Two cases with an interseptal sinus cell mucocele: The different mechanisms of the development varying in the time of the onset

Abstract

Intersinus septal cells (ISSC) are defined as cells confined to the thin septum separating the frontal sinuses. In 2008, Som et al. first described four cases with a mucocele proved to have arisen in ISSC. Here, we report two cases with a mucocele in ISSC, representing the second report to appear in the English literature. Case 1 involved a mucocele in the center of the frontal lesion with rudimentary bilateral frontal sinuses, which suggested that the ISSC mucocele occurred during very early development of the frontal sinuses. Case 2 concerned a mucocele in the unilocular frontal sinus invading the left orbit. The frontal sinus septum was destroyed with partial ‘Y’-shaped remnants, which implied the ballooning and bursting of the ISSC mucocele into both sides of the frontal sinus. The two different mechanisms of development of the ISSC mucoceles may vary in relation to the time of onset.

Keywords

• Intersinus septal cell
• mucocele
• modified Lothrop procedure