An open epidermoid cyst can be seen when an epidermoid cyst spontaneously ruptures, but still retains some of the accumulated keratin; in this case, the cyst’s outline may be more subtle, and usually assumes an oval shape with the long axis oriented anteriorly and posteriorly. An open cyst may also produce a mottled appearance.
Photos of open epidermoid cyst:
Capillary ectasia and white submucosal abnormality (1 of 3)
Left vocal cord (right of photo) has not only overlying capillary ectasia, but a white submucosal abnormality.
Open cyst (3 of 3)
Closer view. While an intact epidermoid cyst has a distinct outline, an open cyst develops a more mottled appearance. It may leak intermittently from a tiny dimple or sulcus which is sometimes seen at very close range.
Hoarse voice (1 of 4)
A young woman with a history of repeated loud cheering during athletic activities, to the point of hoarseness. She has a sulcus of the right cord (left of photo), and an open cyst of the left (right of photo). Openings from sulcus and cyst are indicated by dotted lines.
Cyst + sulcus (2 of 4)
Narrow band light. The lateral lip of a sulcus is often bordered by a prominent capillary as seen here. An open cyst assumes an elliptical shape in the anteroposterior direction. It fails to empty completely because the opening draining it is smaller than the diameter of the cyst.