資源描述:
《胰腺漿液性囊腺瘤CT表現(xiàn)》由會員上傳分享,免費在線閱讀,更多相關內容在教育資源-天天文庫。
1、胰腺漿液性囊性腫瘤CT表現(xiàn)2011-9背景胰腺漿液性囊性腫瘤(Serouscysticneoplasms,SCNs)大約占所有胰腺囊性腫瘤的20%。鏡下——囊樣結構,周圍包繞富含糖原的立方形細胞,細胞內含透明稀薄的漿液,同時可見血管豐富的膠原或透明樣變的基質。傳統(tǒng)的觀念認為SCN是多個微囊構成的腺瘤,影像上典型表現(xiàn)——蜂窩樣結構,伴中心瘢痕或鈣化。背景SCN根據(jù)肉眼所見分為5種亞型:漿液性微囊腺瘤——傳統(tǒng)意義上的SCN;漿液性寡囊腺瘤VHL相關囊性腫瘤實性漿液性腺瘤漿液性囊腺癌Typicalhoneycombpatternofserousmicrocystic
2、adenomaSerousmicrocysticadenomaofthepancreasshowingtypicalimagingfeatures.TypicalhoneycombpatternwithperipheraloligocysticportionAtypicaloligocysticpatternofserousoligocysticadenomaSerousoligocysticadenomaofthepancreasshowingatypicalimagingfeatures.Atypicalpleomorphicpatternofserous
3、oligocysticadenomaSerousoligocysticadenomaofthepancreasshowingatypicalimagingfeaturesAtypicalunilocularpatternofserousoligocysticadenomaSerousmicrocysticadenomaofthepancreasshowingatypicalimagingfeaturesofsolidhypervascularpatternwitholigocysticportion.Atypicalsolidpatternofsolidser
4、ousadenomaSerousmicrocysticadenomaofthepancreasshowingatypicalimagingfeatures.Awell-demarcatedhypervascularmass(arrows)withlobulatedoutermarginisseeninthetailofthepancreas.Notethedilatationofupstreampancreaticduct(arrowhead)andatrophyofpancreaticparenchyma.Tworadiologistsconfusedthi
5、slesionwithaneuroendocrinetumor.鑒別診斷粘液性囊腺瘤幾乎均發(fā)生于女性約95%位于胰體尾部典型表現(xiàn)——大囊(平均8-10cm)、厚壁、壁結節(jié),少數(shù)伴鈣化如病變位于胰頭、呈分葉狀寡囊結構,囊壁無強化,提示SCN。鑒別診斷導管內乳頭狀粘液腺瘤好發(fā)于老年男性,平均年齡>60歲,多位于胰頭單房或多房性腫瘤,常伴分隔及壁結節(jié);增強掃描,分隔及壁結節(jié)輕中度強化;主胰管及分支胰管不同程度擴張常伴有胰腺的萎縮鑒別診斷實性假乳頭狀瘤男:女20:1發(fā)病年齡,90%<35歲,約6%>50歲通常是單發(fā)、邊界清晰、囊實性病變,2.5~30cm,可發(fā)生于胰腺
6、的任何部位,約30%伴鈣化可侵犯周圍器官如胃、十二指腸、門脈、脾等,但很少侵犯膽總管鑒別診斷神經內分泌腫瘤薄層CT可能有助于識別微囊結構MR-T2序列如看到病變呈多個囊狀長T2信號及內部低信號分隔有助于診斷