important structures is paramount to accurate diagnosis and treatment. This manuscript is the first of a three-part educational series that addressed the pharyngeal/branchial arch embryology, development, nomenclature, and normal anatomy (Part I), pathologic anomalies of ear and neck derived from abnormal development of the arches (Part II), and different types of orofacial clefts, including Tessier clefts (Part III).

Iatrogenic Calcinosis Cutis in the Pediatric Patient: Case Report and Literature Review.

Calcinosis cutis is the term used to describe the deposition of calcium compounds within the skin and subcutaneous tissue, which can occur after the administration of intravenous calcium compounds. Its etiology is broad, and the clinical presentation is variable, creating a diagnostic challenge. Although iatrogenic calcinosis cutis is extremely uncommon, awareness and early diagnosis of this entity can reduce the risks of severe complications, including soft tissue damage, restricted joint mobility, and even nerve compression. Clinical suspicion should prompt a thorough review of the medical history and appropriate radiographic studies. Evidence of extensive soft tissue calcification must be present on radiographic imaging to confirm the diagnosis. Iatrogenic calcinosis cutis is managed conservatively, and resolution of symptoms is expected within 2 months of symptom onset. Herein we report the case of an infant with DiGeorge syndrome who developed iatrogenic calcinosis cutis after receiving an intraoperative infusion of calcium gluconate. Our patient presented with right lower extremity swelling, erythema, and warmth over a broad area of the leg centered on the entry point of the venipuncture. This was initially mistaken and managed as cellulitis, but once an accurate diagnosis was made, the symptoms gradually resolved with conservative care and no functional sequelae. We also present the literature on iatrogenic and idiopathic calcinosis cutis in the pediatric population.