Role of prolonged packing in postoperative anorectal abscess management: a systematic review and meta-analysis.

BACKGROUND: Prolonged packing of anorectal abscess cavities with internal dressings after incision and drainage is frequently used, but the efficacy of this practice remains controversial. Some studies highlight its use in hemostasis and preventing fistula and abscess recurrence, whereas others describe its economic burden and increase in pain. In this systematic review, we examine current evidence on the impact of packing after incision and drainage for anorectal abscesses. METHODS: The medical librarian conducted a comprehensive literature search on January 5, 2023. We conducted the meta-analysis using RevMan 5.4.1 software with a Mantel-Haenszel random-effects model. RESULTS: We identified 3 randomized controlled trials, comprising 490 patients. Of those, 241 patients (49%) received postoperative packing; most patients were male (n = 158, 65.6%), with a median age of 40.5 years and a follow-up of 6 months. Meta-analysis showed that prolonged wound packing was associated with delayed wound healing and increased pain, but no difference in abscess recurrence or fistula formation. CONCLUSION: In this systematic review of current evidence highlighting the impact of packing after incision and drainage for anorectal abscesses, we found that the practice is not associated with significant differences in abscess recurrence and fistula formation, but is associated with increased postoperative pain and delayed wound healing.

The analysis of different types of anorectal abscesses was conducted using the MRI 3D reconstruction technique.

It has not yet been proven whether sepsis affects the tissue around the anal canal. To address this issue, we established three-dimensional models for various types of anorectal abscesses and utilize 3D reconstruction of Magnetic Resonance Imaging scans to assess the extent of muscle damage caused by anorectal abscesses. Patients diagnosed with anorectal abscess, selected from January 2019 to January 2022 underwent pre- and post-operative scanning of pelvic floor and perianal tissues. The aforementioned structures were segmented for the reconstruction of a three-dimensional visual model and measurement of volumes for the abscess as well as the internal and external sphincters and levator ani muscle. The study included a total of 42 patients. Three-dimensional visualization models were created for different types of anorectal abscesses, including perianal, intersphincteric, ischiorectal, and supralevator abscesses. No statistically significant differences were observed in the volume of the internal sphincter, external sphincter, and levator ani muscle between pre- and post-operative patients. The 3D model of anorectal abscess, reconstructed from MRI data, offers a precise and direct visualization of the anatomical structures associated with various types of anorectal abscesses. The infection did not result in any damage to the internal and external anal sphincter and levator ani muscle.

Health economic evaluation of topical treatments for external anogenital warts.

INTRODUCTION: No treatment hierarchy for external anogenital warts (AGW) is currently recommended, despite wide variations in the costs of available treatments. The aim of this study was to propose a treatment hierarchy based on a health economic analysis of local treatments for AGW from the perspective of the French health insurance system. METHODS: Thirteen treatments and 73 treatment sequences were evaluated for AGW clearance and absence of AGW recurrence at 3 months of follow-up. The cost per treatment included the cost of consultations, drugs, medical procedures, and dressings. The time horizon was one year. The least expensive treatment was used as the reference treatment in the calculation of incremental cost-effectiveness ratios (ICERs). A two-line decision tree for treatment was constructed. RESULTS: Podophyllotoxin 0.5% solution was the least expensive treatment. Compared to podophyllotoxin 0.5% solution, the most cost-effective treatment was surgical excision (ICER: €456.82) and the most cost-effective treatment sequence was podophyllotoxin 0.5% solution followed by 5-fluorouracil (5-FU) 5% cream. CONCLUSION: Considering the high risk of bias in the randomized controlled trials considered, the most cost-effective treatment sequence was podophyllotoxin 0.5% solution followed by 5-FU 5% cream.

Characterization of Risk Factors Affecting the Recurrence of Perianal Abscesses and Complications.

BACKGROUND: Perianal abscess is a common condition among adults. The treatment of choice includes early and efficient drainage. The data regarding risk factors for abscess recurrence, fistula formation, and complications are limited as recent publications mainly focus on patients with inflammatory bowel disease. OBJECTIVES: To determine risk factors for abscess recurrence and fistula formation with regard to patient and surgical characteristics. METHODS: A retrospective analysis was performed on patients who presented to the emergency department and were diagnosed with perianal abscess between 2011-2020. RESULTS: We included 983 consecutive patients; 741 men, average age 43 years. Recurrence was documented in 434 cases. Crohn's disease was reported in 70, of which 50 had recurrent episodes (P < 0.0001); 121 of the 234 patients who smoked had recurrence (P = 0.0078); 8% had short symptomatic period (< 24 hours), which was a predisposing factor for recurrence, P < 0.0001. Patients in the non-recurrent group waited 2.53 hours less for surgical intervention (P < 0.0005(. The average time for recurrent episode was 18.95 ± 33.7 months. Fistula was diagnosed in 16.9% of all cases, while 11.6% were within the recurrent group. Surgical expertise of the physician did not significantly change the recurrence rate. CONCLUSIONS: Crohn's disease and smoking were the only significant risk factors for recurrence of perianal abscess. Timely intervention and drainage of sepsis should not be delayed. Involvement of more experienced surgeons did not seem to alter the natural history of the disease.

Auricular point acupressure for managing postoperative pain and reducing anxiety in patients with perianal abscesses.

OBJECTIVE: The objective of this study is to assess the efficacy of auricular point acupressure in relieving postoperative pain and reducing anxiety among patients with perianal abscesses. METHODS: We included 61 patients with perianal abscesses who were admitted to the Nantong First People's Hospital between July 2019 and June 2020 and were scheduled to undergo one-stage radical surgery. We divided them into the treatment group (n = 31), where patients were administered preoperative auricular acupressure targeting the bilateral Shenmen, subcortical, and other points. They were instructed to apply pressure five to six times per day, each time for about 3-5 min. Patients in the control group (n = 30) received routine preoperative preparation. The treatment duration for both groups was one week. We compared the two groups using the pain visual analog scale (VAS) scores, the use of additional postoperative analgesics, and scores on the Hamilton anxiety and depression scales pre- and post-surgery at 6 h, 24 h, 48 h, 72 h, and 1 week after surgery, as well as at the time of the first bowel movement. RESULTS: Patients in the treatment group reported lower VAS scores than those of the control group at 48 h, 72 h, 1 week, and at the first defecation post-surgery, and the differences were statistically significant (all P < 0.05). Additional postoperative analgesics were used in seven patients in the treatment group (22.58 %) and in 10 patients in the control group (33.33 %). The difference between the two groups was not statistically significant (χ2 = 0.88, P = 0.35). Postoperative scores for the Hamilton Anxiety Rating Scale (HAM-A) and the Hamilton Depression Rating Scale (HAM-D) in the treatment group were significantly lower than those in the control group (P < 0.05). CONCLUSION: The results of this study demonstrated that auricular point acupressure was effective in alleviating postoperative pain in patients with perianal abscesses and simultaneously reduced their postoperative psychological stress reactions. This dual effect provided both pain relief and a reduction of anxiety with fewer adverse reactions, making it a safe and effective treatment option.

A nomogram to predict anal condyloma acuminatum recurrence in HIV-negative patients following photodynamic therapy: A decade-long retrospective clinical study at a single tertiary hospital.

BACKGROUND: Anal condyloma acuminatum (CA) is marked by its thorny treatment and high recurrence rate. Although 5-aminolevulinic acid photodynamic therapy (ALA-PDT) demonstrates significant efficacy and safety in treating anal CA, it does not completely prevent recurrence. This study aimed to develop and validate a nomogram model in predicting the risk of relapse in HIV-negative patients with anal CA following treatment with ALA-PDT. METHODS: A retrospective analysis was conducted on patients diagnosed with anal CA who received combined CO2 laser vaporization and ALA-PDT between January 2013 and May 2023. Patients were divided into recurrence and non-recurrence groups. A nomogram was developed based on factors showing statistical significance in multivariable logistic regression analysis. The discriminative ability and clinical utility of the nomogram were assessed via ROC curves and decision curve analysis, with internal validation performed through bootstrap resampling. RESULTS: Among the 176 patients included, 33 (18.75 %) experienced recurrence, while 143 did not. Independent predictors for recurrence included HPV types, history of anal intercourse, and the number of CO2 laser treatments received. Incorporating these predictors, the nomogram demonstrated a superior diagnostic performance (area under the curve = 0.881, 95 % CI: 0.818-0.935) and a significant net benefit in decision curve analysis. CONCLUSIONS: The nomogram accurately predicts the risk of recurrence in HIV-negative patients with anal CA following ALA-PDT. It offers a valuable tool for guiding preoperative clinical decision-making and establishing personalized treatment strategies to minimize the risk of relapse.

Current Status and Role of Artificial Intelligence in Anorectal Diseases and Pelvic Floor Disorders.

Background: Anorectal diseases and pelvic floor disorders are prevalent among the general population. Patients may present with overlapping symptoms, delaying diagnosis, and lowering quality of life. Treating physicians encounter numerous challenges attributed to the complex nature of pelvic anatomy, limitations of diagnostic techniques, and lack of available resources. This article is an overview of the current state of artificial intelligence (AI) in tackling the difficulties of managing benign anorectal disorders and pelvic floor disorders. Methods: A systematic literature review was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. We searched the PubMed database to identify all potentially relevant studies published from January 2000 to August 2023. Search queries were built using the following terms: AI, machine learning, deep learning, benign anorectal disease, pelvic floor disorder, fecal incontinence, obstructive defecation, anal fistula, rectal prolapse, and anorectal manometry. Malignant anorectal articles and abstracts were excluded. Data from selected articles were analyzed. Results: 139 articles were found, 15 of which met our inclusion and exclusion criteria. The most common AI module was convolutional neural network. researchers were able to develop AI modules to optimize imaging studies for pelvis, fistula, and abscess anatomy, facilitated anorectal manometry interpretation, and improved high-definition anoscope use. None of the modules were validated in an external cohort. Conclusion: There is potential for AI to enhance the management of pelvic floor and benign anorectal diseases. Ongoing research necessitates the use of multidisciplinary approaches and collaboration between physicians and AI programmers to tackle pressing challenges.

Perianal Ulcers from Antihemorrhoidal Ointment: A Case Report and Literature Review.

ABSTRACT: Perianal ulcers (PAUs) related to antihemorrhoidal product use have been recently reported in the literature through a few case reports. However, other etiologies of PAU must be ruled out, including infectious disease, inflammatory disease, malignancy, pressure injuries, radiotherapy, and other topical drugs. In this report, the authors describe two cases of PAUs due to an antihemorrhoidal ointment. In case 1, a 68-year-old woman with a history of hemorrhoids presented with PAUs after using an antihemorrhoidal ointment for 2 months. The ulcers were assessed through a histopathologic study and treated with calcium alginate dressings, with complete re-epithelialization occurring after 2 months. In case 2, a 58-year-old woman with a history of hemorrhoids developed painful PAUs while using an antihemorrhoidal ointment for 2 months. No other probable cause was found, and the ulcers were treated by discontinuing the ointment. The ulcers showed marked improvement, and complete re-epithelialization occurred after 6 weeks without additional treatment.

[Management of acute and chronic anal pain]. / Prise en charge des douleurs anales aiguës et chroniques.

Anal pain can be acute (most commonly related to anal fissure, perianal abcess or fistula, perianal vein thrombosis) or chronic (functional or neuropathic) including levator ani syndrome, proctalgia fugax, pudendal nevralgia and coccygodynia. History and clinical examination are keys to diagnose acute causes. Diagnosis of chronic anal pain on the other hand is more challenging and based on thorough history and analysis of symptoms. The aim of this article is to discuss the main etiologies and treatments of acute and chronic anal pain, including an update on the management and treatment of hemorrhoidal disease and postoperative pain management.

La douleur anale peut être de survenue aiguë (le plus fréquemment en lien avec une fissure anale, un abcès ou fistule anale, ou une thrombose des veines périanales) ou chronique (fonctionnelle ou neuropathique), comportant le syndrome du releveur de l'anus, la proctalgia fugax, la névralgie du pudendal et les coccygodynies. Le diagnostic d'une douleur anale aiguë est rapidement posé grâce à l'anamnèse et surtout l'examen clinique. Les causes chroniques sont en revanche plus difficiles à diagnostiquer et nécessitent un interrogatoire détaillé avec une analyse approfondie des symptômes. Le but de cet article est d'explorer le traitement des étiologies de douleur anale aiguë, de pouvoir reconnaître une grande part des douleurs anales chroniques, sans oublier une mise à jour sur la maladie hémorroïdaire avec la prévention et gestion des douleurs postopératoires.

Does microbiology of perianal abscesses affect the length of hospital stay?

BACKGROUND: Perianal abscess is a common disease among adults, necessitating surgical drainage. We aimed to assess the role of microbiology and other factors in prolonged hospitalization of patients with perianal abscesses. METHODS: This retrospective study included all patients aged 18 or older who underwent surgical incision and drainage for perianal abscess in a single medical center between 2016 and 2020. Data regarding demographics, bacteriological cultures, and length of hospital stay were collected via electronic patient charts. A prolonged hospital stay was defined as a LOS longer than 3 days. RESULTS: A total of 791 patients were included, of which 77.5% were male, with a mean age of 43.2. Overall, 46.1% of patients had positive cultures, of which 69.9% were polymicrobial. The most common pathogen found in obtained cultures was Escherichia coli (69.9%), followed by streptococcus species (36.7%) and Bacteroides (26.0%). Females had a significantly longer hospital stay (p = 0.03). Prolonged hospital stay was associated with older age (p < 0.0001), female gender (p = 0.04), and positive cultures for Enterococcus (p = 0.02). CONCLUSIONS: This study identified clinical and microbiological risk factors for prolonged hospitalization in patients with perianal abscesses. Further studies are needed to evaluate the association between specific pathogens and rates of complications.

Efficacy of surgical treatment of perianal infection in patients with hematological malignancy.

The efficacy of surgical intervention for perianal infection in patients with hematologic malignancies is not well established. Therefore, our study aimed to investigate the clinical efficacy and complications of surgical treatment of perianal infection in patients with hematologic malignancies. This retrospective study included patients with hematological malignancies who were diagnosed with perianal infections and treated at the China Aerospace Science & Industry Corporation 731 Hospital between 2018 and 2022. Patient characteristics, hematological data, surgical intervention, and complications, including recurrence and mortality, were analyzed. This study included 156 patients with leukemia aged 2 months to 71 years who were treated surgically for perianal infection, comprising 94 males and 62 females. Perianal infection included 36 cases of abscesses, 91 anal fistulas, and 29 anal fissures accompanied by infection. A total of 36 patients developed severe complications postoperatively, including 4 patients who died, 6 patients with severe incision bleeding, 18 patients with severe pain, 6 patients with sepsis, 12 patients who needed reoperation, 15 patients with hospitalization for more than 2 weeks, and 3 patients with anal stenosis; none of the patients developed anal incontinence. Additionally, risk factors for postoperative complications of perianal infection in patients with hematologic malignancies include leukopenia, agranulocytosis, thrombocytopenia, depth of abscess and not undergone an MRI. Surgical intervention may improve the prognosis of patients with perianal abscess formation, particularly in patients who show no improvement with medical therapy and those who develop perianal sepsis. Granulocytopenia and thrombocytopenia should be improved before surgery, which can significantly reduce postoperative complications. Although these findings are from a case series without a comparator, they may be of value to physicians because to the best of our knowledge, no randomized or prospective studies have been conducted on the management of perianal infections in patients with hematological malignancies.

Sexual Function After Surgical Treatment for Benign Anorectal Disorders.

Benign anorectal diseases such as hemorrhoidal disease, anal fissure, anal pruritus, perianal abscess, and fistula are the most common ones. The aim of this study was to assess sexual function in patients after surgery for benign anorectal diseases. Sixty-one male patients with perianal fistulas, operated on at Department of General Surgery, Faculty of Medicine, completed a self-administered questionnaire including the International Index of Erectile Function (IIEF) score. The median IIEF score of the postoperative patients was significantly higher (24, range [10-25]) than that of preoperative patients (22, range [5-25]), p < .0001. Sexual function is significantly influenced by surgery for benign anorectal diseases.

Pleasurable and problematic receptive anal intercourse and diseases of the colon, rectum and anus.

The ability to experience pleasurable sexual activity is important for human health. Receptive anal intercourse (RAI) is a common, though frequently stigmatized, pleasurable sexual activity. Little is known about how diseases of the colon, rectum, and anus and their treatments affect RAI. Engaging in RAI with gastrointestinal disease can be difficult due to the unpredictability of symptoms and treatment-related toxic effects. Patients might experience sphincter hypertonicity, gastrointestinal symptom-specific anxiety, altered pelvic blood flow from structural disorders, decreased sensation from cancer-directed therapies or body image issues from stoma creation. These can result in problematic RAI - encompassing anodyspareunia (painful RAI), arousal dysfunction, orgasm dysfunction and decreased sexual desire. Therapeutic strategies for problematic RAI in patients living with gastrointestinal diseases and/or treatment-related dysfunction include pelvic floor muscle strengthening and stretching, psychological interventions, and restorative devices. Providing health-care professionals with a framework to discuss pleasurable RAI and diagnose problematic RAI can help improve patient outcomes. Normalizing RAI, affirming pleasure from RAI and acknowledging that the gastrointestinal system is involved in sexual pleasure, sexual function and sexual health will help transform the scientific paradigm of sexual health to one that is more just and equitable.

[Prevalence and genotypic characteristics of anal papillomavirus infection in a cohort of HIV-positive men who have sex with men]. / Prevalencia y características genotípicas de la infección anal por papilomavirus en una cohorte de hombres que tienen sexo con hombres VIH-positivos.

OBJECTIVE: To determine the prevalence and genotypic characteristics of anal papillomaviruses in HIV-positive men who have sex with men (MSM). MATERIALS AND METHODS: This is a prospective cross-sectional observational study of HIV-positive MSM at Almenara General Hospital between September 2017 and December 2018. HPV detection and typing was performed using a polymerase chain reaction technique that evaluated 21 genotypes stratified according to oncogenic risk into six low-risk and fifteen high-risk. RESULTS: we evaluated 214 HIV-positive MSM. The overall prevalence of anal infection by papillomavirus infection was 70% (150/214). 86% (129/150) were caused by high-risk genotypes, 79% (102/129) of them were affected by a two or more-papillomavirus genotype. The most frequent high-risk genotypes were HPV-16, 31% (46/150); HPV-52, 22% (33/150); HPV-33, 21% (31/150); HPV-58, 21% (31/150) and HPV-31, 20% (30/150). In addition, HPV-18 reached 7% (10/150). The most frequent low-risk genotypes were HPV-6, 30% (45/150) and HPV-11, 29% (44/150). CONCLUSIONS: Prevalence of anal papillomavirus infection in HIV-positive MSM is very high in the hospital investigated. Most of these infections occurs with high-risk oncogenic genotypes. Papillomavirus 16 was the most frequent high-risk genotype.

Antibiotic Treatment Has No Influence on Anal Fistula Formation and Recurrent Perianal Abscess After Incision and Drainage of Cryptogenic Perianal Abscess: A Randomized Single-Blinded Prospective Study.

BACKGROUND: Anal fistula commonly appears after incision and drainage of a perianal abscess. Theoretically, a fistula develops as a consequence of the infection process. Antibiotic treatment was suggested to decrease the possibility of fistula development. OBJECTIVE: We hypothesized that antibiotic treatment has no influence on the development of anal fistula after surgical treatment of perianal abscess. DESIGN: A single-blinded randomized prospective study. SETTINGS: Patients with primary cryptogenic abscesses were eligible to participate. PATIENTS: Patients were divided into 2 groups. Patients in group I received amoxicillin 875 mg/clavulanic acid 125 mg during 7 days after surgery, and patients in group II received no antibiotics. The study database included demographics and clinical and laboratory data. MAIN OUTCOME MEASURES: Patients were examined in our outpatient clinic 2 weeks, 4 months, and 1 year after surgery, and a telephone questionnaire was performed 6 months after surgery. The primary outcome was the formation of anal fistula. The secondary outcome was recurrent perianal abscess. RESULTS: Overall, 98 patients completed the study. Groups were not different in inclusion. Anal fistula was diagnosed in 16 patients (16.3%) in group I (treatment group) and 10 patients (10.2%) in group II (control group; p = 0.67). Nine patients (9.2%) developed recurrent perianal abscess, 4 in the treatment group and 5 in the control group ( p = 0.73). LIMITATIONS: A relatively small number of patients were treated in a single medical center. CONCLUSION: Antibiotic therapy has no influence on anal fistula or recurrent perianal abscess formation after incision and drainage of perianal abscess. See Video Abstract . EL TRATAMIENTO CON ANTIBITICOS NO TIENE INFLUENCIA EN LA FORMACIN DE FSTULA ANAL Y EN EL ABSCESO PERIANAL RECURRENTE DESPUS DE LA INCISIN Y DRENAJE DE UN ABSCESO PERIANAL CRIPTOGNICO UN ESTUDIO PROSPECTIVO ALEATORIZADO, SIMPLE CIEGO: ANTECEDENTES:La fístula anal comúnmente aparece después de la incisión y drenaje de un absceso perianal. Teóricamente, la fístula se desarrolla como consecuencia del proceso infeccioso. Se sugirió tratamiento antibiótico para disminuir la posibilidad de desarrollo de fístula.OBJETIVO:Hipotetizamos que el tratamiento con antibióticos no tiene influencia en el desarrollo de fístula anal después del tratamiento quirúrgico del absceso perianal.DISEÑO:Estudio prospectivo, aleatorio, simple ciego.AJUSTE Y PACIENTES:Los pacientes con absceso criptogénico primario fueron elegibles para participar. Los pacientes se dividieron en dos grupos. Los pacientes del Grupo I recibieron amoxicilina 875 mg/ácido clavulánico 125 mg durante los 7 días posteriores a la cirugía y los pacientes del Grupo II no recibieron antibióticos. La base de datos del estudio incluyó datos demográficos, clínicos y de laboratorio.PRINCIPALES MEDIDAS DE RESULTADO:Los pacientes fueron examinados en nuestra clínica ambulatoria 2 semanas, cuatro meses y 1 año después de la cirugía y se realizó un cuestionario telefónico 6 meses después de la cirugía. El resultado primario fue la formación de una fístula anal. El resultado secundario fue el absceso perianal recurrente.RESULTADOS:En total, 98 pacientes completaron el estudio. Los grupos no fueron diferentes en cuanto a la inclusión. Se diagnosticó fístula anal en 16 (16,3%) pacientes del Grupo I (grupo de tratamiento) y 10 (10,2%) pacientes del Grupo II (grupo control) (p = 0,67). Nueve pacientes (9,2%) desarrollaron absceso perianal recurrente, 4 en el grupo de tratamiento y 5 en el grupo control (p = 0,73).LIMITACIONES:Número relativamente pequeño de pacientes tratados en un solo centro médico.CONCLUSIÓN:La terapia con antibióticos no tuvo influencia sobre la fístula anal o la formación de absceso perianal recurrente después de la incisión y drenaje del absceso perianal. (Traducción - Dr. Fidel Ruiz Healy ).

Pyoderma Gangrenosum of the Genitalia, Anus, and Perineum: Two Case Reports and a Review of Published Cases.

ABSTRACT: Pyoderma gangrenosum is an inflammatory skin disease that presents with rapidly progressive ulcers with violaceous, undermined borders. Despite most commonly affecting the lower extremities, pyoderma gangrenosum can rarely present in the genital, anal, and perineal regions. We describe 2 cases and report a review of published cases.

"Emergency Room Incision and Drainage of Perirectal Abscess is Equivalent to Incision and Drainage in the Operating Room".

BACKGROUND: Current guidelines for management of anorectal abscesses make no recommendations for operative vs bedside incision and drainage (I&D). The purpose of this study was to determine if management in the operating room is necessary to adequately drain anorectal abscesses and prevent short-term complications for patients presenting to the emergency department (ED). METHODS: Patients with perirectal abscesses were identified and divided into two groups based on intervention type: "bedside" or "operative." Demographic, laboratory, and encounter data were obtained from the medical record. Study outcomes included 30-day complications (return to the ED, reintervention, and readmission). Data were analyzed with univariate and multivariate analyses using SPSS (version 28). RESULTS: A total of 113 patients with anorectal abscesses were identified. Sixty-six (58%) underwent bedside I&D and 47 (42%) operative I&D. The overall complication rate was 10%. A total of 9 patients (6 bedside and 3 operative) returned to the ED. Six of these patients required reintervention (5 bedside and 1 operative), and 1 was readmitted. Two patients from the bedside group required a second I&D during their index admission. Pre-procedure SIRS (P = .02) was found to be associated with 30-day complications. Provider specialty and training level were not associated with 30-day complications. DISCUSSION: In this study, for patients presenting to the ED, bedside drainage was found to be an adequate management strategy to achieve complete drainage without a significant increase in the rate of complications when compared to operative drainage.