Intraparenchymal Hemorrhage after Cranioplasty in a Patient with Sinking Flap Syndrome.

Decompressive craniectomy has been increasingly used in recent decades for the treatment of uncontrollable intracranial hypertension caused by trauma, malignant strokes, cerebral venous thrombosis, among others. Sinking flap syndrome (SFS) is a rare complication characterized by neurological deterioration after craniectomy. Here, we report the case of a 73-year-old female patient who presented with disorientation, lip rhyme deviation to the right and left hemiparesis after cardiac catheterization. In view of the presence of a malignant stroke, as well as the willingness of the family members to make a total investment to save the patient's life, decompressive hemicraniectomy was indicated. Subsequently, due to occasional headache attacks, nausea and vomiting, in addition to progressive depression of the subcutaneous flap, the possibility of SFS was suggested and cranioplasty was indicated, which occurred without perioperative intercurrences. Although the patient maintained a stable neurological status, a post-surgical computed tomography (CT) scan of the head showed a right intraparenchymal hemorrhagic lesion, associated with parenchymal expansion and midline deviation. To the best of our knowledge, intraparenchymal hemorrhages are not common complications after performing cranioplasty, and additional studies are needed to understand the reasons why this occurs. The mechanisms responsible for this type of injury are not well understood, but involve reperfusion damage and loss of brain compliance. Despite representing an uncommon complication, post-cranioplasty hemorrhage can cause severe morbidity to the patient, and early diagnosis and intervention are of great importance in these cases.