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  • Title: [A case of occipital diploic dermoid tumor with perforation of the dura].
    Author: Isobe N, Takano M, Chikuie H, Nosaka R, Eguchi K, Kuniyasu H.
    Journal: No Shinkei Geka; 2013 Apr; 41(4):329-35. PubMed ID: 23542796.
    Abstract:
    Along with epidermoid cysts, dermoid cysts are uncommon, benign and slow-growing lesions. We described a case of diploic dermoid cyst of the occipital bone with an intracranial extension in the right posterior fossa diagnosed and subjected to pathological examination. A 63-year-old man presented with dizziness at the time of posture conversion. Magnetic resonance imaging(MRI)showed a heterogenous hypo-intensity area on T1-weighted image, hyper-intensity on T2-weighted image and remarkably-strong intensity on diffusion-weighted image. Gadolinium enhancement was partially seen in the tumor capsule. Bone density computed tomography (CT) and 3-dimensional CT using helical CT scan revealed the osteolytic range with destruction of the inner and outer table. From these findings, this tumor was diagnosed as diploic epidermoid cyst before surgery. The tumor was totally removed and underwent cranioplasty with a titanium plate. However, pathological examination confirmed dermoid cyst with existence of sebaceous gland in some cyst-walls. It was difficult to diagnose this case as dermoid tumor from radiological features before surgery.
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