Subgaleal hematoma may cross cranial sutures. Inexperienced clinicians may suspect CSF collection under the scalp which does not occur. Usually presents as a soft, fluctuant mass. These do not calcify.
Subperiosteal hematoma (some refer to this as cephalhematoma): most commonly seen in the newborn (associated with parturition, may also be associated with neonatal scalp monitor) 1) 2) Bleeding elevates periosteum, extent is limited by sutures. Firmer and less ballotable than subgaleal hematoma 3); scalp moves freely over the mass. 80% reabsorb, usually within 2–3 weeks. Occasionally may calcify
On certain MRI sequences also consider