胰腺胶样癌四例临床病理学分析

目的 探讨胰腺胶样癌的临床病理学特征、诊断、鉴别诊断及分子生物学特点.方法 分析4例胰腺胶样癌的临床特点,对标本进行病理形态学观察、免疫组织化学EnVision法和K-ras基因突变检测.结果 4例胶样癌中3例发生在胰头部,患者均为男性;另1例在胰体尾部,为女性;平均发病年龄为56.5岁.其中2例首发症状为腹痛,1例为尿糖增高,1例为查体发现.3例大体形态为囊实性结节,囊内含黏液,1例大体呈实性.低倍镜下,纤维及胰腺组织中可见边界清楚的黏液结节,大的黏液湖中可见纤细的纤维结缔组织间隔成多个小黏液湖;肿瘤细胞漂浮在黏液湖中,呈小巢或条索状,或腺管状,也可看到印戒细胞漂浮其中.3例癌周可见肠型胰腺导管内乳头状黏液性肿瘤(IPMN),仅例1伴发胰胆管型IPMN.免疫组织化学染色3例MUC2细胞膜阳性,1例MUC1阳性.3例中例1和例3发现K-ras基因突变,突变位点均位于12密码子Gly12Asp(GGT＞GAT)和Gly12Arg( GGT＞ CGT).结论 胰腺胶样癌是少见的胰腺导管腺癌亚型,经常伴发于IPMN和胰腺黏液性囊性肿瘤,应与普通胰腺导管腺癌、印戒细胞癌及假性囊肿等病变相鉴别.免疫组织化学MUC2多阳性表达,MUC1多为阴性,K-ras基因突变率较低.     

胰腺囊性肿瘤92例临床病理分析

目的探讨胰腺囊性肿瘤的临床病理特征及免疫组织化学特点,以期提高对胰腺囊性肿瘤的认识。方法复习复旦大学附属中山医院1999—2005年间手术切除的92例胰腺囊性肿瘤的临床病理资料和影像资料,根据2002年WHO胰腺肿瘤分类标准将其分类。并采用免疫组织化学EnVision法,借助-组抗体进行鉴别诊断。结果在92例囊性肿瘤中,发病年龄16～80岁,男33例,女59例。其中,浆液性肿瘤18例,黏液性肿瘤14例,导管内乳头状黏液性肿瘤36例,实性假乳头状肿瘤18例,导管腺癌囊性变4例,胰腺内分泌肿瘤囊性变2例。免疫组织化学检测无特异性标记物可以完全区分各类型,常有交叉和重叠。浆液性囊腺瘤表达MUC-1,黏液性囊性肿瘤表达MUC-5AC为主,实性假乳头状肿瘤表达d-抗胰蛋白酶、d-抗胰糜蛋白酶、波形蛋白及孕激素受体,导管内乳头状黏液性腺瘤表达MUC-2,囊性恶性肿瘤主要表达MUC-1。结论胰腺各类囊性肿瘤在临床症状、影像学表现、组织形态及免疫表型上均有一定特征,但均无特异性,需结合起来综合判断,才能做出正确诊断,以指导临床治疗和预后判断。     

胰腺导管内乳头状黏液性肿瘤的新认识

1定义 1982年,日本学者Ohhashi等报道了4例特殊类型的胰腺肿瘤,伴有胰腺导管扩张和大量黏液分泌。之后,对发生在胰腺的此种类型的肿瘤报道逐渐增加。1996年,WHO将其定义为胰腺导管内乳头状黏液性肿瘤（intraductal papillary mucinous neoplasms,IPMNs）,并将它与其他黏液分泌胰腺囊性肿瘤区分开来。WHO（2000年）对胰腺导管内乳头状黏液性肿瘤的定义为发生在胰腺主导管或其主要分支导管内的乳头状黏液分泌肿瘤,[第一段]     

卵巢交界性浆黏液性肿瘤临床病理分析

目的探讨卵巢交界性浆黏液性肿瘤的临床病理特征、诊断、鉴别诊断、治疗及预后。方法回顾性分析10例卵巢交界性浆黏液性肿瘤的临床病理资料,并复习相关文献。结果患者年龄27～59岁,平均45岁。5例肿瘤位于左侧卵巢,5例位于右侧卵巢。肿瘤最大直径5～13 cm,切面以囊性为主,囊壁内侧见大小不等的乳头状赘生物,囊内含黏液或黏稠胶冻样物。肿瘤组织主要由子宫颈管型黏液上皮及浆液性上皮组成,肿瘤细胞呈腺样、粗大球茎状或乳头状排列,轻～中度异型,核分裂象不易见,肿瘤间质内见特征性中性粒细胞浸润。6例肿瘤伴卵巢子宫内膜异位症,1例合并良性附壁结节,2例合并子宫内膜样癌。免疫表型:肿瘤细胞PAX-8、CK7、ER均呈阳性(10/10),PR阳性(7/10),CK20、CDX2均呈阴性(10/10),WT-1阴性(9/10),Ki-67增殖指数1%～10%。10例患者FIGO分期ⅠA期2例,ⅠB期1例,ⅠC1期4例,ⅠC2期1例,ⅠC3期2例。术后随访12～55个月,除1例在29个月盆腔包块复发以外,其余9例均未出现复发或转移。结论卵巢交界性浆黏液性肿瘤相对少见,具有独特的临床病理特征和免疫表型,手术切除治疗预后较好。     

胰腺导管内乳头状黏液肿瘤19例的病理学分析

目的 总结并分析胰腺导管内乳头状黏液肿瘤(IPMN)临床病理特征.方法 收集19例IPMN的临床及影像学资料,通过光镜观察及免疫组织化学EnVision法[抗体包括p53、c-erbB-2、Ki-67、p16、Fascin]分析其临床、病理学特征及免疫表型.结果 19例IPMN患者平均年龄59岁,中位年龄61岁,男女比例12:7,6例有长期吸烟史,1例合并结肠腺癌,临床表现为上腹部不适、腹痛、食欲减退、体重下降、脂肪泻等.腹部CT及B超检查多数病例表现为囊性占位性病变,囊内有分隔,囊壁有乳头状回声,个别病例表现为单发或多发实性占位,其中3例行十二指肠镜逆行胰管造影(ERCP)检查见十二指肠乳头处有胶冻样黏液分泌物.18例行肿物及部分胰腺切除术,1例行胰管内肿瘤摘除术,11例主要位于胰头,病理诊断1例为胰腺导管内乳头状黏液腺瘤,3例为交界性IPMN,15例为胰腺导管内乳头状黏液腺癌,其中12例伴有浸润,浸润癌中10例为乳头型和(或)管型,2例为黏液型合并管型,2例为原位癌.大体检杳17例为单发,2例为多发病灶,6例为实性占位,13例表现为囊性或囊实性占位,囊性区部分内肇光滑剑有乳头附着,部分囊腔内充满乳头状组织;镜下检查8例为肠型,7例为胰胆管上皮型,3例为胃型,1例为嗜酸细胞型;导管周围纤维组织均明显增生,16例周围胰腺组织伴有慢性胰腺炎,2例肠壁浸润,淋巴结均未发现转移;术后13例分别随访4～48个月,平均随访20个月,1例术后24个月死于其他原因,1例可疑肝转移,1例姑息手术后胰头占位,10例无复发.免疫组织化学6例p53阳性,5例p16阳性,8例Fascin阳性,c-erbB-2均阴性,Ki-67指数1%～80%,平均38%.结论 IPMN为一组少见的胰腺肿瘤,肿瘤主要位于胰管内,伴有胰管扩张,肿瘤细胞为黏液性,有乳头形成,乳头状黏液腺癌多见,约2/3病例伴有浸润.Ki-67指数超过15%应考虑恶性.肿瘤预后较胰腺导管癌明显要好,治疗主要是局部切除及相应化疗,应长期随访.影像学、ERCP及胰液细胞学检查有助于疾病的早期发现和诊断.     

胰腺黏液性囊性肿瘤临床病理分析

目的；探讨胰腺黏液性囊性肿瘤（MCN）的临床病理学特点。方法：6例MCN均行B超或CT检查。除1例外，均作了手术切除治疗。对6例（MCN）作常规HE及免疫组织化学染色观察。结果：6例MCN中，女性4例，男性2例，平均年龄47岁，均位于胰腺体尾部。黏液性囊腺瘤（MCA）3例，囊壁内衬高柱状黏液上皮，上皮周围可见卵巢样间质组织；黏液性囊腺癌（MCC）3例，黏液上皮 有不典型增生，均有囊壁或胰腺组织的浸润，1例上皮周围可见卵巢样间质。CEA和CK 7在上皮中均阳性，c-erbB－2均阴性，间质SMA均阳性。结论：胰腺MCN是好发于中年女性的少见肿瘤，绝大多数发生于胰腺体尾部。MCA内衬高柱状上皮，上皮外来卵巢样间质包绕；MCC上皮细胞有不典型增生， 浸润性生长。MCN手术切除率高。     

胰腺囊性肿瘤53例临床病理特征

目的 探讨胰腺囊性肿瘤(pancreatic cystic neoplasm, PCN)的临床病理学特征。方法 收集53例PCN的临床病理资料，行HE及免疫组化EnVision法检测，并复习相关文献。结果 53例PCN中浆液性囊性肿瘤(serous cystic neoplasm, SCN)22例，实性假乳头状肿瘤(solid pseudopapillary neoplasm, SPN)13例(伴高级别转化1例),黏液性囊性肿瘤(mucinous cystic neoplasm, MCN)12例(伴相关浸润性癌2例，伴高级别异型增生1例),导管乳头状黏液性肿瘤(intraductal papillary mucinous neoplasm, IPMN)6例(伴相关浸润性癌1例，伴原位癌2例)。免疫表型：(1)22例SCN:22例均表达上皮标志物CK、CK7、CK19,10例表达α-inhibin, 22例均不表达CgA、Syn、CD56、vimentin, Ki-67增殖指数均约1%;(2)13例SPN:13例均表达PR、CD10及β-catenin, 6例表达vimentin, 5例...     

乳腺黏液性病变的病理诊断与鉴别诊断

伴有黏液形成的乳腺病变包括含囊腔内黏液的乳腺纤维囊性变、黏液囊肿样病变(mucocele-like lesion ,MLL)、良性病变和(或)伴有不典型导管上皮增生(atypical ductal hyperplasia,ADH)、导管原位癌(ductal carcinoma in situ,DCIS)、黏液性乳头状病变、黏液癌和其他伴间质黏液样物质的病变.除了这些与细胞外黏液相关的病变外,小叶肿瘤、DCIS和浸润性癌,尤其是浸润性小叶癌含有胞质内黏液,还有间质的黏液样变在许多病变如纤维腺瘤和叶状肿瘤,多形性腺瘤和结节性黏蛋白沉积症均可见,恶性类似病变包括产生基质的癌和鳞癌伴黏液间质.本文重点讨论伴有细胞外黏液形成的黏液性乳腺病变的诊断与鉴别诊断,该组病变在良性病变、不典型增生、原位癌及浸润性癌的鉴别上有一定难度.     

卵巢黏液性囊性肿瘤伴实性附壁结节

目的：探讨卵巢黏液性囊性肿瘤伴实性附壁结节的临床病理学特点。方法：对2例卵巢黏液性囊性肿瘤进行光镜观察和免疫组化染色并复习文献。结果：1例卵巢黏液性交界性乳头状囊腺瘤伴实性附壁恶性纤维组织细胞瘤结节，结节内瘤细胞呈多形性。1例卵巢黏液性囊腺瘤伴实性附壁间变性癌结节；间变性癌结节内瘤细胞体积较大，胞质丰富，嗜酸，少数胞质透明，排列呈巢或索状；免疫表型：EMA和cytokeratin阳性。恶纤组结节中肿瘤细胞AACT和vimentin阳性。结论：免疫组化有助于卵巢黏液性囊性肿瘤伴实性附壁结节的诊断及鉴别诊断。     

导管内和乳头状变异型腺泡细胞癌：胰腺导管内肿瘤鉴别诊断的一个新补充

近年来，胰腺导管内肿瘤（IN）的识别和鉴别诊断已经引起了足够的重视，由于这些肿瘤的发病率（尤其是导管内乳头状黏液性肿瘤-IPMNS）占胰腺切除术的10％以上，作为浸润性癌的前驱病变其意义得到了较好的认可。腺泡细胞癌（ACCs）是典型的实体型肿瘤，然而，最近作者遇到7例可能会误诊为IN的具有导管内生长和／或乳头状／乳头囊性构型的ACCs，并对这些病例的临床病理特征进行了分析。男性4例，女性3例，平均年龄59岁，肿瘤大小平均为4．9cm（传统的ACCs平均为10cm）。[第一段]     

Cystic tumors of the liver: on the problems of diagnostic criteria

We report on three cases of cystic neoplasms of the liver with mucinous epithelium. Case 1 showed a low-grade cystic neoplasm with ovarian-like stroma (OS). Case 2 showed a low-grade cystic neoplasm without OS, and case 3 showed a high-grade cystic neoplasm without OS. In all three cases, bile duct communication (BDC) was absent. Currently, pancreatic mucinous cystic neoplasm (MCN) and intraductal papillary mucinous neoplasm of the pancreas (IPMN) are clearly distinguishable. However, MCN of the liver and intraductal papillary neoplasm of the bile duct (IPN-B) are not as easily distinguished. According to the latest WHO classification (2010), these conditions are classed as typical MCN of the liver, MCNs of the liver without OS, or IPN-Bs without BDC. The clinicopathological differences between MCN without OS and IPN-B without BDC are controversial. We present three cases describing these presentations and discuss the difficulties related to the diagnostic criteria used to distinguish between MCN of the liver and IPN-B.     

Invasive ductal carcinoma of the pancreas tail with noninvasive growth through the nondilated main pancreatic duct and macroscopically cystic invasive carcinomatous glands

Noninvasive growth forming macroscopically dilated cystic pancreatic ducts is a fundamental feature of intraductal papillary mucinous neoplasm (IPMN), from which invasive carcinomas can arise. However, some invasive ductal carcinomas of the pancreas also show a macroscopically cystic feature. We experienced 2 cases of invasive ductal carcinoma of the pancreas tail with noninvasive growth through the main pancreatic duct without dilation at the body side, and with collection of macroscopically cystic carcinomatous glands infiltrating at the spleen side, which resembled some IPMNs and/or IPMN-derived invasive carcinomas. These cases were different from IPMN in that they lacked macroscopic dilatation of the pancreatic ducts, and the macroscopically dilated cystic carcinomatous glands were invasive but not intraductal. The intraductal component of the carcinomas showed papillary growth of neoplastic epithelia with atypia consistent with PanIN-3. Both intraductal and invasive components predominantly showed gastric mucin phenotype (MUC5AC+, MUC6 focally +, MUC2− or MUC2+ in scattered small number of cells). Recognition of these pancreatic carcinoma cases is important in the following 2 points: (1) The presence of such cases should always be kept in mind as differential diagnosis of IPMN or IPMN-derived invasive carcinoma in imaging and pathologic diagnoses. (2) The histogenesis of these cases might be placed in the intermediate between 2 major histogenetic pathways of pancreatic carcinoma, that is, one from microscopic precursors called PanIN and the other from macroscopic precursors of IPMN. These cases can be regarded as invasive carcinomas derived from semimacroscopic extension of the intraductal lesion of the main pancreatic duct.     

Biliary cystic tumors with bile duct communication: a cystic variant of intraductal papillary neoplasm of the bile duct.

Biliary cystic tumors, which are also called biliary cystadenoma and cystadenocarcinoma, are thought to be a heterogeneous disease entity, and some of them are known to show a luminal communication to the bile duct. In this study, we examined the clinicopathological features of nine cases of biliary cystic tumors with bile duct communication. They were composed of five males and four females with an average age of 67 years (52-84 years). They were multilocular (eight cases) or unilocular (one case), and all cases contained mucinous fluid. A direct luminal communication with the bile ducts was identified in five cases on preoperative or intraoperative cholangiographies. Biliary cystic tumors examined in this study were histologically adenoma (one case), adenocarcinoma in situ (six cases), and adenocarcinoma associated with microinvasive mucinous carcinoma (two cases). One case of adenocarcinoma in situ also had the adenoma component (adenocarcinoma in adenoma). Dysplastic mucinous epithelium proliferated in flat, micropapillary and papillary fashions within the intracystic spaces. Intraepithelial neoplasm was observed within non-dilated adjacent bile ducts, suggesting a direct luminal communication between the cystic tumors and the bile duct. Ovarian-like stroma was not observed in their walls in any cases. Immunohistochemically, seven cases expressed MUC1 or MUC2 in the neoplastic biliary epithelium. All cases except one were alive without any evidences of tumor recurrence after total excision (3-156 months after surgery). These clinicopathological features resembled those of intraductal papillary neoplasm of the bile duct, which had been reported as a biliary counterpart of pancreatic intraductal papillary mucinous neoplasm. In conclusion, biliary cystic tumors with bile duct communication could be regarded as intraductal papillary neoplasm with a prominent cystic dilatation of the bile duct and mucin retention, rather than true biliary cystic neoplasms.     

A novel approach to biliary tract pathology based on similarities to pancreatic counterparts: Is the biliary tract an incomplete pancreas?

There are peribiliary glands around the biliary tract, and these glands drain into the bile duct lumen. Interestingly, small amounts of pancreatic exocrine acini are intermingled with these glands. Experimental studies using animals suggest that the biliary tract shows some potential for pancreatic differentiation. It is noteworth that the biliary tract and pancreas have similar pathological features. IgG4‐related sclerosing cholangitis and autoimmune pancreatitis are representative inflammatory diseases with similar features. Intraductal papillary neoplasms are found in the biliary tract and also in the pancreas: intraductal papillary neoplasm of the bile duct (IPNB) and intraductal papillary mucinous neoplasm of the pancreas (IPMN). IPNB and IPMN share common histologic and phenotypic features and biological behaviors. Interestingly, mucinous cystic neoplasm (MCN) arises in both the pancreas and the heaptobiliary system. Intraductal tubular neoplasia is found in both the biliary tract and pancreas as well. Intraepithelial neoplasm is found in the biliary tract and pancreas: biliary intraepithelial neoplasm (BilIN) and pancreatic intraepithelial neoplasm (PanIN). BilIN and PanIN are followed by conventional invasive adenocarcinoma, while IPNB and IPMN are followed by tubular adenocarcinoma and mucinous carcinoma in both organs. Further study of the biliary tract's pathophysiology based on its similarity to pancreatic counterparts is warranted.     

Biliary tumors with pancreatic counterparts

Some biliary diseases mimic pancreatic diseases pathologically as well as pathogenetically. Such diseases can be called “biliary diseases with pancreatic counterparts”. Biliary intraepithelial neoplasm (BilIN), intraductal papillary neoplasm of bile ducts (IPNB), hepatobiliary mucinous cystic neoplasm (hMCN), and IgG4-inflammatory pseudotumor represent the biliary counterparts of pancreatic intraepithelial neoplasm (PanIN), intraductal papillary mucinous neoplasm of pancreas (IPMN), pancreatic MCN, and mass forming type 1 autoimmune pancreatitis (AIP), respectively. BilIN and PanIN represent pre-invasive intraepithelial stages of nodular sclerosing cholangiocarcinoma and pancreatic ductal adenocarcinoma, respectively. IPNB and IPMN are grossly visible, predominant papillary, intraductal neoplasms that may progress to invasive carcinoma. Morphologically similar MCNs with subepithelial ovarian-like stroma occur in both the hepatobiliary system as well as the pancreas. IgG4-inflammatory pseudotumor, usually of the lymphoplasmacytic type, and mass forming type 1 AIP represent IgG4-related disease in the biliary tree and pancreas respectively. The biliary tract, which is associated with the peribiliary glands, including the pancreatic acini, can be regarded as an incomplete pancreas, so several diseases mimicking pancreatic diseases may be expected to occur in the biliary tract (biliary diseases with pancreatic counterparts).     

Intraductal papillary mucinous neoplasm (IPMN) of the gastric-type with focal nodular growth of the arborizing papillae: a case of high-grade transformation of the gastric-type IPMN

We present a case of intraductal papillary mucinous neoplasm (IPMN) of the pancreas, demonstrating a process of high-grade transformation of the gastric-type IPMN. An 83-year-old Japanese woman underwent pylorus-preserving pancreatoduodenectomy for removal of a multicystic mass of the pancreas head, which had been followed up for 7 years. The removed tumor was a low-grade gastric-type IPMN spreading in the branch ducts, focally forming an intraluminal nodular lesion. The nodular lesion was comprised of arborizing papillotubular proliferation of cuboidal to columnar epithelia with high-grade atypia, and was characterized by diffuse MUC1 expression and a gastric mucin phenotype (focal MUC5AC and MUC6 expressions). Therefore, the nodular lesion was consistent with the pancreatobiliary-type IPMN, and the present case suggests that the low-grade gastric-type IPMN may progress to a focal intraductal carcinoma over the years, and the pancreatobiliary-type IPMN may be one of the forms of such high-grade transformation of the gastric-type IPMN. One of the cystic lesions was an oligocystic-type serous cystic neoplasm (serous cystadenoma), which might be an incidental concomitance or have a common basis.     

Pancreatic mucinous cystic neoplasm of the main pancreatic duct

Mucinous cystic neoplasm and intraductal papillary mucinous neoplasm are 2 types of cystic pancreatic mucinous tumors, each with its own distinct clinicopathologic features and pathogenetic mechanisms. We report here an unusual pancreatic mucinous neoplasm with features of both a mucinous cystic neoplasm and an intraductal papillary mucinous neoplasm in a 40-year-old woman who underwent total pancreatectomy. The endoscopic retrograde cholangiopancreatogram and gross examination demonstrated a mucin-producing intraductal neoplasm involving the length of the main pancreatic duct, typical of main duct intraductal papillary mucinous neoplasm, but histology of the main duct showed involvement by a biphasic tumor composed of columnar epithelium overlying ovarian-type stroma, characteristic of a mucinous cystic neoplasm. Immunohistochemistry confirmed that the stromal cells expressed estrogen and progesterone receptors, inhibin, and calretinin. Pancreatic mucinous cystic neoplasm involving the entire main pancreatic duct has not, to our knowledge, been previously reported.     

Ruptured mucinous cystic neoplasm with an associated invasive carcinoma of pancreatic head in a pregnant woman: report of a case and review of literature

Mucinous cystic neoplasm (MCN) of the pancreas is characterized by mucin-producing columnar epithelium and an ovarian-type stroma. It occurs almost exclusively in women and is almost always located in the pancreatic body or tail. Here, we report a case of large MCN located in the pancreatic head but not in the body nor tail in a 32-year-old pregnant woman, which was thought to have grown rapidly during pregnancy. It was ruptured at 34 weeks of gestation and the patient was admitted to the emergency department of the University of Fukui Hospital with an acute abdomen. Emergency cesarean section followed by pancreaticoduodenectomy was performed. The tumor consisted of many small cysts lined by a single-layer of mucinous epithelium with papillary growth and partial solid parts showing invasive growth and sarcomatoid changes, indicating mucinous cystic neoplasm with an associated invasive carcinoma (previously referred as mucinous cystadenocarcinoma). Thickened septa revealed ovarian-type stroma strongly positive for α-inhibin and partly positive for progesterone receptor immunohistochemically. We also review and discuss previous reports of MCNs including those with an associated invasive carcinoma in pregnant patients.     

Oncocytic papillary neoplasms of the biliary tract: a clinicopathological, mucin core and Wnt pathway protein analysis of four cases

AIMS: Oncocytic change in papillary neoplasms of the biliary tract is a very uncommon finding with little known about pathogenesis, immunophenotype and prognosis, especially in comparison to similar lesions in the pancreatic ductal system. We report four cases of oncocytic biliary intraductal papillary neoplasms (IPNs), highlighting the clinicopathological characteristics of these tumours, the immunohistochemical profile with regard to Wnt pathway proteins and mucin core protein (MUC) status, and compare these findings with the oncocytic variant of intraductal papillary mucinous neoplasm (IPMN) of the pancreas. METHODS: Four cases of oncocytic IPN of the extrapancreatic, biliary tree (two with accompanying invasive carcinomas) were examined for mucin profiles and Wnt signalling proteins. The cases were stained for: beta-catenin, c-myc, glutathione synthase kinase (GSK), E-cadherin, cyclin D1, and adenomatous polyposis coli (APC), and MUC1, MUC2, MUC3, MUC4, MUC5AC, MUC5B and MUC6, using standard immunohistochemistry. RESULTS: The cases occurred in three males and one female, ranging in age from 59 to 81 years. The lesions caused obstructive symptoms related to the biliary tree as well as non-specific abdominal symptoms. Typically, cystic lesions were noted grossly. All four of the IPNs were composed of distinctive oncocytic cells. The invasive carcinomas accompanying two of the cases were also composed of oncocytes. None of the cases showed aberrant expression of the Wnt signalling proteins, although cyclin D1 was markedly over-expressed in all four cases. Three of four cases showed the following mucin profile: MUC3, MUC4, MUC5AC, MUC5B and MUC6 positive. CONCLUSIONS: The Wnt pathway proteins (especially beta-catenin and E-cadherin) are expressed normally in oncocytic variants of intraductal papillary neoplasms of the biliary tree, and the mucin profile is similar to their counterparts in the pancreas.