Perinephric abscess with renal cell carcinoma

A case of perinephric abscess with renal cell carcinoma is presented. Hematuria is uncommon in cases of perinephric abscess. When hematuria is present in a patient with perinephric abscess further evaluation is necessary to rule out an associated malignant process.     

Advanced gastric carcinoma with signet ring cell carcinoma versus non-signet ring cell carcinoma: differentiation with multidetector CT

OBJECTIVE: The purpose of this study is to assess the capability of multidetector computed tomography (MDCT) to assist in the differentiation of advanced gastric carcinoma with signet ring cell type from that with non-signet ring cell carcinoma (NSRC) with a focus on the thickened stomach wall itself. METHODS: We retrospectively reviewed MDCT results in 80 patients with pathologically proven advanced gastric carcinoma with signet ring cell carcinoma (SRC) (n = 35) and NSRC (n = 45). MDCT images of 80 patients were analyzed retrospectively on gross appearance of thickened gastric wall (polypoid/fungating/ulcerative/diffuse infiltrative), predominantly thickened layer (inner/outer), contrast-enhancement pattern (nonlayered/layered) and degree of enhancement (high/moderate/low). RESULTS: The most common type of gross appearance in both carcinomas was fungating, and the more common contrast-enhancement pattern in both carcinomas was a nonlayered pattern. The predominantly thickened layer was a high attenuation inner layer in both carcinomas. High-degree contrast enhancement was more common in SRC (37.1% of patients) than NSRC (15.6% of patients) with statistically significant difference (P = 0.01). CONCLUSIONS: Multidetector CT cannot distinguish SRC from NSRC based on the thickened stomach wall alone. But, high-degree contrast enhancement was more common in advanced gastric carcinoma with SRC than that with NSRC.     

肾细胞癌MSCT灌注参数与细胞增殖活性的相关性研究

目的:探讨肾细胞癌螺旋CT灌注扫描参数与增殖细胞核抗原Ki-67的相关性.方法:选择24例经手术病理证实肾细胞癌患者与15例健康自愿者, 行肾区CT平扫后选择经肿瘤的最大层面或正常肾脏选肾门平面为靶平面再行同层动态增强扫描,经过灌注软件处理分析,分别获得肾癌组织及双侧肾皮质的血流量(BF)、相对血容比(rBV)、平均通过时间(TTP)、通透性(Pm) 及时间密度曲线(TDC图).24例肿瘤组织切片采用免疫组化方法(SP法)检测肾肿瘤Ki-67的表达.将所获灌注参数与免疫组化指标进行比较研究.结果:①各级别肾细胞癌间及肾细胞癌与正常肾皮质BF、rBV、Pm均有显著性差异.各级别肾细胞癌间及肾细胞癌与正常肾皮质TTP无显著性意义;②各级别肾细胞癌间Ki-67表达均有显著性意义;③CT灌注参数中,BF、rBV、Pm与肾细胞癌Ki-67有明显相关关系;TTP与Ki-67间无显著相关性.结论:MSCT灌注成像能定量检测肾细胞癌血流灌注和血管通透性改变, 有助于推测肾细胞癌的术前分级,评价肿瘤细胞增殖状态,为术前诊断及治疗提供依据.     

Dedifferentiated parosteal osteosarcoma with giant cell tumor component

Dedifferentiated parosteal osteosarcoma is characterized histologically by the admixture of low-grade fibroblastic osteosarcoma and a high-grade component typically resembling conventional osteosarcoma or malignant fibrous histiocytoma. We report an unusual distal femoral dedifferentiated parosteal osteosarcoma in which the dedifferentiated component resembled a giant cell tumor of bone. This phenotype is rarely described in the dedifferentiated component of a dedifferentiated parosteal osteosarcoma. The clinical, radiographic, and pathologic features of this unusual tumor are described to further expand the histologic spectrum of dedifferentiated parosteal osteosarcoma.     

Pancreatic serous cystadenoma associated with islet cell tumour

We report the case of a 29-year-old female patient with a diffuse type of serous cystadenoma involving the entire pancreas except for part of the head, which was replaced by islet cell tumour. Ultrasound and CT showed multiple cysts in the entire pancreas and a solid mass with calcification in the head. MRI characterized the fluid content of the cysts and the extent of disease.     

Bilateral ureteral pseudodiverticulosis with transitional cell tumour]

We present with a case of bilateral ureteral pseudodiverticulosis associated with a transitional cell tumour in the bladder. From a pathogenic point of view, there is currently a trend to consider reactive hyperplasia of transitional cell epithelium as secondary to chronic inflammatory processes which would form such pseudodiverticula. On account of that association it is advisable to perform follow-up tests on these patients to enable us to reach an early diagnosis of these tumours.     

Giant cell myocarditis associated with amoxicillin hypersensitivity reaction

We report a case of sudden unexpected death in an adult woman from florid myocarditis with necrosis, replacement fibrosis, and diffuse infiltration of the myocardium by eosinophils and conspicuous giant cells. Clinical history revealed that 3 weeks prior to death, shortly after commencing antibiotic therapy for the treatment of traumatic wound of a finger, she presented to the emergency room with a hypersensitivity reaction characterized by facial rash with edema and generalized pruritus. She was treated with antihistamines and discharged. The clinico-pathological correlation suggests a link between drug hypersensitivity and the giant cell myocarditis.     

Indoor radon measurement with The Lucas cell technique

Rn-222 is the most important source of natural radiation and is responsible for approximately half of the received dose from all sources. Most of this dose is from inhalation of the Rn-222 progeny, especially in closed atmospheres. A Lucas cell technique, using a portable device, “PRASSI” (SILENA mod. 5S), for Rn-222 measurements inside the Centre for Radiation Protection and Radioecology (ZSR), Hannover University was used. The portable radon monitor PRASSI is suitable for radon gas continuous or grab sampling measurements with the scintillation cell technique. In recognition of the wide periodic variations in concentration, measurements were made daily for extended periods. At the same time, meteorological variables, such as temperature and humidity were observed so that their influence on radon levels could be evaluated. The radon average concentration during the year was about 55.9 Bq/m³ which gives rise to an annual effective dose 2.2 mSv y⁻¹. The radon concentration is within the limits prescribed by the International Commission for Radiation Protection. A detailed analysis of radon distribution with seasonal variation is presented.     

肾透明细胞癌与肾嗜酸细胞腺瘤的CT鉴别诊断

目的探讨分析肾透明细胞癌与嗜酸细胞腺瘤的CT表现及鉴别诊断。方法选取我院收治并经手术病理证实为肾透明细胞癌(20例)及肾嗜酸细胞腺瘤(15例)的CT表现,分析两者病灶的大小、形态、密度、CT值及强化方式等。结果肾透明细胞癌与肾嗜酸细胞腺瘤病灶的直径差异不明显(P> 0.05),差异无统计学意义;肾透明细胞癌与嗜酸细胞腺瘤CT平扫均多数为等或稍低密度,增强期多表现为明显强化,但肾透明细胞癌的强化特点为快进快出型,而肾嗜酸细胞腺瘤为快进慢出型,且肾透明细胞癌可有淋巴结转移,而肾嗜酸细胞瘤可有中央瘢痕。结论综合分析肾透明细胞癌与肾嗜酸细胞腺瘤的CT平扫及增强扫描的影像学特点,有助于两者的鉴别诊断。     

Accelerated stem cell labeling with ferucarbotran and protamine

Objective

To develop and characterize a clinically applicable, fast and efficient method for stem cell labeling with ferucarbotran and protamine for depiction with clinical MRI.

Methods

The hydrodynamic diameter, zeta potential and relaxivities of ferucarbotran and varying concentrations of protamine were measured. Once the optimized ratio was found, human mesenchymal stem cells (MSCs) were labeled at varying incubation times (1–24 h). Viability was assessed via Trypan blue exclusion testing. 150,000 labeled cells in Ficoll solution were imaged with T1-, T2- and T2*-weighted sequences at 3 T, and relaxation rates were calculated.

Results

Varying the concentrations of protamine allows for easy modification of the physicochemical properties. Simple incubation with ferucarbotran alone resulted in efficient labeling after 24 h of incubation while assisted labeling with protamine resulted in similar results after only 1 h. Cell viability remained unaffected. R2 and R2* relaxation rates were drastically increased. Electron microscopy confirmed intracellular iron oxide uptake in lysosomes. Relaxation times correlated with results from ICP-AES.

Conclusion

Our results show internalization of ferucarbotran can be accelerated in MSCs with protamine, an approved heparin antagonist and potentially clinically applicable uptake-enhancing agent.     

卵巢卵泡膜细胞瘤的CT诊断

卵巢肿瘤种类较多,病理分类较复杂,可分为以下四类:上皮源性肿瘤、生殖细胞肿瘤、性索间质肿瘤和转移瘤。卵巢卵泡膜细胞瘤是起源于卵巢性索间质的良性肿瘤,恶性很少,占全部卵巢肿瘤的0.5%～1.0%,据有关文献报道不超过4%。临床表现无特异性,术前诊断不易。笔者收     

多囊性肾细胞癌与肾透明细胞癌囊性变的临床病理分析

目的 探讨多囊性肾细胞癌(MCRCC)临床病理特点及其与肾透明细胞癌囊性变(RCCCC)的预后差异.方法 1999～2003年收治的多囊性肾细胞癌21例,肾透明细胞癌囊性变11例,行根治性肾切除术或肾部分切除术.由两位病理医生独立观察,比较多囊性肾细胞癌和经典肾透明细胞癌伴有明显囊性变的病理特征和预后的差异.结果 21例MCRCC患者中,男性17例,女性4例,年龄37～67岁,平均年龄49岁.15例MCRCC患者有详细的随访资料,随访时间为31～73个月,患者平均生存时间为61个月,无复发或转移.7例有随访资料的RCCCC病例平均存活32个月(随访时间为18～63个月),两组间比较有显著性差异(P＜0.05).组织学上多囊性肾细胞癌多数界限清楚,周围有较厚的包膜,瘤体内实性成分较少,由多个互不相通、大小不一的囊腔组成,Fuhrman核分级多数为1级;而肾透明细胞癌囊性变病例可见明显的实性区域,由典型的透明细胞组成,其中可见大小不一的囊腔,囊腔之间为透明细胞,无多囊性肾细胞癌的纤维组织囊壁.结论 由于MCRCC具有良性肿瘤特征和特殊的病理学表现,其临床预后明显好于RCCCC,对怀疑并证实MCRCC者应该考虑施行保留肾单位手术.