Intraoperative ultrasonography in nine dogs with intra-abdominal neoplasm suspect/Ultrassonografia intraoperatoria em nove caes com suspeita de neoplasia intra-abdominal.
Intraoperative ultrasonography (IOUS) has been used in medicine since the 1960s, first for the evaluation of brain tumors and renal and biliary calculi (KANE, 2004). Currently, IOUS is used in medicine for diagnosis and guidance during surgical exploration in a variety of organs, especially in neurosurgery, pancreatic, renal and hepatobiliary surgery (KANE, 2004; MARCAL et al., 2013).
Despite advancements in preoperative imaging with computed tomography and magnetic resonance imaging, IOUS provides diagnostic information during suigery that is capable of changing the suigical plan. Benefits of using this technique are intraoperative guidance and correct localization of lesions, assistance in determining lesion resection and suigical planning, metastatic assessment and local staging. These advantages make IOUS a helpful tool, mainly during oncologic surgery (HATA et al., 2011; MARCAL et al., 2013). In medicine, during oncological liver suigery, small non-palpable intraparenchymal tumors can only be detected by the use of IOUS (CERWENKA et al., 2004; HATA et al., 2011).
There are few studies investigating the use of IOUS in veterinary medicine. Most published studies are restricted to neurosurgery on the spinal cord (TANAKA et al., 2006; NANAI et al., 2007; BONELLI et al., 2015). Only two papers have described the use of IOUS to evaluate intra abdominal organs in dogs. JIMENEZ et al. (2011) evaluated the contrast-enhanced ultrasonography of normal canine jejunum using an intraoperative approach and SPINELLA et al. (2006) assessed the laparoscopic ultrasonography in six dogs with spontaneous abdominal disease.
To the authors' knowledge, the use of IOUS in conventional abdominal surgery in dogs with suspected intra-abdominal neoplasms lias not previously been described. The goals of this study were to present the performance, feasibility, advantages and difficulties of intra-abdominal IOUS technique in dogs with suspected abdominal tumors.
MATERIALS AND METHODS
A prospective cross-sectional and descriptive study was conducted over a period of 8 months at our Veterinary Teaching Hospital. Dogs referred to the ultrasonography service were considered for the study. Inclusion criteria were dogs of any age, gender or breed that had intra-abdominal oigan neoplasm suspected based on preoperative transabdominal ultrasound examination. All patients included were referred for exploratory laparotomy suigery. Preoperative transabdominal ultrasonography exams were performed using a high-resolution ultrasound machine (MyLab[TM]30 Vet Gold, Esaote, Italy). Transducers with convex (CA123, Esaote, Italy) and linear (LA523, Esaote, Italy) arrays, ranging from 5.0 to 12MHz, accordingto the size of the animal and the organ to be evaluated, were used. A systematic evaluation of all organs of the abdomen was performed, regardless of clinical suspicion. Radiology residents working under experienced radiologists' supervision performed the examinations.
The surgeon responsible for the case was informed of the preoperative transabdominal ultrasonography findings and these results were correlated with other clinical aspects in order to determine the surgical planning. The surgical procedure was performed within 48 hours of the ultrasound examination.
The abdomen was surgically accessed by ventral midline incision and the surgeon performed an initial evaluation of the neoplasm-suspected organ (inspection and palpation of organs where primary or metastatic lesions were suspected). After this evaluation, IOUS was performed using the same machine that was used preoperatively for transabdominal ultrasonography (MyLab[TM]30 Vet Gold, Esaote, Italy); however, only the linear transducer (LA523, Esaote, Italy) was used (6.6 to 12.0MHz). Scanning of the organ(s) of interest was performed, considering the clinical status of the patient; if unstable hemodynamic status was observed, the IOUS was interrupted in order to ensure that surgical time was not increased. The time required for IOUS was not recorded. The transducer, with a small amount of ultrasound gel, and its cable were covered with a sterile disposable cover for intraoperative equipment (MPaniagua, Brazil). The transducer was placed directly on the surface of the organs. Whenever possible, evaluated organ was partially or completely externalized from abdominal cavity to facilitate contact with the transducer. All IOUS examinations were undertaken by the surgeon; however, the radiologist who performed the preoperative transabdominal ultrasound was also present in the surgical room, assisting in the process for recording images.
The preoperative transabdominal and IOUS images were recorded and compared. New lesions were identified and the contribution and limitations of the IOUS were evaluated on a caseby-case basis. The main suspected neoplasm lesion was resected for histopathological confirmation of neoplasia. Additional lesions identified by IOUS were resected or biopsied, whenever possible, and sent for histopathological diagnosis.
Nine dogs with liver, spleen or bowel tumors were included in this study. Clinical characteristics, preoperative transabdominal ultrasound findings, surgeon findings and new lesions detected solely by IOUS are summarized in table 1. The preoperative transabdominal ultrasonography diagnosis suspected of neoplasm in the spleen (3 dogs), liver (2 dogs), both liver and spleen (2 dogs) and intestine (1 dog). Presence of intra-abdominal free fluid was observed in four dogs (two with strictly splenic tumors and two with both hepatic and splenic tumors). Abdominocentesis was performed and analysis of the fluid was consistent with hemoperitoneum in these dogs.
During surgery, neoplasm-suspected organs were inspected, and lesions were palpated in eight out of nine cases. In one dog (number 5), the spleen nodules were neither visible nor palpable by the surgeon.
Hepatic IOUS was performed in eight dogs (3 for metastatic research due to suspected splenic tumor, 2 with suspected primary or metastatic hepatic tumor and 3 with suspected of both splenic and hepatic tumors). Intestinal IOUS was performed in one dog (number 4), as was splenic IOUS (number 5). The hepatic IOUS was performed in all dogs with liver or spleen tumors; splenic IOUS was performed in dog number 5 due to lesions were not identified by the surgeon despite visible by preoperative transabdominal ultrasonography; and intestinal IOUS was performed in dog number 4 to help define margins for enterectomy.
IOUS identified additional lesions that were undetected by the surgeon in eight out of nine cases (all cases except the intestinal tumor). Comparing IOUS with preoperative transabdominal ultrasound, IOUS were able to identify more lesions that were previously undetected in seven out of the nine dogs, figure 1 shows examples of lesions detected by IOUS.
Information provided by IOUS directly influenced the surgical protocol or contributed to the surgical decision in all cases. Notably, limitations to the full use of IOUS were documented in six cases. The contributions and limitations of IOUS are shown in table 2.
Histopathology of the resected main lesions confirmed the neoplasm suspected in seven out of the nine dogs. Non-neoplasic lesions (including non-palpable lesions biopsied by IOUS guidance) were verified in dogs numbers 3 and 5. All dogs with splenic masses, except number 5, had splenic hemangiosarcoma (histopathologically confirmed). Hepatic tissue biopsied by IOUS guidance of these dogs confirmed metastatic hemangiosarcoma in four animals (numbers 2, 6, 7 and 9). Hepatic tissue biopsied from the left medial lobe of the dog number 8 (with splenic hemangiosarcoma) was compatible with fibrinous peritonitis. Dog number 1 had cholangiocarcinoma in the left lobe of the liver and portal fibrosis in the hepatic pappilary process of the caudate lobe. The histopathology of the dog with an intestinal mass (number 4) was compatible with a poorly differentiated sarcoma.
This study of cases showed the applicability of the IOUS technique in dogs during exploratory laparotomy for tumor investigation in the spleen, liver and bowel. The IOUS contributed to resection assistance and the decision regarding surgical protocol in all cases. Furthermore, the technique revealed new lesions that were neither visible nor palpable by the surgeon and/or that could not be observed via preoperative transabdominal ultrasound.
In all of the dogs in which IOUS was used in this study to evaluate the liver, it was possible to detect new non-palpable intraparenchynial lesions. The use of IOUS during oncological surgery played an important role in identifying new lesions, which generally led to changes in surgical management in accordance with the present study (CERWENKA et al., 2004; HATA et al., 2011). In medicine, IOUS in liver suigery, associated with bimanual palpation and visual inspection changed preoperative scheduled hepatectomy in 8% to 72% of the patients (HATAet al., 2011; HOCH et al., 2015). The value of IOUS is greater in detecting non-palpable small lesions (<lcm) located deep below the liver surface (HATA et al., 2011).
Based on IOUS findings, biopsy diagnosis of the new lesions was attempted. The ability of IOUS to provide real-time imaging of the organs of interest, with accurate small lesion detection and characterization establishes the important role of IOUS in intraoperative guidance for either biopsy or resection (MARCAL et al., 2013). However, differentiation between malignant and benign lesions is not possible with only IOUS evaluation. It is interesting to note that definitive histopathological diagnoses excluded the possibility of a neoplasm in some cases in the present study, including a number of lesions identified only by IOUS. These results reinforce the need for histopathological evaluation of all suspected lesions, identified by preoperative transabdominal ultrasound or IOUS (GASCHEN, 2009; MARCAL et al., 2013).
The use of IOUS during abdominal surgery allows for the direct application of a high-frequency transducer on the surface of the organ(s) of interest, with no obstacle in the abdominal wall to the penetration of sound waves. Moreover, it is possible to avoid other abdominal structures such as the bowel, when a parenchymatous organ is evaluated (LUCK & MADDERN, 1999). We were able to obtain highquality IOUS images in almost all cases using a linear high-frequency transducer. Exceptions included evaluation of the right and caudate hepatic lobes due to incomplete contact of the probe with the liver surface. The complete and careful IOUS scanning of all lobes of the liver was a limitation of our study. Because access was difficult, some lesions identified solely by IOUS could not be biopsied. However, resection of large hepatic masses (dogs number 1 and 3) prior to IOUS examination of the remaining lobes decreased the physical limitation of transducer access to the organ.
Small and specific intraoperative probes could have decreased the difficulty of access to the liver during IOUS in dogs, improving the quality of the assessment. Although, a standard transabdominal transducer can be used for intra-abdominal IOUS, a limitation is the bulkiness of the probe (KANE, 2004; PATEL & ROH, 2004).
Hepatic IOUS has not been described in dogs. Thus, there is no standardization for the use of this technique in this species. In human beings, IOUS of the liver is a methodical and systematic approach. The organ is mobilized by division of the round, falciform and triangular ligaments. Sonographically, the hepatic veins are followed from the vena cava to the periphery; all segment branches of the portal vein are identified starting from the liilus and the parenchyma is carefully examined for lesions. Size, number, location, hepatic segments involved and the relationship of the lesions to vascular and biliary structures are noted (CERWENKA et al., 2004; PATEL & ROH, 2004).
In the present study, hepatic IOUS was performed using lobar division aiming To evaluate all liver parenchyma. However, due to the difficulties reported, not all liver lobes were accessed properly. The access of the probe to all liver parenchyma was also influenced by the dogs size. The difficulty in access was greater in large, deep-chested dogs. Additionally, some patients were hemodynamically unstable during surgery and careful IOUS exam was not possible in those dogs. IOUS of the liver in people requires an additional 10-15 minutes of operating time (RIFKIN et al., 1987). IOUS-guided-biopsy of all new lesions also increases the surgical time, making it difficult in unstable patients who require a faster procedure. This limitation could be decreased with an experienced intraoperative sonographer (RIFKIN et al., 1987).
Role of IOUS in the real-time characterization of tumors and precise definition of their margins (MARCAL et al., 2013) was accomplished in our study, especially during the intraoperative examination of the dog with intestinal sarcoma (dog number 4). Lesion and its precise transition zone between the loss of mural detail and normal bowel were identified using IOUS. This information contributed to definition of the resection point, ensuring negative margins.
In comparison with preoperative transabdominal ultrasound examination, IOUS identified more lesions in dogs with splenic tumors (number 2, 6, 7 and 9) and free peritoneal fluid. The presence of free peritoneal fluid can increase the difficulty of the transabdominal ultrasonography (GASCHEN, 2009). Two dogs with free peritoneal fluid had only splenic tumors that were visible by preoperative transabdominal ultrasound. In addition, the same dogs had liver lesions identified upon inspection by the surgeon and additional countless intraparenchymal lesions visible solely by IOUS. These lesions were confirmed by histopathology as hepatic hemangiosarcoma.
A recent study evaluated the presence or absence of macroscopic liver lesions in 79 dogs with confirmed splenic hemangiosarcoma. Only 50% of dogs with grossly abnormal livers had hemangiosarcoma metastasis, and no dog with a grossly normal liver had metastasis that was detected by liver histopathology (CLENDANIEL et al., 2014). In accordance with our study, the use of liver IOUS might improve metastatic assessment and local staging in dogs with splenic hemangiosarcoma. A grossly normal liver during inspection by the surgeon can have lesions visible by IOUS, serving to direct the biopsy site.
An important limitation of this study is the small number of dogs included. Future studies should evaluate the value of IOUS during abdominal surgery in larger samples, which would allow for standardization of the technique and comparison of the sensitivity and specificity of IOUS with other imaging methods. Variability of lesions and the use of a standard transabdominal transducer during the surgery also limited the study. Unfortunately, there was not possible standardization of methods. However, additional occult lesions could be reported. Complications, such as contamination of the sterile field, did not occur, and the results were similar to those obtained with IOUS in medicine.
The present study demonstrated that IOUS can be a helpful tool during tumor resection surgery in dogs. IOUS may guide intraoperative biopsy and improve surgical staging in dogs with intra-abdominal tumors. It is a safe and non-invasive technique that should be encouraged in veterinary medicine.
BIOETHICS AND BIOSSECURITY COMMITTE APPROVAL
This study was approved by the Comite de Etica em Uso Animal do Campus de Ciencias Agricolas of the Universidade Federal do Parana, Brazil (protocol N. 011/2014).
Received 11.13.15 Approved 06.11.17 Returned by the author 07.15.17 CR-2015-1532.R2
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Daniella Matos da Silva (1) * Marco Antonio Ferreira da Silva (1) Giovana Paladino Vieira (1) Aline Iara Franciosi (1) Paula Cristina de Freitas Pezzini (1) Simone Domit Guerios (1) Tilde Rodrigues Froes (1)
(1) Setor de Ciencias Agrarias, Departamento de Medicina Veterinaria, Universidade Federal do Parana (UFPR), 80035-050, Curitiba, PR, Brasil. E-mail: danimscaMhotmail.com. *Corresponding author.
Caption: Figure 1--IOUS ill dogs with intra-abdominal tumors. Al) IOUS liver image ili a dog with cholangiocarcinoma (dog number 1). Presence of anechoic non-vascular mass in left medial hepatic lobe. A2) Image -guided drainage of mass content, syringes with content drained and mass appearance after left lobectomy. A2 and A3) Heterogeneous mass in left lateral hepatic lobe (black arrow) and anechoic mass in left medial hepatic lobe (white arrow). Bl) Liver IOUS image in dog with hepatic liemangiosarcoma (dog number 2) showing countless intraparenchymal hyperechoic nodules and (B2) liver fragment of the same region. C) Splenic IOUS image (dog number 5) showing non-palpable hyperechoic nodule (arrow). D) Non-palpable isoechogenic intraparenchymal nodule (white circle) in right medial hepatic lobe, visible solely by IOUS. Dog with cholangiocarcinoma in the left hepatic lobes (same case showed in A). E and F) Liver IOLTS image showing two intraparenchymal non-palpable hypoechoic nodules (black circles), measuring 0.9 cm in left medial lobe and 0.6cm in left lateral lobe (dog number 3).
Table 1--Clinical characteristics, preoperative transabdominal ultrasound findings, surgeon findings and new lesions detected solely by IOUS in nine dogs evaluated by intra-abdominal IOUS. Dog Age, Sex, Number, size, and probable location Breed of lesions (transabdominal ultrasound) 1 9y. F (a). 2 masses, 8 x 6 cm and 6 x 6 cm, in Rottweiler left hepatic lobes 2 12y, M (b). 1 mass, 6 x 5 cm, in tail of Labrador spleen (1) retriever 3 9y. F (a). 1 mass, 6 x 5 cm, heterogeneous in Labrador left hepatic lobes retriever 4 9y. M (b). 1 mass, 3 cm of extension, in the Standard small intestine Poodle 5 lly. F (a). Multiple nodules up to 1.5cm Schnauzer (diameter) in the spleen; nodules interspersed in a heterogeneous and hyperechoic liver 6 10y. M (b). 1 mass, 6 x 5 cm, in tail of spleen; Labrador multiple nodules up to 3 cm retriever (diameter) distributed throughout the liver parenchyma (1) 7 10y. F (a). 1 mass, 8 x 8 cm, in left hepatic Gemian lobes; multiple nodules up to 1.5cm Shepherd (diameter) distributed throughout dog the liver parenchyma; multiple nodules up to 2 cm(diameter) in the spleen (1) 8 12y, M (b). 1 mass, 7 x 6 cm, adjacent to the American Pit spleen Bull Terrier 9 9y. F (a). 1 mass, 5 x 4 cm, in the spleen (1) Gemian Shepherd dog Dog Surgical findings (inspection and New lesions detected palpation of the surgeon) solely by IOUS 1 Liver: 2 masses in left lobes, finn Liver: small nodule in consistency in papillary process of right medial lobe caudate lobe 2 Spleen: ruptured mass, active Liver: countless bleeding Liver: small nodules intraparenchynial nodules distributed throughout the surface of organ 3 Liver: 1 mass in left medial lobe Liver: 2 small nodules in left medial lobe and in left lateral lobe 4 Small intestine: 1 well delimited None mass 5 Liver: hepatomegaly, uneven surface None (3) with multiple small nodules 6 Spleen: ruptured mass, active Liver: countless bleeding Liver: small nodules intraparenchynial nodules distributed throughout the surface of organ, with active bleeding2 7 Liver: ruptured mass in left lateral Liver: countless lobe with active bleeding, multiple intraparenchynial nodules small nodules throughout the surface of organ Spleen: nodules with active bleeding 8 Spleen: 1 mass Liver: small nodule in right lateral lobe 9 Spleen: ruptured mass Liver: 2 small Liver: countless nodules in left lateral lobe and 1 intraparenchynial nodules in square lobe (a) Female, (b) Male, (1) Presence of free abdominal fluid, (2) Euthanasia during the surgery (inoperable lesions), (3) Lesion previously detected by preoperative transabdominal ultrasound. Table 2--Contribution and limitations of IOUS during surgery for the nine dogs presented in table 1. Dog Contribution of IOUS Limitations of IOLTS 1 Drainage of mass content (anechoic Difficult access to right non-vascular) in medial left hepatic lobes, impossible hepatic lobe, facilitating hepatic image-guided biopsy of lobectomy (Figure 1 A). Resection nonpalpable nodule * of hepatic papillary process of caudate lobe. Detection of new lesion in hepatic right medial lobe 2 Detection of countless nodules in None the liver (liver intraoperative staging). Decision of hepatic biopsy in right medial lobe that presented 3 palpable nodules and countless identified solely by IOUS (Figure IB) 3 Detection of new lesions in hepatic Difficult access to right left lobes and image-guided biopsy and caudate hepatic lobes of them (Figure IE and F) 4 Evaluation of transitional zone None between loss of mural detail and normal bowel. Definition of margins for resection point 5 Detection of non-palpable nodule in Difficult access to right spleen and its image-guided biopsy and quadrate hepatic lobes (Figure 1C) 6 Detection of countless nodules in None the liver (liver intraoperative staging). Support to decision of euthanasia because of number of intraparenchynial liver nodules and active bleeding 7 Detection of countless Difficult access to intraparenchynial nodules (liver). hepatic lobes. Support to decision of hepatic Hemodynamically unstable lobectomy only in lobe with active patient during surgery bleeding limiting careful IOLTS 8 Detection of new lesion in right Difficult of access to lateral lobe (liver). Liver right hepatic lobes, intraoperative staging (dog with impossible image-guided malignant spleen tumor) biopsy of nonpalpable nodule 9 Detection of new lesions in all Difficult access to liver. Liver intraoperative staging hepatic lobes. (dog with malignant spleen tumor). Hemodynamically unstable Decision of just incisional liver patient during surgery biopsy, due large number of nodules limiting careful IOLTS visible by IOLTS * incomplete contact of the probe with the liver surface.
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|Title Annotation:||clinica y cirugia; texto en ingles|
|Author:||da Silva, Daniella Matos; da Silva, Marco Antonio Ferreira; Vieira, Giovana Paladino; Franciosi, Ali|
|Date:||Sep 1, 2017|
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