Smooth muscle tumor of the uveal tract is rare, and mostly located in the ciliochoroidal area. We report a unique case of posterior choroidal leiomyoma in a 27-yr-old man. Ophthalmoscopic examination disclosed an 11 mm-sized mass on the fundus two-disc diameters apart from the optic disc. With a suspicion of amelanotic melanoma, the globe was enucleated. The mass occupied the whole thickness of choroidal stroma beneath the pigmented retinal epithelium and composed of spindle cells arranged in intersecting fascicles. Immunohistochemical studies demonstrated immunoreactivities of the tumor cells for smooth muscle actin, desmin, and vimentin. Ultrastructurally, numerous intracytoplasmic filaments with fusiform focal densities, scattered segmental external laminae, subplasmalemmal densities, and pinocytic vesicles were noted. The leiomyoma in this case had several unusual features in that it was confined to the posterior choroid with no relation to the ciliary body, occupied the whole stroma of the choroid instead of suprauveal location, and occurred in a young male. It is important to include choroidal leiomyoma in the differential diagnosis of choroidal tumors.
Actins/analysis ; Adult ; Choroid Neoplasms/chemistry/*pathology ; Desmin/analysis ; Humans ; Leiomyoma/chemistry/*pathology ; Male ; Uveal Neoplasms/chemistry/*pathology ; Vimentin/analysis

OBJECTIVETo evaluate the effects of early tangential excision on the prevention of the progression of deep partial thickness burn wound.

METHODSTwelve burn patients with deep partial thickness burn wound were enrolled and received tangential excision of the burn wound within 24 postburn hours (PBHs). The histological samples were harvested from the wound before and 5 - 7 postoperative days (PODs) after the operation and the wound without operation 5 - 7 postburn days (PBDs). The samples were observed by means of HE staining, Masson's staining and the labelling of Vimentin antigen positive cells by immunohistological skill.

RESULTSThe inflammatory reaction of the burn wound without operation aggravated progressively along with that of disease and the tissue necrosis area enlarged. And the residual skin appendages disappeared due to the enhanced inflammatory reaction. The brown area expanded and light green area shrinked by Masson's staining. The Vimentin antigen positive cell count decreased significantly. But in the burn wound being performed tangential excision within 24 PBHs, focal inflammatory reaction exhibited evident ligher than that in burn wound without operation. Moreover, there appeared fresh granulation formation and partial epithelial coverage with no enlarged necrotic tissue area in the operated wound when compared with that in non-operated wound (P < 0.05). Furthermore, the light green area exhibited no obvious shrinking by Masson's staining and the Vimentin antigen positive cell count was much more in the operation area than that in non-operative area (P < 0.05).

CONCLUSIONIt might be beneficial to the host to perform tangential excision within 24 PBHs, which could remove burn wound necrotic tissue in time and hamper the progression of tissue degenerative injury. The healing process of deep partial thickness burn wound was therefore accelerated.

Adult ; Burns ; complications ; metabolism ; pathology ; Female ; Humans ; Male ; Necrosis ; Vimentin ; analysis ; Wound Healing

OBJECTIVETo study the clinicopathological and immunohistochemical features, histogenesis and prognosis of pleuropulmonary blastoma (PPB) in children.

METHODSPPB specimens from 16 pediatric cases with an age ranging from 1 year and 7 months to 5 years and 3 months (mean age of 3 years) were retrieved and analyzed by routine histological, immunohistochemical and electron methods.

RESULTSAmong 16 patients, there were 2 type I, 7 type II and 7 type III PPB cases. Type I PPB as multilocular cystic structure, consisted of thin fibrous wall lining the respiratory epithelium, subepithelial primitive blastema or immature mesenchymal cells, with or without rhabdomyoblastic differentiation or cartilage; Type II PPB as cystic-solid tumor, comparing with type I, consisted of intracystic components with appearance of anaplastic tumor cells. Type III PPB consisted of completely solid mass, the same as the solid region of type II, had mixed pattern including blastema, undifferentiated spindle-cell proliferations and sarcomas. In addition, anaplastic tumor cells and intra-and extra- cytoplasmic eosinophilic globules were also commonly present. Epithelial components in PPB were benign. Immunohistochemical study showed primitive mesenchymal differentiation of tumors. All cases were positive for vimentin, desmin, myogenin and SMA in tumors with skeletal muscle differentiation, S-100 was positive in tumors with cartilage differentiation. All tumors were negative for synaptophysin, CD99, and CD117. Benign epithelial components were positive for AE1/AE3 and EMA. In 12 cases, electron microscopy revealed few organelles in the primitive mesenchymal cells and rich heterochromatin in mesenchymal cells, the latter also demonstrating cytoplasmic myofilament dysplasia. Nine cases had clinical follow-up ranging from 5 to 48 months, of which 4 patients died.

CONCLUSIONSPPB is a rare lung neoplasm of children under the age of 6 years, with distinct pathological morphology. PPB may arise from lung or pleura mesenchymal cells and has a poor clinical outcome.

Child, Preschool ; Cysts ; pathology ; Desmin ; analysis ; Female ; Humans ; Infant ; Lung Neoplasms ; chemistry ; pathology ; Male ; Microscopy, Electron ; Myogenin ; analysis ; Prognosis ; Pulmonary Blastoma ; chemistry ; pathology ; Sarcoma ; pathology ; Vimentin ; analysis

Objective: To investigate the clinicopathological characteristics, immunophenotype, and molecular signatures of oncocytic papillary renal cell carcinoma (OPRCC), and to compare these findings with those in type 1 papillary renal cell carcinoma (PRCC 1). Methods: The clinicopathologic data of 19 patients with OPRCC from the Affiliated Hospital of Qingdao University (16 patients) and the 971 Hospital of People's Liberation Army Navy (3 patients) from October 2003 to February 2021 were collected. Histologic, immunohistochemical (IHC) and molecular analyses, together with a control group of 15 cases of PRCC I diagnosed in the same period, were assessed. Results: The cohort included 15 males and 4 females, with a median age of 61 years (range, 47-78 years). In 13 patients the tumors were found at physical examination; four presented with painless gross hematuria and two with low back pain. As for the pathologic stage, 14 patients were pT1, one patient was pT2a, three patients were pT3a and one patient was pT4. The tumor size ranged from 1.7-14.0 cm, with clear boundary and soft texture. The cut surface was grayish-yellow and grayish-red. Microscopically, the tumor cells were mainly arranged in papillary (10%-100%) and acinar (tubular) patterns, with strongly eosinophilic cytoplasm, round or irregular nuclei, and prominent nucleoli (WHO/ISUP grade Ⅲ). Two cases showed sarcomatoid differentiation. Stromal foamy macrophages were visible in all cases. IHC staining showed diffuse strong positivity for AMACR in all cases. RCC (18/19), CD10 (17/19), vimentin (16/19) and PAX8 (17/19) were positive in most tumors. CK7 was expressed in about 50% of cases. Fluorescence in situ hybridization identified trisomy 7 in eight patients, trisomy 17 in seven patients, and the two aberrations occurred simultaneously in seven cases. Eight of 13 men had Y chromosome deletion. All patients were followed up for 8-120 months. Three patients died of metastases at 8, 62 and 82 months postoperatively, respectively, and one patient relapsed 36 months after surgery. Compared with PRCC1, OPRCC tended to have higher nuclear grade, and stromal foam cell aggregation was more commonly found (P<0.05). The expression of CD10 and EMA were different (P<0.01). There was no significant difference in the survival rate between the two groups (P=0.239). Conclusions: OPRCC has unique morphologic features, and its immunophenotype overlaps but differs from PRCC1. The molecular results support that it belongs to a morphologic variation of PRCC. This tumor has similar biologic behavior to PRCC1, and has a poor prognosis when sarcomatoid differentiation occurs.
Aged ; Biological Products ; Biomarkers, Tumor/analysis* ; Carcinoma, Renal Cell/genetics* ; Female ; Humans ; Immunohistochemistry ; In Situ Hybridization, Fluorescence ; Kidney Neoplasms/genetics* ; Male ; Middle Aged ; Neprilysin/analysis* ; Vimentin/analysis*

BACKGROUND: Gastrointestinal stromal tumor (GIST) is the most common non-epithelial neoplasm arising in the gastrointestinal tract. The aim of this study is to investigate the correlation among the clinicopathologic features, presence of c-kit mutation, and immunohistochemical expression of c-kit in 61 cases of GISTs. METHODS: We divided the GISTs into three groups as benign, boderline and malignant, according to histologic grade. Exon 11 of the c-kit was amplified by PCR and sequenced. We performed immunohistochemical study for CD117, CD34, vimentin, SMA, desmin, and S-100 protein. RESULTS: Twenty-one cases were diagnosed as benign GISTs, 14 cases as borderline GISTs, and 26 cases as malignant GISTs. The shape, atypia, cellularity, and necrosis showed good correlations with the histologic grades of the GISTs.Mutations of exon 11 of the c-kit were detected in 3 benign GISTs, 4 borderline GISTs, and 13(%) malignant GISTs. Sequence analysis confirmed the deletion mutation (n=16) and the singlebase pair mutation (n=4). The immunohistochemical stainings showed myogenic differentiation(n=20), neurogenic differentiation (n=15), and neither myogenic or neurogenic differentiation(n=34). CONCLUSIONS: The GIST is the primitive mesenchymal tumor capable of divergent differentiation, and the mutation of the c-kit is a good parameter for the malignant GIST.
Desmin ; Exons ; Gastrointestinal Stromal Tumors* ; Gastrointestinal Tract ; Immunohistochemistry ; Necrosis ; Polymerase Chain Reaction ; S100 Proteins ; Sequence Analysis ; Sequence Deletion ; Vimentin

Although it is becoming widely accepted that medulloblastoma and cerebral primitive neuroectodermal tumor(PNET) are identical tumors occurring at different locations, there are some controversies in their orgin and pathological classification. As a method of investigating whether the tumors are identical in pathological aspects, immunohistochemical characteristics of medulloblastomas and cerebral PNETs were compared in this study. Also the prognostic significance of the immunohistochemical findings in medulloblastoma patients was analyzed. Clinical features of twenty-seven patients with medulloblastoma and eleven patients with cerebral PNET were reviewed, excluding tumors with significant cellular differentiation such as ependymoblastoma, pineoblastoma and neuroblastoma. The presence of glial fibrillary acidic protein(GFAP), neurofilament(NF), S-100 protein, vimentin, synaptophysin, and epithelial membrane antigen(EMA) was examined with immunohistochemical method and the differences of the results between the two tumors were statistically analyzed. The positive rates of NF and synaptophysin were significantly higher in medulloblastomas(p=0.006 and 0.003, respectively) and so was the positive rate of vimentin in cerebral PNET's(p=0.004). S-100 protein showed a higher positive rate in cerebral PNETs althought it was not statistically significant. Univariate and multivariate analyses did not show any significant correlation between the duration of survival and the presence of cellular antigens.
Classification ; Humans ; Immunohistochemistry ; Medulloblastoma ; Membranes ; Multivariate Analysis ; Neural Plate ; Neuroblastoma ; Neuroectodermal Tumors, Primitive* ; Pinealoma ; S100 Proteins ; Synaptophysin ; Vimentin

BACKGROUND: Aquaporin 1 (AQP1) overexpression has been shown to be associated with uncontrolled cell replication, invasion, migration, and tumor metastasis. We aimed to evaluate AQP1 expression in lung adenocarcinomas and to examine its association with clinicopathological features and prognostic significance. We also investigated the association between AQP1 overexpression and epithelial-mesenchymal transition (EMT) markers. METHODS: We examined AQP1 expression in 505 cases of surgically resected lung adenocarcinomas acquired at the Seoul National University Bundang Hospital from 2003 to 2012. Expression of AQP1 and EMT-related markers, including Ecadherin and vimentin, were analyzed by immunohistochemistry and tissue microarray. RESULTS: AQP1 overexpression was associated with several aggressive pathological parameters, including venous invasion, lymphatic invasion, and tumor recurrence. AQP1 overexpression tended to be associated with higher histological grade, advanced pathological stage, and anaplastic lymphoma kinase (ALK) translocation; however, these differences were not statistically significant. In addition, AQP1 overexpression positively correlated with loss of E-cadherin expression and acquired expression of vimentin. Lung adenocarcinoma patients with AQP1 overexpression showed shorter progression-free survival (PFS, 46.1 months vs. 56.2 months) compared to patients without AQP1 overexpression. Multivariate analysis confirmed that AQP1 overexpression was significantly associated with shorter PFS (hazard ratio, 1.429; 95% confidence interval, 1.033 to 1.977; p=.031). CONCLUSIONS: AQP1 overexpression was thereby concluded to be an independent factor of poor prognosis associated with shorter PFS in lung adenocarcinoma. These results suggested that AQP1 overexpression might be considered as a prognostic biomarker of lung adenocarcinoma.
Adenocarcinoma* ; Aquaporin 1* ; Cadherins ; Disease-Free Survival ; Epithelial-Mesenchymal Transition ; Humans ; Immunohistochemistry ; Lung* ; Lymphoma ; Multivariate Analysis ; Neoplasm Metastasis ; Phosphotransferases ; Prognosis* ; Recurrence ; Seoul ; Tissue Array Analysis ; Vimentin

BACKGROUND / PURPOSE: Hepatocellular carcinoma (HCC) is a common cancer with a poor prognosis. A better understanding of the molecular mechanisms underlying the genesis of HCC, as well as the progression of HCC, allow for improved prediction of the prognosis of patients with HCC and more effective treatment. In this study, we determined the expression of vimentin and matrix metalloproteinase 2 (MMP 2) and evaluated the clinical significance in (HCC). METHODS: Immunohistochemical staining was performed for vimentin and MMP 2 in 98 surgically resected HCC specimens using the tissue microarray method. The clinicopathologic data and the outcomes were reviewed, and the levels of expression of vimentin and MMP 2 were compared. RESULTS: Positive expression of vimentin and MMP 2 was observed in 7.1% and 41.8% of specimens, respectively. The overexpression of vimentin and MMP 2 had a positive correlation with tumor cell proliferative activity, as measured by the Ki-67 labeling index (p<0.001 and p=0.043, respectively), but was not correlated with the TUNEL labeling index. Other clinicopathological factors, such as platelet count, serosal invasion, Edomondson grade, capsule infiltration, TNM stage(UICC, 6th edition) and extrahepatic metastases in patients with recurrences had a significant correlation with vimentin. The presence of portal vein thrombosis approached statistical significance with MMP 2 expression. In the survival analysis, overexpression of vimentin and MMP 2 was correlated with a poor overall survival rate based on univariate analysis (p=0.002 and, p=0.047, respectively), but not based on multivariate analysis. CONCLUSION: In HCC, vimentin and MMP 2 may have a role in cancer progression with more aggressive potential, thus suggesting their use as a prognostic markers in HCC.
Carcinoma, Hepatocellular ; Humans ; Immunohistochemistry ; In Situ Nick-End Labeling ; Matrix Metalloproteinase 2 ; Multivariate Analysis ; Neoplasm Metastasis ; Platelet Count ; Portal Vein ; Prognosis ; Recurrence ; Survival Analysis ; Survival Rate ; Thrombosis ; Vimentin

Animals ; Desmin ; analysis ; genetics ; Female ; Immunohistochemistry ; Intermediate Filament Proteins ; analysis ; genetics ; Kidney Glomerulus ; chemistry ; Nephrosis ; metabolism ; Nerve Tissue Proteins ; analysis ; genetics ; Nestin ; Podocytes ; chemistry ; RNA, Messenger ; analysis ; Rats ; Rats, Inbred WKY ; Vimentin ; analysis ; genetics

Sporadic sclerotic fibroma (SF) and solitary fibrous tumor (SFT) arising in the oral cavity are very rare. In this report, we describe two cases of oral pathology, one involving SF and the other involving SFT. Both cases presented with well- circumscribed, firm nodules with similar gross findings. However, the histologic findings of the SF and SFT showed rather distinct features. The SF was composed of hyalinized sclerotic collagen bundles arranged in a whorled pattern, whereas the SFT was formed by spindles cells arranged in hypo- and hypercellular areas. The immunohistochemical findings were similar in both cases; there was positivity for vimentin, CD34, and CD99, but bcl-2 positivity was only seen in the SFT. Although their histopathologies are similar, SF and SFT should be considered in the differential diagnosis of soft tissue tumors in the oral cavity.
Adult ; Antigens, CD/analysis ; Antigens, CD34/analysis ; Cell Adhesion Molecules/analysis ; Diagnosis, Differential ; Female ; Fibroma/*diagnosis/metabolism ; Humans ; Immunohistochemistry ; Mouth/chemistry/*pathology ; Mouth Neoplasms/*diagnosis/metabolism ; Neoplasms, Fibrous Tissue/*diagnosis/metabolism ; Proto-Oncogene Proteins c-bcl-2/analysis ; Vimentin/analysis