Revisiting sinking skin flap syndrome: a series of case reports and literature review on cranioplasty with PEEK implants.

Sinking Skin Flap Syndrome(SSFS) is a rare and specific complication following decompressive craniectomy(DC). Another condition, known as syndrome of the trephined(ST), shares many similarities in clinical symptoms and signs with this condition, yet they are fundamentally different. Therefore, they should be considered as two distinct diseases, and their respective concepts should not be used interchangeably as synonyms. Due to a lack of understanding of ST and SSFS, many existing clinical studies often conflate their concepts. Our study further explores and understands the clinical symptoms and radiological features of this condition through typical cases, thereby aiding in the diagnosis and treatment of such diseases.