Percutaneous treatment of liver hydatid cysts

Migrating and herniating hydatid cysts

OBJECTIVE

To present the prevalence and imaging findings of patients with hydatid disease (HD) showing features of migration or herniation of the hydatid cysts (HCs) and underline the clinical significance of this condition.

MATERIALS AND METHODS

Between May 2003 and June 2006, 212 patients with HD were diagnosed by abdomen and/or thorax CT, searched for migrating or herniating HC. Imaging findings of 7 patients (5 women, 2 men with an age range of 19-63 years; mean+/-S.D., 44+/-19 years) with HD showing transdiaphragmatic migration (6 subjects) or femoral herniation (1 subject) were evaluated. Diagnosis of all the patients were established by pathologic examination and migration or herniation was confirmed by surgery in all patients.

RESULTS

Liver HD were identified in 169 (79.7%) of 212 patients with HD. Transdiaphragmatic migration of HCs were identified in 6 (3.5%) of the 169 patients with liver HD. In one patient, femoral herniation of the retroperitoneal HC into the proximal anterior thigh was identified. All of these seven patients exhibiting migration or herniation of HCs had active HCs including 'daughter cysts'. Two patients had previous surgery because of liver HD and any supradiaphragmatic lesion was not noted before operation. Findings of migration or herniation were confirmed by surgery.

CONCLUSION

Active HCs may show migration or herniation due to pressure difference between the anatomic cavities, and in some of the patients, by contribution of gravity. Previous surgery may be a complementary factor for migration as seen in two of our patients. The possibility of migration or herniation in patients with HD should be considered before surgery.

Diagnosis and percutaneous treatment of soft-tissue hydatid cysts

The purpose of this study is to demonstrate and discuss the radiological features of four patients with muscular hydatid disease and to evaluate the results of percutaneous treatment in these patients. Four patients (three female and one male) with six muscular hydatid cysts underwent percutaneous treatment and were followed up. The mean age of patients was 35 years (range: 12-60 years). Type I (n = 2), type II (n = 1), and type III (n = 3) hydatid cysts were observed in the thigh (n = 3) and gluteal (n = 1) region on radiologic examination. All interventions were performed under sonographic and fluoroscopic guidance. According to the type of the cyst, the procedure was carried out by either a "catheterization technique with hypertonic saline and alcohol" or a "modified catheterization technique." The mean cathaterization time was 13.7 days, ranging from 1 to 54 days. The dimensions of the residual cavity were noted at every sonographic control, and an average of 96.1% volume reduction was obtained in six cysts of four patients. No sign of viability was observed during the follow-up period. Cavity infection and cellulitis were observed as complications, which resolved after medical therapy. Percutaneous treatment is a safe and effective procedure in patients with soft-tissue hydatid cysts and should be considered as a serious alternative to surgery.

Surgical techniques and treatment for hepatic hydatid cysts

PURPOSE

Hepatic hydatid cysts (HHCs) are a parasitic infestation caused by several species of Echinococcus. We examined the clinical features of HHCs and evaluated the results of various surgical procedures.

METHODS

One hundred and sixty-nine patients aged between 17 and 84 years underwent surgery for HHCs within a 12-year period. We recorded the demographic data, location of the cysts, surgical procedures used, morbidity, recurrences, and hospital stay.

RESULTS

Most (90.5%) of the patients presented with symptoms, but 16 (9.5%) patients reported no symptoms. The most common symptom was abdominal pain. The overall number of cysts was 216 HHCs and 9 concomitant hydatid cysts in other abdominal organs. The surgical treatments consisted of hepatic resection in 8 (4.7%) patients, cystostomy with drainage in 43 (25.5%), cystostomy with capitonnage in 22 (13%), cystostomy with omentoplasty in 72 (42.6%), and cystectomy in 24 (14.2%). Splenectomy or nephrectomy was also performed in nine patients. Postoperative complications developed in 36 (21.3%) patients, and three suffered recurrences. The postoperative mortality rate was 1.2%. Postoperative complications were more frequent after cystostomy with capitonnage than after cystostomy with omentoplasty (P < 0.001) or cystectomy (P = 0.0037). The additional procedures prolonged the hospital stay.

CONCLUSIONS

Current surgical techniques combined with antiscolicidal therapy using albendazole are effective and safe treatments for HHCs, associated with low morbidity, mortality, and recurrence rates.

Unusual imaging characteristics of complicated hydatid disease

Hydatid disease, a worldwide zoonosis, is caused by the larval stage of the Echinococcus tapeworm. Although the liver and the lungs are the most frequently involved organs in the body, hydatid cysts of other organs are unusual. Radiologically, they usually demonstrate typical imaging findings, but unusual imaging characteristics of complicated cyst of hydatid disease, associated with high morbidity and mortality, are rarely described in the literature. The purpose of this study is to review the general features of hydatidosis and to discuss atypical imaging characteristics of the complicated hydatid disease in the human, with an emphasis on structure and rupture of the cystic lesion as well as ultrasonography (USG), computed tomography (CT), and magnetic resonance imaging (MRI) features of the disease. In our study, the available literature and images of the cases with complicated hydatidosis involving liver, lung, brain, spine and orbit were reviewed retrospectively. In hydatid disease, there are many potential local and systemic complications due to secondary involvement in almost any anatomic location in humans. Radiologically, in addition to the presence of atypical findings such as perifocal edema, non-homogenous contrast enhancement, multiplicity or septations and calcification, various unusual manifestations due to rupture or infection of the cyst have been observed in our cases with complicated hydatid disease. To prevent subsequent acute catastrophic results and the development of recurrences in various organs, it should be kept in mind that complicated hydatid cysts can cause unusual USG, CT, and MRI findings, in addition to typical ones, in endemic areas. Therefore, familiarity with atypical radiological appearances of complicated hydatid disease may be valuable in making a correct diagnosis and treatment.

Advances in liver echinococcosis: diagnosis and treatment

Echinococcosis or hydatid cyst disease is a zoonosis caused by the larval cestode Echinococcus granulosus. It consists of a parasitic tapeworm disease affecting mainly liver. Nevertheless, the disease might well spread to more unusual sites such as lungs and brain. The definitive diagnosis of liver echinococcosis requires a combination of imaging, serologic, and immunologic studies. Despite the fact that a number of scolecoidal agents have been developed against liver hydatid disease, the cornerstone of the definitive treatment remains surgery. Both the classic surgical techniques and the recently developed minimally invasive and laparoscopic methods target the eradication of the disease by simultaneously avoiding perioperative spillage and dissemination or recurrence of echinococcosis. The present article constitutes a review of the biology of the parasite as well as the epidemiology, diagnosis, and therapeutic options of the liver hydatid disease.

Hydatid Disease of the Spleen

Splenic echinococcosis is a rare disease even in endemic regions. The most commonly affected organ is the liver, followed by the lung and the spleen. In this article we discuss epidemiology, clinical presentation, diagnosis, pathophysiology, pathologic features, imaging findings, complications, differential diagnosis, and treatment of hydatid disease of the spleen.

The scolicidal effects of honey

Echinococcosis is a zoonosis that is caused by adult or larval tapeworms belonging to the genus Echinococcus. Until now, no studies have sought to determine the scolicidal effects of honey. Therefore, the present study was undertaken to explore the scolicidal effects of honey in different concentrations for various exposure times. Tubes that contained at least 500 protoscolices were supplemented with 1%, 5%, 10%, 25%, and 50% concentrations of honey. Tubes were maintained at room temperature for 0.5, 1, 2, 3, 4, 5, and 10 min. At the end of the incubation times, the viability of protoscolices was assessed through a trypan blue exclusion test. The effective dose of honey was applied intraperitoneally to determine whether it caused an anaphylactic reaction or hyperglycemia. Honey concentrations of 10% or greater killed all protoscolices. The scolicidal effects of honey began at the end of the third minute. Honey did not cause adverse effects when applied intraperitoneally. In this study, an investigation of the scolicidal effects of honey showed that it is highly effective at a 10% concentration. On the basis of in vivo study results, the investigators concluded that honey is a potent scolicidal agent.

Evaluation on scolicidal efficacy of propolis

BACKGROUND

Propolis is a resinous material collected by bees from various plants. It has antimicrobial, antioxidative, immunostimulative, and regenerative properties. We determined the scolicidal effect of propolis in different concentrations and various exposure times.

MATERIALS AND METHODS

Tubes containing Echinococcus granulosus protoscoleces were supplemented with different concentrations of ethyl alcohol extract of propolis. At the end of the incubation times, viability of protoscoleces was assessed by trypan blue exclusion test. We also applied 5 ml of 1 microg/ml propolis intraperitoneally for determination of side effects and mortality rates.

RESULTS

We determined that 1 microg/ml concentration of propolis killed all of the protoscoleces at the end of the 3rd minute. In the in vivo part of the study, intraperitoneal application of propolis did not cause any side effects or mortality.

CONCLUSION

We concluded that this natural agent can be used as a potent scolicidal agent after studies which will determine in vivo efficacy and the effects on liver and biliary tree when injected directly into the common bile duct.

Complete resolution of an alveolar echinococcosis liver lesion following percutaneous treatment

Herein we present a 63-year-old male patient with a solid hepatic alveolar echinococcosis diagnosed by surgical biopsy. His liver lesion, which was infected, was drained by percutaneous catheterization. The lesion surprisingly disappeared completely after the treatment. The patient was followed-up without any symptoms for 20 months after the drainage. As alveolar echinococcosis of the liver behaves like a slow-growing liver cancer, the disappearance of our patient's lesion was a very unusual and rare outcome, which, to the best of our knowledge, has never been published in the literature.

Percutaneous treatment of univesicular versus multivesicular hepatic hydatid cysts

BACKGROUND

Percutaneous drainage has been used successfully to treat hepatic hydatid cysts. This study aimed to analyze the results of this method in the treatment of univesicular and multivesicular hepatic hydatid cysts.

METHODS

Ultrasound-guided percutaneous drainage was used to treat 72 patients (44 women and 28 men; average age, 46.8 +/- 17.7 years) with hepatic hydatidosis. Of these 72 patients, 57 had one cyst, 7 had two cysts, and 8 had three cysts. Albendazole (10 mg per kg of body weight daily for 8 weeks) was administered to all the patients. Serial assessments included clinical and biochemical examinations, ultrasonography, and serologic tests for echinococcal antibody titers.

RESULTS

During the follow-up period, the mean cyst diameter decreased from 83.3 +/- 38.6 mm to 11.1 +/- 16.0 mm (p < 0.001) in the multivesicular group (27 cysts) and from 65.5 +/- 27.5 to 5.9 +/- 13.0 mm (p < 0.001) in the univesicular group (68 cysts). The final cyst diameter did not differ significantly between the two groups (p = 0.1). The findings showed that 81% of the cysts in the univesicular group and 63% in the multivesicular group disappeared (p = 0.12). The mean hospital stay was 4.8 +/- 2.9 days in the univesicular group and 6.1 +/- 4.7 days in the multivesicular group (p < 0.001). After an initial rise, the echinococcal-antibody titers fell progressively, and at the last follow-up evaluation were negative (<1:160) for 43 patients (94%) in the univesicular group and 19 patients (73%) in the multivesicular group (p = 0.03). Mild nonfatal complications were experienced by 24 patients (33%).

CONCLUSIONS

Percutaneous drainage combined with albendazole therapy is an effective and safe method for managing hydatid cysts of the liver that requires a short hospital stay. Disappearance of the cysts depends on cyst size. Multivesicular cysts have a more complicated course, a slower disappearance, and a higher incidence of positive echinococcal-antibody titers. Abscess formed after the procedure can be treated successfully by percutaneous drainage.

Percutaneous treatment of giant abdominal hydatid cysts: long-term results

BACKGROUND

This study aimed to evaluate the efficacy of percutaneous treatment of giant abdominal hydatid cysts.

METHODS

In this study, 15 abdominal giant hydatid cysts were treated with the catheterization technique, which included puncture of the cyst, aspiration of fluid, instillation and respiration of hypertonic saline solution, and catheterization and sclerosant therapy with absolute ethanol followed by free drainage of the cavity. The catheter was removed when the daily drainage was less than 10 ml.

RESULTS

The goals, including inactivation of the parasite and elimination of the mass effect, were achieved in all patients. Catheterization required a mean of 32 days (range, 14-52 days) and hospitalization a mean of 8.73 days (range, 2-30 days). No evidence for recurrence was observed in any patient during a mean follow-up period of 52.8 months (range, 36-72 months).

CONCLUSION

Percutaneous treatment of giant hydatid cysts is effective because it eliminates both the mass effect and the parasite and alleviates the symptoms. Although the long catheterization time associated with the procedure is unfavorable, it is tolerated by the patients.

Percutaneous imaging-guided treatment of hydatid liver cysts: Do long-term results make it a first choice?

AIM

To evaluate the long-term results of percutaneous imaging-guided treatment of hydatid liver cysts.

MATERIALS AND METHODS

Sixty patients with 77 hydatid liver cysts underwent percutaneous treatment with ultrasonography (US) or computed tomography (CT) guidance. Absolute alcohol and hypertonic saline were used for sclerosing the cysts after aspiration. Prophylactic albendazole treatment was given before and after the procedures. Follow-up US and CT were obtained periodically, and changes in cyst morphology were recorded. Minimum follow-up period for the patients included in this study was 12 months. Serological correlation was also available for a group of patients. The outcome of the procedures were categorized into five groups based on morphological changes observed by imaging.

RESULTS

Procedures were regarded as successful in 80% and unsuccessful in 20% of patients. Failures most often occurred with type III cysts; less than half (39%) of the total type III cysts had a successful outcome. On the other hand, all type I cysts ended up with cure. Anaphylaxis, pneumotorax and severe pain interrupting the procedures were also among the reasons of failure.

CONCLUSION

Percutaneous aspiration, injection and reaspiration (PAIR) of types I and II hydatid liver cysts is effective and safe in the long-term. Surgery should no longer be regarded as the first choice treatment in all hydatid liver cysts but should be reserved for type III and certain active type IV cysts.

Giant Hepatic Hydatid Cyst as a Cause of Small Bowel Obstruction

Today, giant hydatid cysts are fairly rare even in endemic areas. We describe a case of an extremely large hydatid cyst of the liver that was causing massive compression of the neighboring organs, giving rise to a subocclusive syndrome of the intestine. After considering the various approaches available for the treatment of this disease, it was decided that radical surgery was still the best therapeutic choice, especially when extremely large cysts are involved. In particular, in clinical situations where it is difficult to perform radical surgical procedures, less aggressive surgery followed by drug treatment should be the treatment of choice.

Percutaneous needle aspiration, injection, and reaspiration with or without benzimidazole coverage for uncomplicated hepatic hydatid cysts

BACKGROUND

Hepatic hydatid cyst is an important public health problem in parts of the world where dogs are used for cattle breeding. Management of uncomplicated hepatic hydatid cysts is currently surgical. However, the puncture, aspiration, injection, and re-aspiration (PAIR) method with or without benzimidazole coverage has appeared as an alternative to surgery over the past decade.

OBJECTIVES

To assess the benefits and harms of PAIR with or without benzimidazole coverage for patients with uncomplicated hepatic hydatid cyst in comparison with sham/no intervention, surgery, or medical treatment.

SEARCH STRATEGY

The Cochrane Hepato-Biliary Group Controlled Trials Register, The Cochrane Controlled Trials Register in The Cochrane Library, MEDLINE, EMBASE, DARE, and ACP Journal Club and full text searches were combined (all searched October 2004). Reference lists of pertinent studies and other identified literature were scanned. Researchers in the field were contacted.

SELECTION CRITERIA

Only randomised clinical trials using the PAIR method with or without benzimidazole coverage as the experimental treatment of uncomplicated hepatic hydatid cyst (ie, hepatic hydatid cysts which are not infected and do not have any communication with the biliary tree or other viscera) versus no intervention, sham puncture (ie, performing all steps for puncture, pretending that PAIR is being performed, but actually not performing the procedure proper), surgery, or chemotherapy were included.

DATA COLLECTION AND ANALYSIS

Data were independently extracted and methodological quality of each trial was assessed by the authors. Principal authors of the trials were contacted to retrieve missing data.

MAIN RESULTS

We found no randomised clinical trials comparing PAIR versus no or sham intervention. We identified only two randomised clinical trials, one comparing PAIR versus surgical treatment (n = 50) and the other comparing PAIR (with or without albendazole) versus albendazole alone (n = 30). Both trials were graded as 'adequate' for allocation concealment; however, generation of allocation sequence and blinding methods were 'unclear' in both of them. Compared to surgery, PAIR plus albendazole obtain similar cyst disappearance and mean cyst diameter with fewer adverse events (32% versus 84%, P < 0.001) and fewer days in hospital (mean + SD) ( 4.2 + 1.5 versus 12.7 + 6.5 days, P < 0.001). Compared to albendazole, PAIR with or without albendazole obtain significantly more often (P < 0.01) cyst reduction and symptomatic relief.

AUTHORS' CONCLUSIONS

PAIR seems promising, but there is insufficient evidence to support or refute PAIR with or without benzimidazole coverage for treating patients with uncomplicated hepatic hydatid cyst. Further well-designed randomised clinical trials are necessary to address the topic.

Results of surgical, laparoscopic, and percutaneous treatment for hydatid disease of the liver: 10 years experience with 355 patients

Selection of the most appropriate treatment to obtain the best results with the lowest rate of recurrence and minimal morbidity and mortality is mandatory for the management of hepatic hydatid disease. The surgical approach is the mainstay of treatment, and there has been a tendency toward laparoscopic surgery and, more recently, percutaneous treatment (PT), which has become increasingly popular with revolutions in techniques. We aimed to evaluate the results of current therapeutic methods in the context of a 10-year single-institution experience. Between 1992 and 2003, 355 patients with 510 hydatid cysts of the liver were treated by open operation, laparoscopic surgery, or PT. The series included 128 females and 227 males ranging in age from 10 years to 73 years. Preferred treatment modalities, perioperative complications, interventions, recurrences, and length of hospital stay were retrospectively analyzed. There were two postoperative deaths (1.08%) in the open surgery group. Biliary leakage was observed in 28 patients treated with open surgery, in 10 patients after PT, and in 2 after laparoscopic treatment. Recurrence rates were 16.2%, 3.3%, and 3.5% after open surgery, laparoscopic surgery, and percutaneous treatment, respectively. Characteristics of the cyst, presence of cystobiliary communications, and the availability of a multidisciplinary team are the factors that we believe directly affect the results. Radical surgery can be done safely for suitable cases; conventional procedures are associated with greater morbidity. Laparoscopic surgery seems effective and safe, with low morbidity and recurrence rates for type I-III cysts in accessible localizations. Our experience with PAIR (puncture, aspiration, injection, and reaspiration) and catheterization provides evidence that the procedure is an effective and safe option.

Hydatid cyst of the liver: a case report and literature review

Taiwan is nearly free from hydatid disease. We report a case of hydatid cyst of the liver in a 37-year-old man who originally lived in India and had migrated to Taiwan 2 years earlier. He presented with right upper quadrant pain and intermittent low-grade fever. Both sonography and computed tomography (CT) demonstrated a cystic lesion with vesicles at its periphery in segments 6 and 7 of the liver. A hydatid cyst was diagnosed. The patient underwent radical excision of the cyst with total removal without opening the wall. He also received pre- and postoperative oral mebendazole. Pathology showed a hydatid cyst consisting of three layers: the inner single nucleated geminal layer, the middle acellular laminated layer, and the outer pericyst originating from inflammatory and hepatic cells. This case highlights that accurate preoperative diagnosis of hydatid disease can be made from personal history, typical sonography and CT study in non-endemic areas.

Percutaneous Treatment of Hydatid Liver Cysts in Children as a Primary Treatment: Long-term Results

PURPOSE

To evaluate the effectiveness and long-term results of percutaneous treatment for hydatid liver cysts in pediatric patients.

MATERIALS AND METHODS

Thirty-four pediatric patients (15 male, 19 female; ages 4-17 years; mean age, 9.4 years) with 51 hydatid liver cysts underwent ultrasound (US)-guided percutaneous treatment with albendazole prophylaxis. There were 15 type II lesions with membrane detachment and 36 type I lesions resembling simple hepatic cysts with pure anechogenic content or small echogenic reflections and a regular well-delineated wall. The method of US-guided puncture, aspiration, injection of hypertonic saline solution, and reaspiration was preferred for 21 lesions. For the remaining 30 larger cysts, the intervention was performed with the same percutaneous technique but followed by catheterization, drainage, control cystography, and sclerotherapy with ethanol. During follow-up, US examinations were performed at 1, 3, 6, and 12 months for the first year and yearly thereafter.

RESULTS

Percutaneous treatment of hepatic hydatid disease was successful in 33 patients (97.1%). During follow-up, US findings in the lesions changed significantly; at year 1, the inner content of the lesions became heterogeneous with a semisolid appearance, and the mean reduction in volume was 81.4%. At 2-year follow-up, most hydatid cysts had become solid in nature and the reduction in volume reached 65%-99% (mean, 85.1%). There were no recurrences or additional lesions after the follow-up of 1-6 years (mean, 3.1 years). Average hospital stay for the whole group in this study was 3.5 days.

CONCLUSIONS

The long-term results of percutaneous liver hydatid cyst treatment in children are in accordance with the results in adults. Percutaneous treatment of uncomplicated type I and type II liver hydatid cysts in pediatric patients is an efficient and safe treatment with short hospitalization.

Diagnosis and treatment of hepatic echinococcosis: an overview

BACKGROUND

Surgery has long been considered the first-choice treatment in patients with echinococcosis of the liver. The poorly predictable outcome of older studies using mebendazole or albendazole confirmed this belief. Since the introduction of a percutaneous technique (PAIR; puncture, aspiration, injection, reaspiration) treatment policy is changing. The actual question is which treatment is preferred in which patients.

METHODS

Review of recent literature.

RESULTS

Laparoscopic treatment of anteriorly located hepatic cysts is a new surgical technique with high success rates (77%-100%) and low complication (0%-17%) and recurrence rates (0%-9%). Albendazole is superior to mebendazole treatment. Degenerative changes were found in 82% of patients treated with albendazole and in 56% of those treated with mebendazole. The main problem is the high relapse rate: 25% mostly within 2 years. PAIR proved to be superior to albendazole treatment (88% versus 18%) and equally effective as surgery (86% versus 76%). A combined injection of alcohol with polidocanol is a simple alternative to PAIR. Percutaneous evacuation of cyst content (PEVAC) made percutaneous treatment accessible to patients with complicated cysts.

CONCLUSIONS

Albendazole is the first-choice treatment in patients with univesicular cysts. PAIR or combined injection of alcohol with polidocanol is indicated when pain is intractable or albendazole fails. In patients with multivesicular cysts, PEVAC is a better choice. Surgery is the first-choice treatment only when the expertise of percutaneous treatment is not available or when percutaneous treatment fails.

Effect of Different Pharmacologic and Chemical Agents on the Integrity of Hydatid Cyst Membranes

OBJECTIVE

We performed an in vitro investigation of the effects of widely used scolicidal and sclerosing agents, as well as some pharmacologic products, on the integrity of the membrane of hydatid cysts.

MATERIALS AND METHODS

Two milliliters each of 22 agents, 2 mL of clear fluid, and one piece of hydatid cyst membrane were put into bottles. The hydatid cyst membranes were evaluated by visual observation and manual palpation. Visual examination of the bottles was performed daily for 7 days, and observations of membrane changes, including translucency, destruction, swelling, and melting, were recorded. Manual evaluation was done on the seventh day by finger examination, and membrane fragility was scored.

RESULTS

The hydatid cyst membrane was completely melted in a few minutes in a 2.5% solution of sodium hypochlorite and in 1 hr by a 0.1% sodium hypochlorite solution. The integrity of the hydatid cyst membrane was preserved in alcohol, acetone, glutaraldehyde, albendazole, acetylsalicylic acid, formaldehyde, lidocaine, hydrochloric acid, ammonia, pancreatin, Betadine, methylene blue, and isotonic saline samples. The membranes in the metronidazole and hypertonic saline solutions were not damaged but showed significantly increased fragility. The membranes in levamisole and piperazine hexahydrate became translucent and showed moderate fragility.

CONCLUSION

None of the agents that are used in clinical practice had important effects on the dissolution of hydatid cyst membranes. However, sodium hypochlorite solutions completely melted the hydatid cyst membranes. Because the use of this agent on living tissue is limited, further study is needed to investigate its clinical use.

Is fear of anaphylactic shock discouraging surgeons from more widely adopting percutaneous and laparoscopic techniques in the treatment of liver hydatid cyst?

BACKGROUND

Sources of reports about laparoscopic and percutaneous treatment of liver hydatid cysts are limited to just a few countries. To address the reason behind this, we carried out a survey of 30 surgeons in northern Jordan.

METHODS

A questionnaire was distributed to collect data regarding the surgical technique preferred by each surgeon. Further information was collected from those not adopting minimal-access techniques to determine their reasons for not doing so.

RESULTS

Only 3 surgeons (10%) considered laparoscopy as the first line of treatment. Of the 27 surgeons who did not consider percutaneous or laparoscopic treatment, fear of anaphylaxis and/or dissemination was the main reason given by 21 surgeons (78%) for not using minimal access techniques.

CONCLUSIONS

The seemingly exaggerated traditional fear of anaphylaxis seems to discourage surgeons from more widely adopting minimal access techniques for the treatment of hydatid cyst.

[Antiparasite therapy]

The lack of any parasite vaccine makes prevention against parasitic diseases to be based, as in the past, in ecological measures such as the environmental health and vector control to interrupt the biological cycle; on the other hand, it is also based in anti-parasite drugs. Once the disease has been acquired it is just possible to take medication. Studies on the way of action allow to understand more about the physiology of the parasite and, on the other hand, to understand better the physiology of the parasite allows to design new more effective drugs. However, the vast majority of these new drugs have been obtained thanks to intelligent and selective screening of generic molecules more than from the result of the knowledge of the biochemistry of the parasite. Despite all this, it is well known the mechanisms of action of many antiparasite drugs which have led us, when possible, to the discussion about possible targets to give an idea of how the rational approximation to design new medicaments is done.

Surgical treatment of hydatid cysts of the liver

BACKGROUND

Echinococcosis is a zoonotic disease that occurs throughout the world. The purpose of this study was to assess the clinical features and results of surgical treatment of hepatic hydatid cysts.

METHODS

One hundred and two patients operated on between 1991 and 2002 were reviewed retrospectively. The patients' demographic data, location, number and size of cysts, type of surgical procedure performed, morbidity, recurrences and duration of hospital stay were recorded.

RESULTS

There were 74 male and 28 female patients with ages ranging from 15 to over 60 years. The most frequent symptom was abdominal pain. From the total of 136 hepatic cysts, 54 (39.7 per cent) were managed by cystostomy and drainage, 40 (29.4 per cent) by cystostomy and capitonnage, 16 (11.8 per cent) by cystostomy and omentoplasty, 24 (17.6 per cent) by cystectomy and two (1.5 per cent) by left lateral hepatic resection. Postoperative complications were more frequent following cystostomy with omentoplasty (six of 16 patients) compared with cystectomy (none of 18) (P = 0.005). Choledochotomy increased the length of hospital stay in patients having cystostomy and drainage (P = 0.021) and in those having cystostomy with omentoplasty (P = 0.028). Two recurrences were observed.

CONCLUSION

Surgery combined with medical treatment by albendazole is effective in the eradication of hepatic hydatid disease and in the prevention of local recurrence.

Anaphylaxis due to a rupture of hydatid cyst: imaging findings of a 10-year-old boy

Anaphylactic shock as a result of trauma is very rare. We report the clinical and radiologic findings of a 10-year-old boy who developed systemic anaphylaxis due to traumatic rupture of hepatic hydatid cyst into a pericystic blood vessel. In regions where hydatid disease is endemic, rupture of a hydatid cyst might be taken into consideration in patients who have post-traumatic anaphylactic shock. Likewise, this pathology should be kept in mind when evaluating an immigrant from an endemic area in nonendemic regions.

Surgical treatment of hydatid cysts of the liver in the era of percutaneous treatment

BACKGROUND

Although surgery is the recommended treatment for liver hydatid disease, percutaneous treatment has been introduced as an alternative to surgery. No previous studies have been reported for patients who have not been suitable for percutaneous treatment and undergone surgery. The aim if this study was therefore to evaluate the patients who have liver hydatid disease and not suitable for percutaneous treatment and to determine the effectiveness of different types of surgical interventions in these patients.

PATIENTS AND METHODS

Ninety-five patients who underwent operations for liver hydatid disease were retrospectively reviewed. All patients were radiologically evaluated before surgery for possible percutaneous treatment. Besides other related factors, conventional and radical surgical approaches were compared in terms of complication and recurrence rate.

RESULTS

Overall complication and recurrence rates were 40% and 25%, respectively. Conventional surgical approaches and common bile duct exploration were significantly associated with an increased complication and recurrence rate.

CONCLUSIONS

Selection of simple liver hydatid cysts for percutaneous treatment had led us to operate more difficult and complicated cases. It seems that routine use of endoscopic retrograde cholangiography in the preoperative period and more efforts to perform radical procedures are two major determinants in the successful treatment of theses complicated cases.

Ivermectin used in percutaneous drug injection method for the treatment of liver hydatid disease in sheep

BACKGROUND & AIMS

Ivermectin is a macrocyclic lactone (avermectins) produced by the actinomycete Streptomyces avermitilis. In this experimental study, the effectiveness of intracystic injection of ivermectin was studied as a new approach of percutaneous treatment of cystic echinococcosis.

METHODS

Twelve naturally infected sheep were selected and divided into 2 subgroups: treatment group (n = 9) and control group (n = 3). In the treatment group, approximate volume of ivermectin solution needed to achieve an intracystic concentration of 10 microg/mL was injected into cysts, but in the control group, sterile distillated water was applied. No reaspiration was performed at all.

RESULTS

In the following period of 6 months, repeated sonography revealed a significant decrease in cyst sizes and progressive solidification of the cysts in the treatment group. In the control group, volumes of the cysts were increased. No major complications occurred during or after the procedure. After 6 months, all sheep were killed and examined for macroscopic and microscopic changes. Pathologic examination in the treatment group showed pericyst hyalinization, inflammatory cells in the cyst wall, degeneration of laminated and germinal membrane, and necrotic material in the cyst cavity. No viable protoscolices or daughter cysts were observed.

CONCLUSIONS

Percutaneous treatment of cystic echinococcosis with ivermectin as a scolicidal agent seems to be effective in this animal model.

Interventional radiology procedures in the liver. Biopsy, drainage, and ablation

Radiologically guided interventional procedures in the liver have continually increased, in number and variety, over the years. Factors promoting these advances include new technology, innovative ideas, and growing acceptance by clinicians and patients. Percutaneous biopsy and drainage procedures are firmly established techniques with low complication rates. Ablation by injected substances is useful for treating certain tumor types. The most exciting development is the introduction of percutaneous thermal techniques for tumor ablation. Although more experience is needed to optimize the use of focal thermal ablation, early results seem promising.

MR imaging of infective liver lesions

This article discusses MR imaging of infective liver lesions including pyogenic liver abscesses, amebic liver abscesses, echinococcal disease, hepatic fungal abscesses, granulomatous hepatic infections, schistosomiasis, and fascioliasis.

Hydatid disease of the liver in children: evaluation of surgical treatment

The medical records of 55 paediatric patients with hepatic hydatidosis, who were treated between 1990 and 2001 at Atatürk University, Turkey, were reviewed retrospectively. The most common symptoms at presentation were abdominal mass (32.7% of cases) and pain (81.8% of cases) in the right upper quadrant of the abdomen. Cysts were found in the right lobe in 41 patients, in the left lobe in four patients and in both lobes in 10 patients. Multiple hepatic cysts were present in 12 cases and eight patients also had cysts in other organs. Surgical procedures were evacuation of the cyst and management of the cavity with tube drainage, capitonnage, omentoplasty, cystectomy or segmentectomy. Long-lasting biliary fistula (two patients) and cholangitis (two patients) developed following evacuation and tube drainage, and one patient developed cholangitis after capitonnage. This review suggests that omentoplasty and capitonnage are more effective than tube drainage in the management of the cyst cavity.

Echinococcal cysts of the liver: a retrospective analysis of clinico-radiological findings and different therapeutic modalities

The clinico-radiological findings and management of 61 patients with proven hepatic echinococcal cysts (HEC) examined over the past 5 years were retrospectively analyzed. The sonography and computed tomography (CT) scan findings were studied before and after therapy. The indications, healing, and complications rates for each therapeutic modality were recorded. There is a predominance of HEC in adult females (female to male ratio, 1.77:1). The majority of patients complained of abdominal pain (39/61; 64.4%), and the majority of cysts were solitary (43/61; 70.5%), localized in the right lobe (47/61; 77.0%), and superficial (57/61; 93.4%). Few cysts were complicated by rupture, intraperitoneal (2/61; 3.2%), or intrabiliary (5/61; 8.2%). Medical treatment consisted of antihelmintic chemotherapy alone in eight patients with an adequate response in seven patients (7/8; 87.5%). Thirty-two patients had open or laparoscopic surgery with a cure rate of 50%. The other 50% had major complications requiring a further adjuvant therapy for a complete cure. Nine patients underwent percutaneous catheter ablation combined with adjuvant chemotherapy; healing was observed in eight patients (8/9; 88.8%). HEC are best treated by nonsurgical minimally invasive techniques combined with adjuvant antihelmintic chemotherapy, while surgery should be reserved for complicated HEC by intraperitoneal rupture.

Treatment of hydatid disease

Hydatid disease caused by Echinococcus granulosus presents medical, veterinary and economic problems worldwide. Hydatidosis can be treated by medical, surgical and percutaneous modalities. Benzoimidazole carbamates are effective against E. granulosus. Although mebendazole, the first benzoimidazole used, has some beneficial effects on the disease in selected patients, it has also been associated with treatment failure in some cases, perhaps because of its poor absorption. Albendazole, a more recently developed benzoimidazole, is more effective than mebendazole. Praziquantel, an isoquinoline derivative, has recently shown value in the treatment of human echinococcal disease and its use in combination with albendazole is recommended in some patients. Ultrasound guided cyst puncture is another choice of treatment which has been used successfully in selected patients, although anaphylactic and allergic reactions due to spillage of the cyst contents have occurred. Surgical therapy in echinococcal hydatid disease is indicated for large cysts with multiple daughter cysts, superficially located single liver cysts which have a risk of rupture, complicated cysts such as those accompanied by infection, compression or obstruction, and cysts located in vital organs or which are exerting pressure on adjacent vital organs. However, surgical therapy carries high risk of mortality, morbidity or recurrence. Therefore, medical therapy may be an alternative option in uncomplicated cysts and in patients at high risk from surgery. The adjuvant use of drugs with surgery and percutaneous treatment can also be recommended for some patients.