Intracholecystic neoplasms (ICNs) (pyloric gland adenomas and intracholecystic papillary neoplasms, collectively also called intracholecystic papillary/tubular neoplasms) form multifocal, extensive proliferations on the gallbladder mucosa and have a high propensity for invasion (>50%). In this study, 19 examples of a poorly characterized phenomenon, mural papillary mucinous lesions that arise in adenomyomatous nodules and form localized ICNs, were analyzed. Two of these were identified in 1750 consecutive cholecystectomies reviewed specifically for this purpose, placing its incidence at 0.1%. Median age was 68 years. Unlike other gallbladder lesions, these were slightly more common in men (female/male=0.8), and 55% had documented cholelithiasis. All were characterized by a compact multilocular, demarcated, cystic lesion with papillary proliferations and mucinous epithelial lining. The lesions' architecture, distribution, location, and typical size were suggestive of evolution from an underlying adenomyomatous nodule. All had gastric/endocervical-like mucinous epithelium, but 5 also had a focal intestinal-like epithelium. Cytologic atypia was graded as 1 to 3 and defined as 1A: mucinous, without cytoarchitectural atypia (n=3), 1B: mild (n=7), 2: moderate (n=2), and 3: severe atypia (n=7, 3 of which also had invasive carcinoma, 16%). Background gallbladder mucosal involvement was absent in all but 2 cases, both of which had multifocal papillary mucosal nodules. In conclusion, these cases highlight a distinct clinicopathologic entity, that is, mural ICNs arising in adenomyomatous nodules, which, by essentially sparing the "main" mucosa, not displaying "field-effect/defect" phenomenon, and only rarely (16%) showing carcinomatous transformation, are analogous to pancreatic branch duct intraductal papillary mucinous neoplasms.
Download full-text PDF |
Source |
---|---|
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7658044 | PMC |
http://dx.doi.org/10.1097/PAS.0000000000001603 | DOI Listing |
Cureus
October 2024
Department of Pathology, Sree Balaji Medical College and Hospital, Chennai, IND.
Gallbladder adenomyoma/adenomyomatous nodule/adenomyomatosis is a benign condition characterized by mucosal invaginations within the gallbladder wall with or without proliferation of smooth muscle fibers. Gallbladder adenomyoma is often asymptomatic and discovered incidentally during imaging studies performed for other unrelated conditions. It can mimic malignancy on radiological findings, creating a diagnostic dilemma.
View Article and Find Full Text PDFInt J Surg Pathol
June 2023
Department of Pathology, Japan Self-Defense Forces Central Hospital, Tokyo, Japan.
Adenomyomatous hyperplasia, a common non-neoplastic lesion in the gallbladder, is rarely identified in the extrahepatic bile duct. Typically, these lesions appear as a nodule or mural thickening/elevation. However, in exceptional circumstances, pedunculated/polypoid adenomyomatous lesion occurs in the biliary tract; two cases in the gallbladder and only one case in the common bile duct have been reported.
View Article and Find Full Text PDFJ Vet Diagn Invest
January 2022
Department of Veterinary Pathology, Faculty of Agriculture, University of Miyazaki, Miyazaki, Japan.
A 14-y-old Miniature Pinscher bitch was admitted to a veterinary clinic because of inappetence and a distended abdomen; ultrasound examination revealed a fluid-filled uterus with a single 1-cm hyperechoic nodule in its lumen. Ovariohysterectomy was performed. Grossly, the uterine horns were distended irregularly and asymmetrically, and the uterine lumen contained 200-300 mL of brown watery fluid.
View Article and Find Full Text PDFAm J Surg Pathol
December 2020
Department of Pathology, Koç University Hospital and Koç University Research Center for Translational Medicine (KUTTAM), Istanbul, Turkey.
Intracholecystic neoplasms (ICNs) (pyloric gland adenomas and intracholecystic papillary neoplasms, collectively also called intracholecystic papillary/tubular neoplasms) form multifocal, extensive proliferations on the gallbladder mucosa and have a high propensity for invasion (>50%). In this study, 19 examples of a poorly characterized phenomenon, mural papillary mucinous lesions that arise in adenomyomatous nodules and form localized ICNs, were analyzed. Two of these were identified in 1750 consecutive cholecystectomies reviewed specifically for this purpose, placing its incidence at 0.
View Article and Find Full Text PDFActa Cytol
July 2008
Department of Pathology, Thoracic Surgery, Internal Medicine, Korea Cancer Center Hospital, Korean Institute of Radiological and Medical Science, Seoul, Korea.
Background: Typical cytologic features of pulmonary hamartoma (PH) are usually smears of hyaline cartilage, fibrous tissue, smooth muscle, adipocytic components and respiratory epithelium. Cytologic features of adenomyomatous hamartoma, a special variant of PH, are not documented in the literature and are confused with epithelial neoplasm in the case of sparse stromal cellularity.
Case: A 59-year-old man presented with a solitary pulmonary nodule by chest radiograph at his routine health examination.
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!