Not just a GIST: an unclassifiable neoplasm in the genomics era.

Unclassifiable primary tumors despite adequate tissue for pathologic examination are quite rare. We present a case of a 72-year-old female who was found to have an abdominal mass after she reported to the emergency department with complaints of abdominal pain with spasms, bloating and nausea. Computed tomography scan demonstrated a 12.3 × 15.7 × 15.9 large multilobulated mass, abutting and compressing the stomach, compatible with neoplasm. She underwent esophagogastroduodenoscopy with findings concerning for gastrointestinal stromal tumor. The patient underwent en bloc resection of the mass. The neoplasm was unable to be classified on pathologic examination despite a comprehensive workup and multiple consultations with specialized pathologists from local institutions, as well as national specialists. Final pathology was unclassified malignant neoplasm displaying calretinin expression only. This presents a difficult clinical entity to treat. Even in the genomics era, there are tumors that cannot be even broadly classified on pathologic examination.

Analysis of 10 years of open, laparoscopic, and robotic rectal surgeries in the community setting.

Background: Colorectal cancer is the fourth most common cancer in the US. Many of these patients will require operations. Although there is significant data in the literature that supports minimally invasive colorectal operations in the academic setting, few studies have examined their performance in community hospitals. Methods: Data was collected from a high-volume, university-affiliated, community center. Our Cancer Registry Database was queried to include any patients that had rectal surgery at our institution from 2010 to 2020. One hundred-twenty-two patients were identified and reviewed retrospectively. Main outcome measures include estimated blood loss (EBL), blood transfusion, time to first bowel movement, oncologic resection, length of stay (LOS), survival, and cost analysis. Results: Both robotic and laparoscopic operations resulted in lower average EBL, less blood transfusions, and less time to first bowel movement (p = 0.003, 0.006, 0.003, respectively). There was no significant difference in ability to achieve R0 resection, adequate lymph node retrieval, and adequate total mesorectal excision (TME, p = 0.856, 0.489, 0.500, respectively). LOS was significantly shorter for minimally invasive operations, 4.35 vs 8.48 days, and average survival was longest for laparoscopic operations at 7.19 years as compared to 5.55 years for open operations (p < 0.001, 0.026, respectively). Cost was lowest for robotic operations (0.003). Conclusions: Minimally invasive rectal operations, especially robotic, lead to better short- and long-term outcomes, equivalent oncologic resection, and are more cost-effective as compared to open operations even in the community setting, supporting continued performance and growth of robotic colorectal operations in the community setting. Key message: Although there is significant data in the literature that supports minimally invasive colorectal operations in the academic setting, few studies have examined their performance in community hospitals as this study does. This study found that minimally invasive rectal operations, especially robotic, lead to better short- and long-term outcomes, equivalent oncologic resection, and are more cost-effective as compared to open operations even in the community setting, supporting continued performance and growth of robotic colorectal operations in the community setting.

Sarcina, a new threat in the bariatric era.

First identified in humans by Goodsir in 1842, Sarcina were already known to cause fatal abomasal bloat in animals. Their pathogenicity in humans has only recently been characterized. Sarcina is not inherently pathogenic but, with a gastric ulcer and delayed gastric emptying, can result in perforation. We present a case report of a 32-year-old woman status post-gastric banding presenting with epigastric pain. Upper endoscopy revealed a gastric ulcer near the band. After deflation, upper gastrointestinal series showed passage of contrast and no perforation. Ulcer biopsy showed gastric contents composed of Sarcina. Proton pump inhibitors and antibiotics were administered. Follow-up endoscopy at an outside institution resulted in perforation. This case report supports a growing body of literature that Sarcina organisms contribute to ulcers and perforation. This is the first report of Sarcina in elective bariatric surgery patients, highlighting the high suspicion needed among pathologists evaluating ulcers in this unique surgical population.

Biliary and gastric drainage in advanced pancreatic serous cystadenoma and portal hypertension in Von Hippel-Lindau syndrome.

Von Hippel-Lindau is a genetic syndrome, comprising several variant mutations on chromosome 3, that predisposes patients to the development of benign and malignant tumors. Tough relatively common, Von Hippel-Lindau syndrome (VHL) with associated hepato-biliary and gastric outlet obstruction, and portal hypertension consequent to the mass effect of a pancreatic serous cystadenoma is a rare scenario. This manuscript reports a 41-year-old female with the aforementioned presentation who successfully underwent a palliative cholecysto- and a gastro-jejunostomy. To the knowledge of the authors, this is the only report, describing a palliative biliary decompression for VHL-related pancreatic serous cystadenoma and portal hypertension.

Pulmonary expression of inducible heme-oxygenase after ischemia/reperfusion of the lower extremities in rats.

BACKGROUND: Expression of inducible heme-oxygenase (HO-1) has been shown to be increased in various inflammatory disorders, which may confer a protective role. The aim of our study was to assess pulmonary expression of HO-1 after ischemia/reperfusion (I/R) of the lower limbs in rats. MATERIALS AND METHODS: We compared three groups of rats (n = 5/group): one Sham group, and two I/R groups (aorta cross-clamped for 2 h followed by 2 h of reperfusion), one of which pre-treated with Zn-protoporphyrin (Zn-PP), a competitive inhibitor of HO (50 micromol/kg, i.p.). At the end of experiment, lungs were harvested for determination of HO activity and HO-1 expression by Western blot and immunohistochemistry. Lung injury was assessed by bronchoalveolar lavage, histological study, and determination of the lung Evans Blue dye content, an index of microvascular permeability. RESULTS: I/R of the lower limbs was responsible for acute lung injury (ALI), characterized by neutrophilic infiltration (87 +/- 20 x 10(3) neutrophils/mm(3), Sham group versus 191 +/- 38 x 10(3) neutrophils/mm(3), I/R group; P < 0.002) and an increase in lung Evans blue dye content: (74 +/- 6 microg/g, Sham group versus 122 +/- 48 microg/g, I/R group; P < 0.05). Pre-treatment with Zn-PP further increases the Evans Blue content (122 +/- 48 microg/g, I/R group versus 179 +/- 23 microg/g Zn-PP group P < 0.05) and the neutrophilic infiltration. Pulmonary heme-oxygenase activity, and HO-1 content were increased after I/R. (10.5 +/- 12 pmol bilirubin/mg protein/h, Sham group versus 101.2 +/- 66 pmol bilirubin/mg protein/h, I/R group; P < 0.02). Immunohistochemistry revealed that the expression of HO-1 was mainly localized to inflammatory cells. CONCLUSIONS: ALI following I/R of the lower limbs in rats is associated with an increase of pulmonary expression of HO-1, inhibition of this expression increase the severity of ALI.