Differentiation of pyriform sinus cancer from supraglottic laryngeal cancer by computed tomography.

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Abstract
Nine pyriform sinus tumors and 16 supraglottic laryngeal lesions were studied by computed tomography. The pyriform sinus tumors had a much higher incidence of thyroid cartilage invasion (5 of 9 patients) and involved the posterolateral margins of the cartilage. Only 2 of 16 supraglottic tumors reached the thyroid cartilage, involving the midline or more inferior margins. The supraglottic tumors grew in a circumferential pattern, and extension was bilateral when the preepiglottic space was involved. Lesions of the pyriform sinus more frequently showed unilaterl involvement. Lymph node metastases were seen in an approximately equal proportion of patients in the 2 groups and correlated more with the size of primary tumor than with its site of origin. Posteroinferior invasion of the space between the thyroid and cricoid cartilage was seen only with pyriform sinus lesions.

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