Subgaleal hematoma refers to accumulation of blood in the subgaleal aponeurosis beneath the subcutaneous tissue of the scalp. It is usually found in newborn who are delivered via vacuum-assisted vaginal delivery. However, it can also occur in trauma patients and it can overlie the skull fracture. Reference: https://pubmed.ncbi.nlm.nih.gov/28941556/#:~:text=Background%3A%20Subgaleal%20hematoma%20(SGH),and%20hair%20braiding%20or%20pulling. Image via: https://radiopaedia.org/cases/extensive-subgaleal-haematoma