The Possibility of Acute Drug-Induced Liver Injury Associated With Prednisolone.

A female patient was referred to our hospital with complaints of liver injury. She had been treated for immunoglobulin (Ig)A nephropathy using prednisolone and other medications. Drug-induced liver injury (DILI) was suspected, as no evidence of viral infection or autoimmune liver disease was apparent. All medications except for prednisolone were discontinued, but liver enzyme levels remained elevated. Percutaneous liver biopsy showed the characteristics of DILI and drug lymphocyte stimulation testing yielded positive results for prednisolone. After stopping administration of prednisolone, liver enzyme levels recovered to near-normal. Prednisolone has immunosuppressive effects and is sometimes used to treat DILI. Some reports have revealed that high-dose corticosteroids can induce liver injury, but liver injuries associated with low-dose corticosteroid therapy have not been described. Prednisolone-induced liver injury is a rare phenomenon. When low-dose corticosteroids are used for treatment, care should be taken regarding the possibility of liver injury.

Bleeding From a Ruptured, Extraluminally Growing Gastric Gastrointestinal Stromal Tumor Treated by Transcatheter Arterial Embolization: A Case Report.

A 49-year-old man with abdominal pain was referred to our hospital. Abdominal computed tomography showed an extraluminal tumor near the gastric anterior wall and intra-abdominal fluid collection. A ruptured intra-abdominal tumor was suspected, and emergency abdominal angiography was performed. Hemorrhage into the abdominal cavity was seen, and transcatheter arterial embolization (TAE) was performed, which stopped the bleeding. The tumor was surgically resected, and a diagnosis of an extraluminally growing gastric gastrointestinal stromal tumor was made. TAE should be considered for rare cases of extraluminally growing tumors with intra-abdominal hemorrhage.

A giant liposarcoma originating from peripancreatic fat tissue with identification using 3D-CT angiography: a case report.

BACKGROUND: Liposarcoma originating from peripancreatic fat tissue is extremely rare. This case report presents a surgical case of a giant liposarcoma originating from peripancreatic fat tissue with origin identification using 3-Dimensional Computed Tomography Angiography (3D-CTA). CASE PRESENTATION: A 59-year-old female was referred to our hospital with a giant abdominal tumor. Computed tomography revealed a 34 cm tumor composed of fatty tissue, exerting pressure on the posterior aspect of the pancreas. Suspecting liposarcoma, we planned for surgery. At first, the tumor appeared to be intra-abdominal tumor, based on the identification of the tumor's feeding artery as a branch of the dorsal pancreatic artery using 3D-CTA, we concluded that the liposarcoma originated from the peripancreatic fat tissue and situated in the retroperitoneum. During surgery, we observed a well-capsulated, elastic, yellowish mass without infiltration into surrounding tissues. We carefully dissected the tumor from the greater omentum and transverse mesocolon while preserving the tumor capsule. We ligated the feeding artery at the border with the pancreatic parenchyma and successfully completed the excision of the tumor. The resected specimen weighted 2620 g and was pathologically diagnosed as a well-differentiated liposarcoma. There was no injury to the tumor's capsule, and the surgical margins were negative. CONCLUSIONS: In this report, we present an extremely rare case of a liposarcoma originating in the peripancreatic fat tissue. The use of 3D-CTA was instrumental in identifying the primary site of this giant tumor, enabling us to guide the surgery and achieve complete resection successfully.

Angiomatous meningioma associated with rapidly aggravated peritumoral leptomeningitis: A case report.

Background: A special type of meningioma is known to have infiltrated inflammatory cells within the tumor, associated with peritumoral inflammation. However, there have been no reports of meningioma with inflammatory response only around the tumor, without inflammatory cells within the tumor itself. Case Description: A 70-year-old woman presented with transient right hemiparesis due to an extra-axial tumor on the left frontal convexity. The tumor appeared hypointense on T1-weighted magnetic resonance images and hyperintense on T2-weighted images without peritumoral edema, and was homogenously enhanced associated with the peritumoral leptomeningeal enhancement. Cerebrospinal fluid examination showed an increase in the number of inflammatory cells with a predominance of mononuclear cells. During the following 1 month, the tumor size was unchanged, but the peritumoral leptomeningeal enhancement was remarkably enlarged with uncontrolled focal seizures. The tumor was subtotally removed and semisolid substances in the subarachnoid space were biopsied. Pathological examination with immunostaining revealed angiomatous meningioma: the tumor had no inflammatory cell infiltration within it, but was associated with the infiltration of immunoglobulin G4-negative lymphocytes into the border zone between the tumor and the dura mater, as well as numerous neutrophils and fibrinous exudates in the peritumoral subarachnoid space. The tumor removal rapidly improved the leptomeningeal enhancement and inflammatory reactions. Conclusion: The authors reported the first case of angiomatous meningioma associated with massive peritumoral inflammation without inflammatory infiltrates within the tumor itself.

A case of primary renal oncocytic tumor: Chromophobe renal cell carcinoma or oncocytoma?

Introduction: "Other oncocytic renal tumors of the kidney" is a new category constituted by 2022 WHO classification and different in the point of morphology and immunohistochemistory from typical oncocytic/eosinophilic renal tumors including chromophobe renal cell carcinoma and oncocytoma. Case presentation: The patient was an 84-year-old woman in whom a left renal tumor was incidentally discovered. She underwent left nephrectomy, and the pathological specimens showed a borderline eosinophilic renal tumor between chromophobe renal cell carcinoma and renal oncocytoma. After all recognized oncocytic tumors were excluded, we diagnosed the tumor as other oncocytic renal tumor of the kidney. Conclusion: Other oncocytic renal tumor of the kidney is a provisional category. Therefore, further research and accumulation of similar cases are necessary.

Hepatic Injury without Granulomatous Formation Associated with Intravesical Bacillus Calmette-Guérin Therapy.

A 74-year-old man developed hepatic injury after intravesical Bacillus Calmette-Guérin (BCG) therapy for bladder carcinoma. Although hepatitis-associated disseminated BCG was suspected, granulomatous formations were undetectable. The hepatic injury was considered to have resulted from an allergic reaction to BCG therapy because a histopathological assessment revealed enlarged portal areas with eosinophils and neutrophils. The hepatic injury was resolved by prednisolone. This case suggested that hepatic injury associated with BCG therapy might be due to an allergic mechanism unrelated to disseminated BCG disease. A liver biopsy is needed to confirm the histopathological findings of hepatic injury after BCG therapy in order to differentiate allergic hepatic injury from infectious hepatic injury.

Usefulness of Endoscopic Transpapillary Tissue Sampling for Malignant Biliary Strictures and Predictive Factors of Diagnostic Accuracy.

BACKGROUND/AIMS: It is sometimes difficult to distinguish between malignant and benign biliary strictures using imaging studies alone, and pathological diagnosis is necessary. The aim of this study was to determine the usefulness of endoscopic transpapillary tissue sampling and factors predictive of diagnostic accuracy. METHODS: From April 2008 to December 2014, 136 patients underwent endoscopic transpapillary tissue sampling for malignant biliary strictures. The cytological and histological findings were reported as negative, suspicious, or positive. Suspicious and positive findings were defined as pathologically positive. RESULTS: The sensitivity was 65.0% for forceps biopsy, 49.5% for brush cytology, 46.2% for bile aspiration cytology, and 21.9% for endoscopic nasobiliary drainage cytology. The combination of these procedures improved the sensitivity (72.8%). Endoscopic transpapillary tissue sampling was more sensitive for lesions of biliary origin (91.4%) than for extrabiliary lesions (66.3%). In surgical cases, the sensitivity for tumors with an infiltrative growth pattern (53.3%) was significantly lower than for a tumor with an expanding or intermediate growth pattern (87.5%). CONCLUSIONS: Combining procedures can improve diagnostic accuracy. It may be possible to predict the sensitivity of endoscopic transpapillary tissue sampling by evaluating the etiology and tumor growth pattern using preoperative imaging studies.

Spontaneous Tumor Lysis Syndrome in a Patient with a Dedifferentiated Endometrial Adenocarcinoma.

Tumor lysis syndrome (TLS) is an oncological emergency caused by massive cytolysis of malignant cells. This syndrome eventually induces metabolic abnormalities. TLS is observed mainly among tumors with rapid cell proliferation or high sensitivity to antineoplastic treatment. In rare cases, TLS occurs without any cytotoxic treatment. Previous reports have shown that alternative stress including proceeding infection or an operation might play a role in TLS. However, exact mechanism of spontaneous TLS remains unknown. Here, we describe a case of a 59-year-old woman who presented with dedifferentiated endometrial adenocarcinoma and developed TLS without any cytotoxic chemotherapy. Although spontaneous TLS in solid malignancies are extremely rare, clinicians should consider the possibilities of TLS especially in aggressive solid tumors.

[9th Decade Female with Dementia, Who Had Anemia Pointed Out on a Routine Laboratory Check].

In this report, we reviewed the results of RCPC held at the 63rd national congress of the Japanese Society of Laboratory Medicine. The case was a 9th decade female with dementia, who had anemia pointed out on a routine laboratory check. The type of anemia was macrocytic(MCV>130 fL). The serum Vit.B12 and folate levels were markedly decreased. However, her anemia was not improved despite supplementation with Vit.B12 and folate (data on MCV were improved). The WBC increased gradually, but she subsequently died. Laboratory data were assessed by three doctors (DN, NM, and TT: blood cell counts, smear morpholo- gy of peripheral blood cells, and clinical chemistry, respectively). They diagnosed the patient with a hema- tological disorder, probably neoplastic hematological diseases; however, it was very difficult to make a further clinical diagnosis because of the necessary data not presented at this meeting. The final diagnosis was acute myeloid leukemia (AML-M4). The direct cause of death was rupture of her spleen due to the massive infil- tration of neonlastic cells. rReviewl.

Ciliated muconodular papillary tumor of the lung: A report of five cases.

Ciliated muconodular papillary tumor (CMPT) of the lung is a newly defined and extremely rare tumor characterized by a papillary growth pattern, consisting of ciliated columnar cells, mucous cells, and basal cells with abundant mucin production. Tumor definitions and clinicopathological features continue to be debated. Herein, we report five surgical cases of CMPT to characterize its radiographic, gross, and microscopic features. The five cases involved three male patients aged 80, 67, and 66 years, and two female patients aged 73 and 70 years. Three cases were discovered during health care screenings, and two cases were found during follow-up for another synchronous cancer. Histopathological examination revealed that the tumor tissue was composed of ciliated columnar cells, mucous cells, and basal cells with abundant mucin production. Neither nuclear atypia nor mitotic figures were observed. All patients had good prognoses. The benign histological features and clinical courses in these five cases suggest that CMPT is an independent and benign tumor of the lung.

A case of a resectable single hepatic epithelioid hemangioendothelioma with characteristic imaging by ADC map.

A 47-year-old woman with a single-nodule hepatic tumor was referred to our hospital. She had no symptoms. The tumor was located at the surface of the right lobe of the liver; it showed peripheral low signal intensity on a magnetic resonance imaging apparent diffusion coefficient (ADC) map, and an influx of blood flow into the peripheral area of the tumor at the early vascular phase on perflubutane microbubble (Sonazoid(®)) contrast-enhanced (CE) ultrasonography. Since we suspected a malignant tumor, the patient underwent surgical resection. The hepatic tumor was resected curatively. Pathological examination revealed that the tumor was composed of epithelioid cells with an epithelioid structure and/or cord-like structure. Immunohistochemical staining was positive for cluster of differentiation 34 and factor VIII-related antigen. Based on the above, a final diagnosis of hepatic epithelioid hemangioendothelioma (EHE) was made. Hepatic EHE is a rare hepatic tumor: only a few cases of hepatic EHE with curative resection have been reported. We were unable to reach a diagnosis of hepatic EHE by imaging studies; however, an ADC map was useful in showing the malignant potential of the tumor, and CE ultrasonography was useful in revealing the peripheral blood flow of the tumor. When an unusual hepatic mass is encountered, hepatic EHE should be kept in mind, and the mass should be inspected with more than one imaging modality, including an ADC map, in the process of differential diagnosis.

A case of a stomach gastrointestinal stromal tumor with extremely predominant cystic formation.

A 79-year-old male was referred to the hospital with a history of abdominal discomfort. Abdominal computed tomography revealed a cystic tumor with irregular wall thickness, approximately 50 mm in diameter, along the lesser curvature of the gastric body. Magnetic resonance imaging visualized the mass as signal-hyperintense on T2-weighted imaging. Esophagogastroduodenoscopy showed a submucosal tumor with normal mucosa. Surgery was performed and the 60 × 50 × 50 mm mass was resected. The resected tumor comprised cystic and solid regions; the cystic region was filled by light bloody serous fluid. On histological examination, a solid region of the resected tumor showed a spindle-cell appearance. The diagnosis was gastric gastrointestinal stromal tumor (GIST) with predominant cystic formation. GISTs are usually solitary tumors, but in this case the tumor demonstrated extremely predominant cystic formation. Lesions with a hemorrhage or necrosis may form large cystic spaces. GISTs may show extensive cystic changes in response to tyrosine kinase inhibitor treatment; however, this patient had not undergone any such treatment before diagnosis. This represents an interesting case of a gastric GIST with predominant cystic formation occupying most of the tumor volume. Care should be taken to differentiate between GISTs and actual intra-abdominal cystic lesions.

Gastric intramucosal adenocarcinoma with an invasive micropapillary carcinoma component.

A 70-year-old woman was referred to our hospital because of early gastric cancer (lesser curvature of the antrum, 0-IIc, tub1, 15 mm) and underwent endoscopic submucosal dissection. Microscopically, the lesion was found to be confined to the mucosa, and predominantly composed of well-differentiated tubular adenocarcinoma with a micropapillary component. On immunohistochemical examination, the characteristic "inside-out pattern" of the micropapillary component was observed; thus, we diagnosed the lesion as gastric cancer with a micropapillary component. Invasive micropapillary carcinoma is a rare subtype of gastric carcinoma, and, to our knowledge, this is the first case of invasive micropapillary carcinoma of the stomach confined to the mucosa.

[A case report of undifferentiated carcinoma of the sigmoid colon with rhabdoid features].

A 45-year-old woman with persistent abdominal pain was admitted to our hospital. Detailed examination revealed a type 4 lesion with circumferential narrowing, which was diagnosed as a poorly differentiated carcinoma following forceps biopsy and ascitic fluid cytology. Although the lesion was surgically resected, the ascites increased rapidly, and her general condition deteriorated in the postoperative period. She died 6 weeks after the appearance of her symptoms. Autopsy and histological examination confirmed a very rare undifferentiated colon carcinoma with rhabdoid features, which is a high-grade malignant lesion associated with a poor prognosis.

[A case of advanced gastric cancer with an invasive micropapillary carcinoma component].

A 62-year-old man was admitted for the evaluation of epigastric pain. Upper gastrointestinal endoscopy revealed a type 3 circumferential carcinoma in the gastric antrum. Distal gastrectomy was performed, and the lesion was histopathologically diagnosed as gastric cancer with an invasive micropapillary carcinoma component. Chemotherapy was administered after surgery; however, he died with multiple liver metastases after 39 months. Micropapillary carcinoma is a rare, high-grade, malignant histological subtype of gastric cancer that has not been described in detail till date. Here we describe this rare lesion and present a review of the relevant literature.

[A case of calcifying fibrous tumor in the abdominal wall, morphologically resembling a gastric submucosal tumor].

We report an extremely rare case of a calcifying fibrous tumor (CFT) occurring in the abdominal wall. A 43-year-old woman was referred to our hospital because of a gastric submucosal tumor. Imaging findings revealed a gastric submucosal tumor with calcification. Endoscopic ultrasound-guided fine-needle aspiration was attempted to obtain a tissue specimen; however, the tumor was not adequately visualized because of calcification. Local excision was performed because of the tumor growth and the risk of progression to gastrointestinal stromal tumor. The tumor was histologically diagnosed as a CFT. We describe the imaging and pathological findings, and discuss the differential diagnosis and histogenesis of CFT.

Evaluation of endometrial cytology prepared with the Becton Dickinson SurePath™ method: a pilot study by the Osaki Study Group.

OBJECTIVE: To evaluate the sensitivity and specificity of the BD SurePath™ liquid-based Papanicolaou test for assessing the cytology of intrauterine endometrial samples according to newly devised cytological diagnostic criteria and a novel descriptive reporting format. MATERIALS AND METHODS: One hundred and twenty-two endometrial samples were analyzed. All samples were obtained directly from the intrauterine cavity using the Uterobrush or Honest Super Brush. The samples used for the histological examination and cytological tests were collected simultaneously. Our study group devised new cytological diagnostic criteria for examining endometrial samples: the Osaki Study Group method. In this study, histological diagnosis was considered to be the gold standard for cytological diagnosis. A novel descriptive reporting format was also used. RESULTS: Satisfactory cytological specimens were obtained in all cases. The sensitivity and specificity of the SurePath endometrial cytological examination method were 96.4 and 100%, respectively. CONCLUSION: These results indicate that the SurePath method is acceptable for clinical use. Since the SurePath method seems to be easier and allows greater preparation standardization than the conventional method, coupling it with our newly devised cytological diagnostic criteria and descriptive reporting format might represent a reliable diagnostic method for assessing endometrial specimens.

[A case of heterochrony and ectopic recurrence of a gastric signet ring cell carcinoma following partial gastrectomy].

A 53-year-old woman was referred to our hospital with a round, discolored lesion measuring 4mm in diameter that was identified as a minute gastric signet ring cell carcinoma. According to the Japanese classification of gastric carcinoma, it was graded as type 0-IIb. Seven years back, the woman had undergone pylorus-side gastrectomy for a small signet ring cell carcinoma, and the present lesion was assumed to result from heterochrony and ectopic recurrence. Endoscopic submucosal dissection was performed for the minute lesion. Clinicopathological findings revealed gastric mucosal cancer without invading lymph vessels or veins, similar to the previous lesion. We therefore report two very rare lesions in the same case. This case report demonstrates the importance of performing regular follow-up gastroduodenoscopy to detect recurrence in patients with these lesions.