"Epidermoid cysts are usually congenital (arising from ectodermal inclusion during neural tube closure 8) and sometimes acquired (post-surgical or post-traumatic implantation). They consist of an external layer of ectoderm-derived squamous epithelium and internal desquamated keratin debris. Dermoid cysts are also derived from ectodermal elements; the difference between epidermoid and dermoid cysts is that the latter also contain epidermal appendages. In contrast, teratomas are a type of neoplasm (epidermoid and dermoid cysts are non-neoplastic) that contain tissues from at least two of the three somatic tissue lines (these being ectoderm, mesoderm, and endoderm). Confusingly, mature ovarian teratomas are sometimes referred to as ovarian dermoid cysts!"
"Epidermoid cysts are usually congenital (arising from ectodermal inclusion during neural tube closure 8) and sometimes acquired (post-surgical or post-traumatic implantation). They consist of an external layer of ectoderm-derived squamous epithelium and internal desquamated keratin debris. Dermoid cysts are also derived from ectodermal elements; the difference between epidermoid and dermoid cysts is that the latter also contain epidermal appendages. In contrast, teratomas are a type of neoplasm (epidermoid and dermoid cysts are non-neoplastic) that contain tissues from at least two of the three somatic tissue lines (these being ectoderm, mesoderm, and endoderm). Confusingly, mature ovarian teratomas are sometimes referred to as ovarian dermoid cysts!"
"interhemispheric: < 5% 9,10"
"Epidermoid cysts are usually congenital (arising from ectodermal inclusion during neural tube closure 8) and sometimes acquired (post-surgical or post-traumatic implantation). They consist of an external layer of ectoderm-derived squamous epithelium and internal desquamated keratin debris. Dermoid cysts are also derived from ectodermal elements; the difference between epidermoid and dermoid cysts is that the latter also contain epidermal appendages. In contrast, teratomas are a type of neoplasm (epidermoid and dermoid cysts are non-neoplastic) that contain tissues from at least two of the three somatic tissue lines (these being ectoderm, mesoderm, and endoderm). Confusingly, mature ovarian teratomas are sometimes referred to as ovarian dermoid cysts!"
"Epidermoid cysts are usually congenital (arising from ectodermal inclusion during neural tube closure 8) and sometimes acquired (post-surgical or post-traumatic implantation). They consist of an external layer of ectoderm-derived squamous epithelium and internal desquamated keratin debris. Dermoid cysts are also derived from ectodermal elements; the difference between epidermoid and dermoid cysts is that the latter also contain epidermal appendages. In contrast, teratomas are a type of neoplasm (epidermoid and dermoid cysts are non-neoplastic) that contain tissues from at least two of the three somatic tissue lines (these being ectoderm, mesoderm, and endoderm). Confusingly, mature ovarian teratomas are sometimes referred to as ovarian dermoid cysts!"
"often heterogeneous/dirty signal; higher than CSF"
"Calcification is seen in a minority of cases (10-25% 8), and rarely an epidermoid cyst may be hyperattenuating due to haemorrhage, saponification or high protein content ("white epidermoids"). The interhemispheric epidermoids are reported to have peripheral calcification."