The object of this paper is to distinguish epithelial cysts from sebaceous cysts and to study the incidence of malignant change in these cysts.
This study is based on a review of the records of 271 cases of sebaceous and epithelial cysts which were excised at the Mayo Clinic during 1939 and 1940. In all cases microscopic diagnosis of sebaceous or epithelial cyst (keratoma) had been made, but not always was sharp distinction between the two types made. Of the 271 cases, in only 88 were specimens available for further study, but we believe that these cases probably represented all that were of pathologic interest.
There are relatively few articles in the literature identifying epithelial cysts, which have also been referred to as epidermoids and have been included under the broad term of atheroma. The latter term apparently has been used for both epithelial and sebaceous cysts. As early as
LOVE WR, MONTGOMERY H. EPITHELIAL CYSTS. Arch Derm Syphilol. 1943;47(2):185–196. doi:10.1001/archderm.1943.01500200029003