sequestration cyst

se·ques·tra·tion cyst

a cyst derived from cells that sequestered (separated) from a cellular mass during development of a tissue or organ.
References in periodicals archive ?
Epidermoid cysts are sequestration cysts that form by proliferation of epidermal cells that arise from the ectoderm within an unusual location within the thymus [2].
Pear, "Epidermoid and dermoid sequestration cysts," The American Journal of Roentgenology, Radium Therapy, and Nuclear Medicine, vol.