Epidermoid cyst in Child
L72.0 – Epidermal cyst
419893006 – Epidermoid cyst
Differential Diagnosis & Pitfalls
Cyst rupture with associated inflammation is often misdiagnosed as an "infection" of the cyst. Cultures are usually negative, and treatment with antibiotics is not required.
Superficial lymph nodes are palpated within the subcutaneous fat and are found within the course of lymphatics.
- Lipomas are soft, mobile subcutaneous nodules with normal overlying epidermis.
- Pilar cysts (trichilemmal cysts) may be clinically indistinguishable from epidermoid cysts but are more common in childhood and are typically found on the scalp.
- Pilomatricoma usually presents as a solitary skin-colored to faint blue nodule, frequently found on the head or upper trunk in children. Firmness is a reflection of calcification within this benign tumor.
- Steatocystomas occur as asymptomatic single or multiple cysts on the chest, axillae, and/or groin that may drain an oily substance if punctured. Multiple steatocystomas are seen in some patients with pachyonychia congenita.
- Dermoid cysts result from anomalies in embryonic closure zones. Surgical removal or biopsy of a cyst over the midline should not be attempted without proper imaging to rule out intraspinal or intracranial connection.
- Thyroglossal duct cysts present as midline cystic nodules on the neck in children.
- Branchial cleft cysts present in the second or third decade as a nodule in the preauricular area, mandibular region, or along the anterior border of the sternocleidomastoid muscle.
- Bronchogenic cysts are most frequently found in the suprasternal notch, and they represent sequestered respiratory epithelium during embryological development.