ObjectivesTo emphasize the importance of considering solitary fibrous tumor (SFT) in the differential diagnosis of sublingual gland masses, particularly those presenting with unusual symptoms like tongue deviation.MethodsA case of a 41-year-old female with a painless sublingual mass and tongue deviation was analyzed. Clinical presentation, imaging, surgical management, histopathological findings, immunohistochemical results, and follow-up were systematically reviewed. Management consisted of complete surgical excision of the sublingual gland and the tumor, with preservation of the lingual and hypoglossal nerves.ResultsHistopathology revealed haphazardly arranged spindle cells with characteristic staghorn-shaped blood vessels. Immunohistochemical analysis confirmed strong nuclear STAT6 and diffuse CD34 positivity, consistent with SFT. The patient remained recurrence-free at 18 months postoperatively, although tongue deviation persisted.Conclusionssublingual gland SFTs are exceptionally rare and may mimic malignancies. Benign tumors such as SFT should be considered in the differential diagnosis of sublingual masses. Definitive diagnosis depends on histopathological and immunohistochemical confirmation. Complete surgical excision offers a favorable prognosis.

Solitary fibrous tumor (SFT) is a fibroblastic tumor characterized by a prominent staghorn vasculature and collagen deposition. However, little is known about SFTs with alveolar structures. Herein, we present a case of an alveolar pattern SFT in a 55-year-old woman. The tumor was present in the lumbosacral spinal canal and showed an alveolar architecture composed of ovoid to spindle-shaped cells. Immunohistochemical examination showed that the tumor cells were positive for STAT6 (nuclear expression), CD34, CD99, and Bcl-2, but negative for cytokeratins (CK-pan and AE1/AE3), EMA, GFAP, CD31, progesterone receptor, S-100 protein, and smooth muscle actin. Furthermore, NAB2::STAT6 fusion was detected using DNA-based next-generation sequencing, which established the diagnosis of SFT at a molecular level. The present case expands the morphological categories of SFT.

Disulfidptosis refers to a specific programmed cell death process characterized by the accumulation of disulfides. It has recently been reported in several cancers. However, the impact of disulfidptosis-related long non-coding RNAs (lncRNAs) on malignant tumors has remained largely unknown. In the present work, we screened prognostic disulfidptosis-related lncRNAs and studied their effects on lung adenocarcinoma. Relevant clinical data of lung adenocarcinoma cases were retrieved from The Cancer Genome Atlas (TCGA) database. RNA sequencing was used to identify differentially expressed disulfidptosis-related lncRNAs within lung adenocarcinoma. In addition, prognostic disulfidptosis-related lncRNAs were obtained through univariate Cox regression analysis. LASSO-COX was used to construct new disulfidptosis-related lncRNA signatures. Different statistical approaches were used to validate the practicability and accuracy of the disulfidptosis-related lncRNAs signatures. Furthermore, several bioinformatic approaches were used to study relevant heterogeneities in biological processes and pathways of diverse risk groups. Reverse transcriptase-quantitative polymerase chain reaction (RT-qPCR) was conducted to analyze the expression of disulfidptosis-related lncRNAs. Finally, seven disulfidptosis-related lncRNA signatures were identified in lung adenocarcinoma cells. The prognosis prediction model constructed efficiently predicted patient survival. Subgroup analysis revealed significant differences in immune cell proportion, including T follicular helper cells and M0 macrophages. In addition, in vitro experimental results demonstrated significant differences in disulfidptosis-related lncRNAs. Altogether, the six disulfidptosis-related lncRNA signatures could serve as a potential prognostic biomarker for lung adenocarcinoma. Furthermore, these can be used as a prediction model in individualized immunotherapy for lung adenocarcinoma.

Background: The status of the lung adenocarcinoma (LUAD) grading system and the association between LUAD differentiation, driver genes, and clinicopathological features remain to be elucidated. Methods: We included patients with invasive non-mucinous LUAD, evaluated their differentiation, and collected available clinicopathological information, gene mutations, and analyzed clinical outcomes. Results: Among the 907 patients with invasive non-mucinous LUAD, 321 (35.4 %) were poorly differentiated, 422 (46.5 %) were moderately differentiated, and 164 (18.1 %) were well differentiated. EGFR mutation was more common in the LUADs accompanied without CGP (complex glandular pattern) than LUADs with CGP (p < 0.001). Correlation analysis between mutations and clinical characteristics showed that EGFR gene mutation (p < 0.001), KRAS gene mutation (p < 0.05), and ALK gene rearrangement (p < 0.001) were significantly related to the degree of tumor differentiation, and the KRAS and ALK gene mutation frequencies were higher in the low-differentiation group than in the high and medium differentiation groups. The EGFR mutation frequency was higher in the well/moderately differentiated adenocarcinoma group. Conclusions: Our study adds to the evidence regarding the role of the grading system in prognosis. EGFR , KRAS , and ALK are related to the degree of tumor differentiation.

Objective: To investigate the clinicopathological features, immunophenotype, and genetic alterations of rectal adenocarcinoma with enteroblastic differentiation. Methods: Four cases of rectal adenocarcinoma with enteroblastic differentiation were collected at the Affiliated Hospital of Qingdao University, Qingdao, China (three cases) and Yantai Yeda Hospital of Shandong Province, China (one case) from January to December 2022. Their clinical features were summarized. Hematoxylin and eosin stain and immunohistochemical stain were performed, while next-generation sequencing was performed to reveal the genetic alterations of these cases. Results: All four patients were male with a median age of 65.5 years. The clinical manifestations were changes of stool characteristics, bloody stools and weight loss. All cases showed mixed morphology composed of conventional adenocarcinoma and adenocarcinoma with enteroblastic differentiation. Most of the tumors consisted of glands with tubular and cribriform features. In one case, almost all tumor cells were arranged in papillary structures. The tumor cells with enteroblastic differentiation were columnar, with relatively distinct cell boundaries and characteristic abundant clear cytoplasm, forming fetal gut-like glands. Immunohistochemically, the tumor cells were positive for SALL4 (4/4), Glypican-3 (3/4) and AFP (1/4, focally positive), while p53 stain showed mutated type in 2 cases. The next-generation sequencing revealed that 2 cases had TP53 gene mutation and 1 case had KRAS gene mutation. Conclusions: Rectal adenocarcinoma with enteroblastic differentiation is rare. It shows embryonal differentiation in morphology and immunohistochemistry, and should be distinguished from conventional colorectal adenocarcinoma.

Salivary gland–type intraductal carcinoma (IC) is a rare malignant salivary gland neoplasm. Primary salivary gland–type IC has never been described in the lung. Herein, we present a primary pulmonary IC in a 63-year-old woman. The tumor originated in the bronchus wall of the right middle lobe. The tumor consisted of two histological types, intercalated component and oncocytic component. The intercalated component showed tubular/cystic pattern composed of column to cube-shaped cells and scattered mucous cells. The oncocytic component showed solid nests composed of large cells with abundant eosinophilic granular cytoplasm. Immunohistochemically, both histological components were positive for cytokeratin 7 (CK7), S-100 protein, SOX10, and mammaglobin. The rimming myoepithelial cells were highlighted by p63 and smooth muscle actin (SMA). The tumor cells were negative for androgen receptor (AR), HER-2, Dog-1, TTF-1, napsin A, GCDFP-15, and GATA3. In the present case, we detected KIAA1217::RET fusion via DNA-based next-generation sequencing (NGS) and RT-PCR, which established the diagnosis of IC at a molecular level. The present case expands the categories of bronchopulmonary salivary gland–type tumors.

目的 探讨甲状腺筛状桑葚型乳头状癌(CMV-PTC)的临床病理、免疫表型和分子学特征.方法 收集海军第九七一医院和青岛大学附属医院诊断的2 例CMV-PTC 患者的临床资料,通过形态学观察、免疫组织化学染色以及分子学检测分析该亚型甲状腺乳头状癌的临床病理学及分子学特点,并复习相关文献.结果 2 例患者均为女性,年龄分别23 和27 岁,肿瘤分别位于甲状腺左叶和右叶.巨检:结节样肿物,直径分别为2.3 cm 和4 cm,均边界清楚,有完整包膜,切面灰白、灰红、实性.镜检:2 例瘤组织均主要呈筛状、乳头状(60％)及实性片状排列,1例并可见多量管状结构,瘤细胞胞质浅嗜酸,边界不清,核圆形或不规则,染色质均匀细颗粒状,部分可见核沟或核内包涵体.1 例实性区瘤细胞密集,短梭形,核分裂象易见.瘤组织内均散在多少不一具有毛玻璃样核或同心圆状的桑葚样结构.瘤组织均巢团状侵及包膜,并见脉管内瘤栓形成.免疫组化染色显示,2 例瘤细胞及桑葚体均呈Galectin-3 和β-catenin 阳性,Vimentin、CK19、TTF-1 和ER 仅在肿瘤细胞表达;CDX-2 和HBME-1 仅在桑葚体结构表达;Ki-67 指数≤5％.分子学检测:2 例均未检测到K-ras、N-ras、B-raf(V600E)和PIK3CA 突变.结论 CMV-PTC是一种与家族性大肠腺瘤样息肉病(FAP)和Gardner综合征密切相关的罕见甲状腺乳头状癌亚型,具有独特性的形态学、免疫表型和分子学特点,总体预后大多良好.及时准确的病理诊断对患者及其亲属相关病变的早期发现、及时治疗具有重要的临床意义.

The fetal gut-like phenotype can be found in yolk sac tumors and adenocarcinomas with enteroblastic differentiation (AEBDs). We report a cervical yolk sac tumor in a 44-yr-old woman. The tumor has similar morphology, immunophenotype, and molecular features to the AEBD of the digestive system. The tumor showed a glandular-predominant growth pattern, composed of columnar cells with clear glycogen-rich cytoplasm. The microcystic/reticular architecture or Schiller-Duval bodies were not found in the tumor. Immunohistochemically, the tumor cells were positive for p16, glypican-3 (GPC3), spalt-like transcription factor 4 (SALL4), CDX-2, and p53. TP53 mutation was identified by next-generation sequencing, and human papillomavirus (HPV) 35 was detected by HPV DNA polymerase chain reaction. In the present case, the adenocarcinoma cells in the superficial cervical glandular epithelium and the nonclear glandular components proved the existence of somatic components. The positivity of p16 and HPV also supports that the present case originates from an HPV-associated adenocarcinoma. The yolk sac tumor should be thought of as "germ cell differentiation" from a somatic carcinoma. This kind of yolk sac tumor arising from somatic-type adenocarcinoma in the female genital tract may be the counterpart of AEBD in the digestive tracts and adenocarcinomas with fetal gut-like morphology in other organs. The tumor might be more aggressive than conventional adenocarcinoma, pathologists should highlight the existence of the enteroblastic component in the pathologic report.

Li-Fraumeni综合征（Li-Fraumeni syndrome，LFS）是一种罕见的家族性常染色体显性遗传肿瘤易感综合征，LFS谱系肿瘤包括骨与软组织肉瘤、中枢神经系统肿瘤、绝经前乳腺癌、白血病、肾上腺皮质肿瘤和肺腺癌。LFS家系基因分析显示，约70%的LFS存在TP53基因胚系突变。本文回顾性分析1例以多原发恶性肿瘤为临床表现的LFS患者的临床病理特点、基因检测及预后情况，以期提高对该疾病的认识。

Pulmonary bronchiolar adenoma (BA) is a rare lung tumour, it is unclear whether BA can develop into a malignancy. We presented five cases of BA-like tumour with monolayered components. This type of tumour may represent the malignant transformation of BA. Histologically, these tumours showed acinar and lepidic growth patterns. The acinar components were well-differentiated. The glandular tumour cells in these tumours contained cuboidal to columnar cells resembling type II pneumocytes or club (Clara) cells. A small number of mucinous cells were found in two cases. A few scattered ciliated cells were detected in three cases. The ciliated cells only existed in the bilayered components. The basal cells were highlighted by CK5/6 and p40 in a partial region of the tumour rather than in the entire tumour. The glandular tumour cells, including those in the bilayered component, were diffusely positive for TTF-1 and napsin-A. EGFR Exon19 deletions were found in four cases, and BRAF V600E mutation was found in one case. These BA-like tumours have biphasic morphological and molecular characteristics of BA and lung adenocarcinoma, suggesting distal-type BA may develop into a malignancy. More cases should be studied and especially cases with metastasis should be searched to further prove the malignant transformation.

患者女性,68岁,因左侧腮腺区肿物1 年入院.1 年前出现左眼无法闭合、嘴角歪斜,半年前发现左侧腮腺区有一约花生米大小肿物,增长迅速伴疼痛.入院后查体:左侧耳垂前下方扪及一质硬包块,活动度欠佳.B超示左侧腮腺内见低回声区,大小4. 0 cm × 3. 7 cm × 3. 0 cm,形态不规则,边界不清.

目的 探讨肾上腺碰撞瘤(ACTs)的临床病理特征,进一步认识此类病变.方法 回顾性分析青岛大学附属医院及海军第九七一医院2009-2019年手术切除标本诊断ACTs 12例,采用HE观察组织形态学及免疫表型,并进行随访及复习相关文献.结果 12例ACTs者中,男7例,女5例,发病年龄44～73岁(中位年龄58岁).9例无症状,为体检时CT偶然发现,2例有高血压病史,1例有糖尿病病史.影像学检查均提示肾上腺占位.组织学上,11例为肾上腺皮质腺瘤分别合并髓脂肪瘤(7例)、嗜铬细胞瘤(3例)、血管瘤(1例),1例为髓脂肪瘤并节细胞神经瘤.12例患者均行肿物手术切除,术后随访4～ 120个月,均无复发、转移.结论 ACTs少见,临床和影像学检查无特异性.大多为肾上腺皮质腺瘤和其他不同组织类型的良性肿瘤的混合,以皮质腺瘤合并髓脂肪瘤最多见,手术完整切除后,预后良好.

目的:分析柱状细胞型甲状腺乳头状癌（columnar cell variant of papillary thyroid carcinoma，CCV-PTC）的临床病理特征及预后，并着重探讨甲状腺癌常见驱动基因突变状态。方法:回顾性分析7例CCV-PTC的临床资料及组织学形态，EnVision法进行免疫表型分析，突变阻滞扩增系统（ARMS）-PCR检测BRAF V600E基因突变，Sanger测序检测RAS及端粒酶逆转录酶基因（TERT）启动子基因突变。结果:男性4例，女性3例，年龄29~65岁。组织学肿瘤细胞呈柱状、假复层排列，7例均表达甲状腺滤泡上皮标记，1例表达CDX2，p53均呈野生型表达。4例存在BRAF V600E突变（4/7），4例存在TERT启动子突变（4/5），5例均未见RAS突变（0/5）。术后随访8~89个月，4例出现肿瘤复发，2例死亡。结论:CCV-PTC以柱状肿瘤细胞假复层排列为特征，可表达CDX2，具有较高的BRAF V600E及TERT启动子突变率，浸润性生长者预后较差。

Goblet cell adenocarcinoma (GCA) is a rare amphicrine tumor and difficult to diagnose. GCA is traditionally found in the appendix, but extra-appendiceal GCA may be underestimated. Intestinal adenocarcinoma with signet ring cell component is also very rare, and some signet ring cell carcinomas are well cohesive, having some similar morphological features to GCAs. It is necessary to differentiate GCA from intestinal adenocarcinomas with cohesive signet ring cell component (IACSRCC). The goal of this study is to find occurrence of extra-appendiceal GCA and characterize the histological, immunohistochemical, transcriptional, and immune landscape of GCA. We collected 12 cases of GCAs and 10 IACSRCCs and reviewed the clinicopathologic characters of these cases. Immunohistochemical stains were performed with synaptophysin, chromogranin A, CD56, somatostatin receptor (SSTR) 2, and Ki-67. Whole transcriptome RNA-sequencing was performed, and data were used to analyze differential gene expression and predict immune cell infiltration levels in GCA and IACSRCC. RNA-sequencing data for colorectal adenocarcinoma were gathered from TCGA data portal. Of the 12 patients with GCA, there were 4 women and 8 men. There were three appendiceal cases and nine extra-appendiceal cases. GCAs were immunohistochemically different from IACSRCC. GCA also had different levels of B-cell and CD8+ T-cell infiltration compared to both colorectal adenocarcinoma and cohesive IACSRCCs. Differential gene expression analysis showed distinct gene expression patterns in GCA compared to colorectal adenocarcinoma, with a number of cancer-related differentially expressed genes, including upregulation of TMEM14A, GOLT1A, DSCC1, and HSD17B8, and downregulation of KCNQ1OT1 and MXRA5. GCA also had several differentially expressed genes compared to IACSRCCs, including upregulation of PRSS21, EPPIN, RPRM, TNFRSF12A, and BZRAP1, and downregulation of HIST1H2BE, TCN1, AC069363.1, RP11-538I12.2, and REG4. In summary, the number of extra-appendiceal GCA was underestimated in Chinese patients. GCA can be seen as a distinct morphological, immunohistochemical, transcriptomic, and immunological entity. The classic low-grade component of GCA and the immunoreactivity for neuroendocrine markers are the key points to diagnosing GCA.

BACKGROUND:Morule-like component (MLC) was a rare structure in primary lung adenocarcinoma. We aimed to reveal the clinicopathological, radiological, immunohistochemical, and molecular features of lung adenocarcinoma with MLCs.METHODS:Twenty lung adenocarcinomas with MLCs were collected, and computed tomographic and histological documents were reviewed. Immunohistochemistry, targeted next-generation sequencing, and Sanger sequencing for β-catenin gene were performed.RESULTS:There were 9 lepidic adenocarcinomas, 8 acinar adenocarcinomas, 2 papillary adenocarcinomas, and 1 minimally invasive adenocarcinoma. Most patients (16/17) were shown a pure solid nodule, and 1 patient was shown a partly solid nodule on chest computed tomography (CT). Nine cases were accompanied with micropapillary components, and 3 were with cribriform components in which 2 suffered a worse prognosis. No significant association was found between the MCLs and the overall survival of lung adenocarcinoma (P = 0.109). The MLCs were often arranged in whorled or streaming patterns. The cells in MLCs showed syncytial and mild appearance. The MLCs were positive for E-cadherin, CK7, TTF-1, napsin-A, vimentin, and β-catenin (membrane), and negative for CK5/6, p40, p63, Synaptophysin, chromogranin A, and Cdx-2. EGFR mutation, ALK-EML4 fusion, HER2 amplification, and PIK3CA mutation were detected in 16 cases, 2 cases, 1 case, and 1 case, respectively. EGFR mutation was more frequent in adenocarcinomas with MLCs than those without MLCs (P = 0.040). β-catenin gene mutation was not detected in any patients.CONCLUSIONS:MLC is often observed in the background of acinar, lepidic, and papillary adenocarcinomas. Lung adenocarcinomas with MLCs tend to appear as a solid mass on CT and harbor EGFR gene mutations. The micropapillary components and cribriform components may cause poor prognosis of lung adenocarcinomas with MLCs. Vimentin is always positive in MLCs, and it is a useful marker for the identification of MLCs.

Objective This study aimed to compare the clinical features of pulmonary cryptococcosis (PC) in patients with and without central nervous system (CNS) involvement. Methods We retrospectively reviewed demographics, presenting symptoms, radiographic features, and laboratory findings of patients diagnosed with PC in 28 hospitals from 2010 to 2019. Risk factors for CNS involvement were analyzed using logistic regression models. Result A total of 440 patients were included, and 36 (8.2%) had CNS involvement. Significant differences in fever, headache, and chills occurred between the two groups (overall and with/without CNS involvement) for fever (17.8% [78/440]; 52.8% vs. 14.6% of patients, respectively), headache (4.5% [20/440]; 55.6% vs. 0% of patients, respectively), and chills (4.3% [19/440]; 13.9% vs. 3.5% of patients, respectively). The common imaging manifestation was nodules (66.4%). Multivariate analysis showed that cavitation (adjusted odds ratio [AOR] = 3.552), fever (AOR = 4.182), and headache were risk factors for CNS involvement. Routine blood tests showed no differences between the groups, whereas in cerebrospinal fluid the white blood cell count increased significantly and glucose decreased significantly. Conclusion In patients with PC, the risk of CNS involvement increases in patients with headache, fever, and cavitation; these unique clinical features may be helpful in the diagnosis.

目的 探讨卵巢微囊性间质肿瘤(MCST)的临床病理学特征、鉴别诊断及预后.方法 收集2例卵巢MCST,观察其临床病理学特征及免疫表型,并复习相关文献.结果 肿瘤细胞呈分叶、巢状分布,细胞巢之间为玻璃样变的间质,肿瘤细胞巢内见囊性腔隙,少部分区域由实性的细胞巢构成;其中例1细胞核圆形或卵圆形,染色质细腻,核仁不明显;例2细胞异型明显,并见多核肿瘤细胞及瘤巨细胞,染色质呈细颗粒状,核仁明显,但核分裂象罕见.免疫组化:2例均为WT-1、CD10、β-catenin、cyclinD1和vimentin(+),其中例2 calretinin部分(+),Ki-67阳性指数＜5％.结论 MCST是一种罕见的卵巢良性肿瘤,诊断需要临床、组织病理学和免疫组化特点综合考虑.

Background The status of targeted genes and the association between targeted genes and clinicopathological features in Chinese lung cancer patients remains to be elucidated. Methods The status of 10 targeted genes was evaluated by next‐generation sequencing (NGS) in 884 non‐small cell lung cancer (NSCLC) patients. The relationship between gene alterations and clinicopathological characters was analyzed. Results Overall, 684 (77.4%) patients harbored gene alterations, and EGFR (510, 57.7%) was found to be the most common type of mutation followed by KRAS (91, 10.3%), HER2 (38, 4.3%), PIK3CA (32, 3.6%), ALK (21, 2.4%), BRAF (10, 1.1%), ROS1 (5, 0.6%), RET (5, 0.6%), MET (4, 0.5%) and NRAS (1, 0.1%). Gene alterations were more frequent in females, non‐smokers and adenocarcinoma (P < 0.001). EGFR mutations were associated with women, non‐smokers, normal level of serum tumor markers, and adenocarcinoma (P < 0.001). Patients without lymph node metastasis (P = 0.012), or early stage disease (P < 0.001) exhibited a higher EGFR mutation rate. KRAS mutations tended to arise in men (P < 0.001), smokers (P < 0.001) and patients with higher levels of serum tumor markers (P = 0.048). A mucus‐producing component was associated with KRAS (P < 0.001), ROS1 (P = 0.033) and ALK (P < 0.001) alterations. ALK and ROS1 rearrangements were more frequent in micropapillary structures (P = 0.004, P = 0.012). BRAF mutation was associated with advanced disease patients and micropapillary structure (P < 0.001). PIK3CA mutation was more likely to be found in elderly patients (P = 0.014). Some patients had synchronous gene alterations, including EGFR/PIK3CA, EGFR/HER2, HER2/KRAS, EGFR/KRAS, EGFR/ROS1, EGFR/NRAS, KRAS/PIK3CA, KRAS/PIK3CA/HER2. Conclusions Most patients had at least one genetic alteration, and individual patients harbored synchronous mutation. Each gene alteration had unique clinicopathological characteristics. Key points Significant findings of the study This study revealed the frequency and distribution of 10 targeted gene abnormalities and their association with clinicopathological parameters of Chinese non‐small cell lung cancer (NSCLC) patients in eastern China. What this study adds Some rare synchronous mutations were detected in our study by next‐generation sequencing (NGS).

Background:Detailed catalog of lung cancer-associated gene mutations provides valuable information for lung cancer diagnosis and treatment. In China, there has never been a wide-ranging study cataloging lung cancer-associated gene mutations. This study aims to reveal a comprehensive catalog of lung cancer gene mutations in china, focusing on EGFR, ALK, KRAS, HER2, PIK3CA, MET, BRAF, HRAS, and CTNNB1 as major targets. Additionally, we also aim to correlate smoking history, gender, and age distribution and pathological types with various types of gene mutations. Patients and Methods:A retrospective data acquisition was conducted spanning 6 years (2013-2018) among all patients who underwent lung cancer surgeries not bronchial or percutaneous lung biopsy at three major tertiary hospitals. Finally, we identified 1,729 patients who matched our inclusion criteria. Results:1081 patients (62.49%) harbored EGFR mutation. ALK (n= 42, 2.43%), KRAS (n= 201, 11.62%), CTNNB1 (n= 28, 1.62%), BRAF (n= 31, 1.79%), PIK3CA (n= 51, 2.95%), MET (n= 14, 0.81%), HER2 (n= 47, 2.72%), HRAS (n= 3, 0.17%), and other genes(n= 232, 13.4%). Females expressed 55.38% vs. males 44.62% mutations. Among subjects with known smoking histories, 32.82% smokers, 67.15% non-smokers were observed. Generally, 51.80% patients were above 60 years vs. 48.20% in younger patients. Pathological types found includes LUADs 71.11%, SQCCs 1.68%, ASC 0.75%, LCC 0.58%, SCC 0.35%, ACC 0.17%, and SC 0.06%, unclear 25.19%. Conclusion:We offer a detailed catalog of the distribution of lung cancer mutations. Showing how gender, smoking history, age, and pathological types are significantly related to the prevalence of lung cancer in China.

Solid pseudopapillary neoplasm (SPN) is a rare and low malignant potential neoplasm that traditionally occurs in pancreas. Herein, we report a mediastinal SPN in a 62-year-old woman. Clinically, the patient was asymptomatic. A mass in posterior mediastinum was detected by chest computerized tomographic (CT) scan during her annual checkup. The CT scan revealed a 30 mm solid nodule with well-defined outline in right posterior mediastinum. Histologically, the tumor was comprised of solid cellular nests as well as sheets of cells with an epithelioid appearance, and some pseudopapillary areas could also be identified. Immunohistochemically, the tumor cells were positive for β-catenin (nuclear and cytoplasmic), cyclin D1, CD56, CD10, CD99 (paranuclear dot-like), SOX11 (weak) and TFE3, while negative for cytokeratin (AE1/AE3), E-cadherin, WT-1, synaptophysin, chromogranin and progesterone receptor. SPNs can occur in aberrant locations and this is the first one reported in mediastinum, pathologists should learn about the rare case for a better differential diagnosis. The patient underwent a video-assisted thoracoscope tumorectomy. She has been followed up for 5 months with no recurrence or metastasis.