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We classified patients with paranasal sinus disease into 3 categories, those with or without a history of previous Caldwell-Luc procedure according to clinical diagnosis. Class A: postoperative maxillary cysts in 22 patients. Class B: paranasal sinusitis in 21 patients who had undergone Caldwell-Luc surgery. Class C: paranasal sinusitis in 62 patients who had not undergone paranasal sinus surgery. This study evaluated the ethmoid, frontal and sphenoid sinuses in these 3 classes of patients on coronal CT scan. High density areas in the ethmoid sinuses were observed in 25.0% of class A, 80.0% of class B, and 82.1% of class C; in the frontal sinuses in 19.0% of class A, 73.7% of class B, and 73.3% of class C; in the sphenoid sinuses in 18.2% of class A, 57.1% of class B, and 51.6% of class C. As a result, the prevalence of high density areas in the ethmoid, frontal and sphenoid sinuses in patients (class A) with postoperative maxillary cysts was significantly lower than those in patients (classes B and C) with paranasal sinusitis. The authors speculated that postoperative maxillary cysts arise in cases that had few or lightly inflammatory changes of the ethmoid, frontal and sphenoid sinuses.

The Coronal CT of the Paranasal Sinuses in the Postoperative Maxillary Cyst.