OBJECTIVE: In order to offer the basis for the operation of the @entity189 , the local-regional invasion patterns of the @entity189 were investigated. METHODS: Twenty-six surgical specimens obtained from @entity1 who undergone laryngopharyngectomy were subjected to a whole organ section study. RESULTS: @entity5 located in the lateral wall of the pyriform sinus spread mainly towards the lateral wall of the hypopharynx. @entity5 located in the inner wall of the pyriform sinus spread mainly towards the larynx and opposite side pyriform sinus, the paraglottic space and thyroid cartilage were particularly frequent invaded. It was rare of the invading of the cricoid cartilage. The invasion of the @entity2582 and preepiglottic space across the midline had not been found. There were two invading routines, the paraglottic space and preepiglottic space. The invasion of the paraglottic space was through the aryepiglottic fold and the inner surface of the thyroid cartilage. The invading of the preepiglottic space was through the aryepiglottic fold and the upper part of the inner surface of the thyroid cartilage. CONCLUSIONS: The invading of the preepiglottic space was not the contraindication of the partial laryngectomy. It is practicable to preserve the laryngeal function in most of the @entity1 while @entity5 located on the lateral or inner wall of the pyriform sinus. There was a tendency to the invading to the contralateral side in the inner wall of the pyriform or postcricoidarytenoid region. Attention should be paid to the submucosal spreading in the postcricoidarytenoid region.

[Histological study of the local-regional invasion of XXXX ].

@entity1 :: ('9606', 'Species') :: ['patients'] @entity5 :: ('MESH:D009369', 'Disease') :: ['Tumors', 'tumors'] @entity189 :: ('MESH:D002277', 'Disease') :: ['pyriform sinus carcinoma'] @entity2582 :: ('MESH:C537690', 'Disease') :: ['epiglottis']
@entity189 :: (MESH:D002277,Disease) :: ['pyriform sinus carcinoma']
