====== Subgaleal hematoma etiology ======

[[Subgaleal hematoma]] most commonly occurs after [[vacuum assisted delivery]], but may also be seen following [[head trauma]]. 

The [[etiology]] of [[subgaleal hematoma]] includes [[mild traumatic brain injury]], [[vacuum assisted delivery]], [[contusion]], and [[hair]] braiding or pulling.

SGH is an uncommon phenomenon that is caused by tearing of the [[emissary vein]]s in the loose areolar tissue located beneath the [[galea]]l aponeurosis
((Chen CE, Liao ZZ, Lee YH, Liu CC, Tang CK, Chen YR. Subgaleal Hematoma at the Contralateral Side of Scalp Trauma in an Adult. J Emerg Med. 2017 Nov;53(5):e85-e88. doi: 10.1016/j.jemermed.2017.06.007. Epub 2017 Sep 20. PMID: 28941556.)).




May occur without bony trauma, or may be associated with linear nondisplaced skull fracture (especially in age < 1 yr).