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Amyand's Hernia with Appendicitis Masquerading As Fournier's

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Amyand's Hernia with Appendicitis Masquerading As Fournier's Rajaguru and Tan Ee Lee Journal of Medical Case Reports (2016) 10:263 DOI 10.1186/s13256-016-1046-9 CASE REPORT Open Access Amyand’s hernia with appendicitis masquerading as Fournier’s gangrene: a case report and review of the literature Kishore Rajaguru* and Daniel Tan Ee Lee Abstract Background: The incarceration of an appendix within an inguinal hernia sac is known as Amyand’s hernia. Appendicitis in Amyand’s hernia accounts for 0.1 % of the cases. An aggressive necrotizing infection of the genitalia and perineum, called Fournier’s gangrene, can rapidly progress to sepsis and death. We describe a rare case of Fournier’s gangrene complicating Amyand’s inguinal hernia which has rarely been reported in the literature. Case presentation: This case report describes the presentation and management of a 47-year-old Chinese man who presented with pus discharge from his right inguinoscrotal region and lower abdominal pain with clinical signs of Fournier’s gangrene. On surgical exploration, a complicated Amyand’s hernia (Losanoff and Basson classification type 4) was found to be the cause of his Fournier’s gangrene. Conclusions: A perforated appendix within an inguinal hernia causing Fournier’s gangrene is rarely seen in clinical practice. The diagnosis of this condition is almost always made intraoperatively. Early recognition and awareness of perforated appendicitis within an inguinal hernia sac as one of the causes of Fournier’s gangrene and good surgical technique in such cases are the keys to success when dealing with this surgical issue. In complicated presentations of Amyand’s hernia, an appendicectomy with anatomical repair is the best treatment. It is better to avoid meshplasty. Keywords: Amyand’s hernia, Fournier’s gangrene, Necrotizing fasciitis, Perforated appendicitis Background gangrene is rarely seen in clinical practice; we encoun- The incarceration of a non-inflamed appendix, inflamed tered such a case in our practice and it demands appendix, or perforated appendix within an inguinal her- reporting. nia is termed Amyand’s hernia [1]. The incidence of ap- pendicitis within an inguinal hernia is estimated at 0.07 Case presentation to 0.13 %. Preoperative diagnosis of appendicitis in A 47-year-old mentally impaired Chinese man presented obstructed hernia is difficult and almost always the diag- with 4 days’ history of lower abdominal pain and pus nosis is made intraoperatively. Fournier’s gangrene is a discharge from his right inguinoscrotal area. He had had rapidly progressive necrotizing infection of the perineum continuous fever with chills and rigors for the past 2 and the genitalia with occasional extension to the anter- days. He denied any history of diarrhea, vomiting, or ab- ior abdominal wall. It is a surgical emergency character- domen distension. His past medical history included ized by a synergistic necrotizing fasciitis and the hyperthyroidism and hypertension and he has been on infection usually spreads along the subcutaneous and antithyroid medications and beta blockers for more than fascial planes, although myonecrosis is rare. A perforated 20 years. appendix in an inguinal hernia presenting as Fournier’s On examination he was lethargic, toxic, and clinically dehydrated. Initial vital signs showed that he was hypothermic (30.4 °C), hypotensive (74/50 mmHg), with * Correspondence: [email protected] Department of General Surgery, Ng Teng Fong General Hospital, 1 Jurong bradycardia (48/minute) and tachypnea (30/minute). East Street 21, Singapore 609606, Singapore Cardiovascular and respiratory examinations were © 2016 The Author(s). Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. Rajaguru and Tan Ee Lee Journal of Medical Case Reports (2016) 10:263 Page 2 of 5 insignificant. His abdomen was soft with tenderness over In view of suspected thyroid crisis (Burch and War- his lower abdomen; however, his bowel sounds were ac- tofsky score of 50) we started him on propylthiouracil tive. An examination of his groin and external genitalia and Lugol’s iodine, hydrocortisone was administered showed gross necrotizing fasciitis with the epicenter of intravenously, and he continued to be treated with beta an abscess at his right groin extending up to the root of blockers. Broad spectrum antibiotics (penicillin, ceftriax- his right scrotum (Fig. 1). His right testis was not palp- one, and metronidazole) were started. His blood gases able separately. His left groin, scrotum, and left testis were normalized and his serum lactate dropped to 2.2 were normal. mmol/l after a few hours of treatment. In view of the Blood investigation revealed hemoglobin (12.5 gm/dL), gross sepsis which had triggered the thyroid storm, leucocytosis (33,000 cells/mm3), neutrophils 24×109/L, emergency wound debridement was planned. lymphocytes 7.2×109/L, and C-reactive protein (CRP) On exploration, the entire skin and subcutaneous part 320 mg/dL. A renal panel showed signs of acute kidney covering his right inguinal region, groin, and scrotum injury: creatinine 353 μmol/L and estimated glomerular were gangrenous (15×12 cm) and these areas were ex- filtration rate (eGFR) 29 mL/min/1.73m2. His total bili- cised. The depth of the necrotic patch extended approxi- rubin was 0.6 mg/dl and his albumin was low (22 mg/ mately 5 cm from his skin surface. His right spermatic dl). No significant pathology was found on an X-ray of cord and atrophic testis were gangrenous with slough; his chest and abdomen. Blood gas analysis showed meta- hence, a right orchiectomy with excision of the cord bolic acidosis with lactate 7.7 mmol/l. A thyroid function structures was done. Debridement of tissues in his right test revealed undetectable thyroid stimulating hormone inguinal area showed a thickened indirect hernia sac (TSH) <0.01 with grossly elevated free thyroxine (T4;59.1 with gangrenous appendix with pus and a 1 cm fecolith pmol/L). His thyroid peroxidase antibodies (TPOAb) and close to the base as the content. His deep inguinal ring TSH antibodies were elevated. He was intubated and was narrowed (0.5 cm). The sac was opened at the fun- transferred to our High Dependency (HD) unit for resus- dus. His appendix base was found to be healthy and an citation and active monitoring. appendicectomy was done (Fig. 1). Definitive hernia Fig. 1 Initial wound debridement and appendicectomy Rajaguru and Tan Ee Lee Journal of Medical Case Reports (2016) 10:263 Page 3 of 5 repair was not attempted in view of extensive infected enlarged thyroid gland with increased vascularity but tissues and his poor physiological status. no nodules; this finding supports a diagnosis of Grave’s He was extubated and transferred back to our High disease. Currently he is in good health with no evidence dependency unit for further monitoring. Post-procedure of hernia recurrence. His TSH and free T4 levels are his inflammatory markers normalized: white blood cells within normal limits; he is continuing with antithyroid were 9700 cells/mm3 and CRP was 54 mg/dL. He made medications with plans for radioactive iodine ablation an uneventful postoperative recovery; he received a de- at a later date. finitive inguinal hernia repair and diagnostic laparoscopy 48 hours after the debridement to check for the viability Discussion of his intestines and to rule out another abdominal The incidence of Amyand’s hernia is between 0.4 and 0.6 source of sepsis. The laparoscopic examination showed a %, which is smaller than the classical incidence of 1 % healthy terminal ileum, ascending colon, and congested which was based on older research [2]. The association caecum. Subsequently, the hernial sac with his appendix of appendicitis is even rarer and reported to be 0.07 to stump was reduced into his peritoneal cavity. The neck 0.13 % [2]. The majority of reported cases of Amyand’s of the sac was transfixed followed by right inguinal hernia are right sided, which can be explained by the modified Bassini’s herniorrhaphy (Fig. 2). A corrugated anatomical location of the organ and by the fact that rubber drain was kept in his inguinal region and the right-sided inguinal hernias are more common than left- wound was closed partially. He recovered well and the sided inguinal hernias. Few cases of left-sided Amyand’s drain was removed on the second day. Secondary skin hernia have been reported in the literature. An exces- suturing was done after 3 weeks. He was discharged sively long appendix, mobile caecum, situs inversus, and home with negative pressure wound dressing. An ultra- intestinal malrotation may be possible reasons for a left- sound of his neck was done, which showed diffusely side presentation [3]. Fig. 2 Bassini’s herniorrhaphy Rajaguru and Tan Ee Lee Journal of Medical Case Reports (2016) 10:263 Page 4 of 5 Acute appendicitis in Amyand’s hernia is usually Table 1 Losanoff and Basson's classification of Amyand's hernia caused by extraluminal obstruction due to pressure on Losanoff and Description Surgical management the hernia neck by a narrow deep inguinal ring or from Basson classification an intraluminal obstruction caused by a fecolith, al- [8] though the former is more common [4]. An appendix Type 1 Normal appendix within Hernia reduction, mesh will be retained after entering the hernia sac by forma- an inguinal hernia repair, appendicectomy tion of adhesions; inflammation of the appendix results only in young patients from changes in intra-abdominal pressure and frequent Type 2 Acute appendicitis within Appendicectomy through contraction of the abdominal wall muscles, which causes an inguinal hernia, no hernia, primary repair of strangulation of the appendix.
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