Weissman J L, Tabor E K, Curtin H D
Department of Radiology, University of Pittsburgh School of Medicine, Eye and Ear Hospital, PA 15213.
Radiology. 1991 Jan;178(1):145-8. doi: 10.1148/radiology.178.1.1984293.
A sphenochoanal polyp is a solitary mass of low attenuation on computed tomographic (CT) scans that arises from the sphenoid sinus and extends through the sphenoid ostium, across the sphenoethmoid recess, and into the choana (the boundary between the nasal cavity and nasopharynx). More often, however, a choanal polyp is an antrochoanal polyp, which arises from the maxillary antrum, protrudes through the middle meatus, extends into the nasal cavity, and continues back to the choana. Contiguous axial or coronal magnetic resonance and CT images help clearly differentiate the rare sphenochoanal polyp from the more common antrochoanal polyp. The sinus of origin is important to identify, as the surgical approach depends on the target sinus.
蝶筛窦息肉在计算机断层扫描（CT）上表现为低密度的孤立性肿块，起源于蝶窦，经蝶窦开口延伸，穿过蝶筛隐窝，进入后鼻孔（鼻腔与鼻咽之间的边界）。然而，更常见的是鼻后孔息肉，它起源于上颌窦，经中鼻道突出，延伸至鼻腔，并向后延续至后鼻孔。相邻的轴位或冠状位磁共振成像和CT图像有助于清晰区分罕见的蝶筛窦息肉和更常见的鼻后孔息肉。确定息肉的起源鼻窦很重要，因为手术入路取决于目标鼻窦。
