Giuseppe Zocco

Anorectal reconstruction after abdominoperineal resection

PURPOSE: The aims of the study contained herein were to analyze the efficacy and safety of a chronically electrostimulated double-wrap graciloplasty for restoration of continence after a curative abdominoperineal resection for rectal carcinoma and to evaluate late results of a stimulation protocol that was begun early. METHODS: During the last six years, 31 consecutive patients underwent this procedure: in 24 patients, electrostimulated double-wrap graciloplasty was performed simultaneously with abdominoperineal resection for lower rectal cancer; 7 strictly selected patients underwent conversion to an abdominal stoma following previous abdominoperineal resection (mean length of time from stoma creation, 71.4 months). Anorectal reconstruction was performed following a surgical scheme already standardized since 1985 in 102 patients: after abdominoperineal resection, the distal colon was pulled through to the perineum and surrounded by both gracilis muscles following an “alfa and new-sling” configuration; using platinumiridium electrodes, both muscles were then connected to a pulse generator, which was implanted subcutaneously in the abdomen. All surgical steps were performed during the same surgical session to allow early postoperative stimulation of the transposed muscles. A contemporary covering stoma was abandoned as a standard procedure; the distal colon was left closed for a few postoperative days, then it was resected and sutured to the perineum under local anesthesia. Eighteen patients underwent preoperative or postoperative radiotherapy or both, without any significant adverse outcome. To increase gracilis resistance to prolonged “tonic” contraction, patients underwent a chronic, low-frequency stimulation protocol. In the last 11 patients, a new “over-the-nerveand intramuscular” implant was adopted to optimize fiber recruitment and to reduce electrostimulation thresholds. At regular intervals, all patients were evaluated using continence scores and questionnaires, electromanometry, endoluminal ultrasound study, and defecography. RESULTS: Twenty-six of 31 patients were evaluable for continence, with a mean length of follow-up of 37.8 (range, 4–68) months; 3 patients died because of cancer recurrence, 1 underwent conversion to an abdominal stoma, and 1 is waiting for stoma closure. Continence to liquid and solid stools was achieved in 22 patients (85 percent), and electromanometry findings confirmed a good muscular contraction postoperatively and during follow-up intervals. No postoperative mortality (40 days) was observed; the postoperative complication rate was high (22 percent), but early treatment (drainage and temporary diversion in 7 patients) led to favorable outcomes (4 resolutions, 3 partial muscular impairments). Four stimulators had to be temporarily explanted because of late complications, and two stimulators had to be replaced because of battery exhaustion after three years of use with high stimulation parameters. A significant difference was observed comparing full-contracting threshold after intramuscular (14 patients) and the new over-the-nerve and intramuscular implant technique. CONCLUSIONS: The study contained herein confirms the efficacy of the surgical scheme we have adopted since 1985 to reconstruct sphincteric apparatus after abdominoperineal resection of the rectum. The “one-step” timing of surgical and electrostimulation-related procedures and the early start of stimulation did not show a significant increase in the complication rate and did not produce noticeable muscular or nerve damage. Adoption of chronic electrostimulation protocols using implantable devices increased the rate of fully continent patients; nevertheless, the overall cost for devices and medical staff duties was high, and a small increase of late morbidity was observed. Finally, the preliminary experience with our new technique of electrode implants encourages further application.

Gene promoter methylation in colorectal cancer and healthy adjacent mucosa specimens: Correlation with physiological and pathological characteristics, and with biomarkers of one-carbon metabolism

We evaluated the promoter methylation levels of the APC, MGMT, hMLH1, RASSF1A and CDKN2A genes in 107 colorectal cancer (CRC) samples and 80 healthy adjacent tissues. We searched for correlation with both physical and pathological features, polymorphisms of folate metabolism pathway genes (MTHFR, MTRR, MTR, RFC1, TYMS, and DNMT3B), and data on circulating folate, vitamin B12 and homocysteine, which were available in a subgroup of the CRC patients. An increased number of methylated samples were found in CRC respect to adjacent healthy tissues, with the exception of APC, which was also frequently methylated in healthy colonic mucosa. Statistically significant associations were found between RASSF1A promoter methylation and tumor stage, and between hMLH1 promoter methylation and tumor location. Increasing age positively correlated with both hMLH1 and MGMT methylation levels in CRC tissues, and with APC methylation levels in the adjacent healthy mucosa. Concerning gender, females showed higher hMLH1 promoter methylation levels with respect to males. In CRC samples, the MTR 2756AG genotype correlated with higher methylation levels of RASSF1A, and the TYMS 1494 6bp ins/del polymorphism correlated with the methylation levels of both APC and hMLH1. In adjacent healthy tissues, MTR 2756AG and TYMS 1494 6bp del/del genotypes correlated with APC and MGMT promoter methylation, respectively. Low folate levels were associated with hMLH1 hypermethylation. Present results support the hypothesis that DNA methylation in CRC depends from both physiological and environmental factors, with one-carbon metabolism largely involved in this process.

Gastrointestinal stromal tumour of the duodenum in childhood: a rare case report

BackgroundGastrointestinal stromal tumours (GISTs) are uncommon primary mesenchymal tumours of the gastrointestinal tract mostly observed in the adults. Duodenal GISTs are relatively rare in adults and it should be regarded as exceptional in childhood. In young patients duodenal GISTs may be a source of potentially lethal haemorrhage and this adds diagnostic and therapeutic dilemmas to the concern about the long-term outcome.Case presentationA 14-year-old boy was referred to our hospital with severe anaemia due to recurrent episodes of upper gastrointestinal haemorrhage. Endoscopy, small bowel series, scintigraphy and video capsule endoscopy previously done elsewhere were negative. Shortly after the admission, the patient underwent emergency surgery for severe recurrence of the bleeding. At surgery, a 4 cm solid mass arising from the wall of the fourth portion of the duodenum was identified. The invasion and the erosion of the duodenal mucosa was confirmed by intra-operative pushed duodenoscopy. The mass was resected by a full-thickness duodenal wall excision with adequate grossly free margins. Immunohistochemical analysis of the specimen revealed to be positive for CD117 (c-KIT protein) consistent with a diagnosis of GIST. The number of mitoses was < 5/50 HPF. Mutational analysis for c-KIT/PDGFRA tyrosine kinase receptor genes resulted in a wildtype pattern. The patient had an uneventful course and he has remained disease-free during two years of follow-up.ConclusionDuodenal GISTs in children are very rare and may present with massive bleeding. Cure can be achieved by complete surgical resection, but even in the low-aggressive tumours the long-term outcome may be unpredictable.

Laparoscopic treatment of pancreatic insulinoma

Laparoscopy and laparoscopic ultrasonography (LUS) have been proposed for the diagnosis and treatment of pancreatic insulinoma. We present for cases of pancreatic insulinoma approached by laparoscopy guided by LUS. In three cases, insulinomas were in the pancreatic body and in one case in the pancreatic head. All lesions were detected preoperatively by abdominal US and confirmed by computed tomography. Laparoscopy was performed under general anesthesia. LUS was performed using a 10-mm flexible probe. In two cases the adenoma was enucleated using scissors and electrocoagulation, major vessels were controlled using clips, and enucleation was completed using a 30-mm endo-GIA. In one case a laparoscopic distal pancreatectomy with spleen preservation was performed. In one case the adenoma was deep in the pancreatic head; minilaparotomy was performed and the adenoma enucleated. Patients were discharged in good health 5–7 days after surgery. The postoperative course was complicated in one case of enucleation by peripancreatic fluid collection that was treated percutaneously. Our experience confirms that accurate localization followed by excision of tumors via the laparoscopic approach constitute a significant advance in the management of insulinoma.

Percutaneous management of multiple bilateral liver abscesses complicating Crohn disease.

Liver abscess is a rare complication of Crohn disease. A case of multiple, bilateral, pyogenic liver abscesses appearing as a recurrent manifestation of Crohn disease in a 34-year-old man is reported. Conservative management with antibiotics, double-catheter drainage, and multiple aspirations was successful. The liver abscesses disappeared with no recurrence during a 5-year follow-up period.

Laparoscopic left hemicolectomy in a patient with cirrhosis scheduled for liver transplantation

Hepatic cirrhosis is a negative prognostic factor for major abdominal surgery, with a greater risk of bleeding, infection, and ascites. The case of a 54-year-man with adenocarcinoma of the sigma affected by hepatitis B virus and hepatitis C virus hepatopathy as well as micro- and macrconodular cirrhosis (Child’s B7 stage) waiting for liver transplantation is reported. After a consultation with the liver transplantation our hospital, and considering the the patient’s age laparoscopy was determined to be the procedure of choice because it would give him the possibility of a transplantation in the future. A typical left hemicolectomy with left flexure mobilization and mechanic colorectal T-T-anastomosis was therefore performed. All surgical maneuvers in the right hypochondrium were avoided. Mobilization was performed using an ultrasonic scalpel to reduce the risk of bleeding, and the anatomic stump was pulled out by means of a midline minilaparotomy, sparing the anastomotic circles of the abdominal wall. Follow-up evaluation was uneventful. At an 8-month follow-up visit, the patient was in good general condition. In this case, laparoscopic surgery allowed an oncologically suitable colonic resection without complication and poor surgical stress. Moreover, open surgery would have reduced the possibility of a transplantation in the future.

Is development of bronchial metastasis following laparoscopic right hemicolectomy for colon cancer related to pneumoperitoneum

Endobronchial metastases secondary to colon–rectum neoplasm are rare in the natural history of the disease; metastases spread and growth pattern are not known [1]. There are no reports in the literature of endobronchial metastasis following laparoscopic resection of colon cancer. We report the case of a 70-year-old man with bronchial metastasis following laparoscopic resection of a right colon carcinoma. The patient, who was affected by a carcinoma of the posterior wall of the ascending colon located just below right flexure, underwent a standard laparoscopic right colectomy in November 1997. Histology revealed an adenocarcinoma staged T2N1, with only a metastatic node confirmed (Duke’s C1). During follow-up, a progressive increase of CEA levels was detected, but abdominal sonography, total body computed tomography (CT), and colonoscopy were negative. A scintigraphy performed with ab-anti-CEA was positive for a suspected metastasis in the right hypocondrium at the site of the operated tumor. Despite negative CT, a local neoplastic recurrence was suspected, and in July 2000 the patient underwent diagnostic laparoscopy with laparoscopic sonography that was negative. At the same time, a minilaparotomy was performed, and no evidence of abdominal tumor was found. In October 2000, after an episode of hemophthisis a tumor of the right superior lobar bronchus was diagnosed: The patient underwent surgery (right superior lobectomy). Histology confirmed the primitive intestinal nature of the lesion. Postoperative chemotherapy was performed. At 15-month followup, the patient was disease free. Metastases development is a natural part of a tumor’s history. Data reported in the literature suggest the feasibility of a laparoscopic approach to colon neoplasms. Although a theoretical increase in the metastatic risk in port sites has been confirmed in many studies, pneumoperitoneum’s effects on metastases spread at distance are not clear yet [2]. The typical features of this clinical case suggest that a possible role of pneumoperitoneum on bronchial metastases development should be considered. The hemodynamical effects of pneumoperitoneum on splancnic flow are well-known [3]. Can pneumoperitoneum enhance the risk of metastases spread via the Retzius’ system?