Posterior cranial fossa mature cystic teratoma, appears hyperdense on CT ( PACS images not available) which is likely secondary to saponification, microcalcifications, and blood products1.
The lesion, its stalk, and the portion of the skin attached to the stalk of the lesion were all completely removed during the patient's suboccipital craniotomy.
The lesion's final histology revealed that it was a mature teratoma without a malignant component. It consists of multiple light brown to pale yellow rubbery tissue pieces and had eosinophilic proteinaceous material with cholesterol cleft. Its wall consists of firm tissue pieces with nodular bony tissue. Microscopically cyst wall lined by stratified squamous epithelium with underlying skin appendages.