|Year : 2005 | Volume
| Issue : 4 | Page : 421-426
|Efficacy of high resolution transabadominal sonography of the fluid filled stomach in the evaluation of gastric carcinomas
S Singh, V Chowdhury
Department of Radiodiagnosis, Maulana Azad Medical College and Associated Lok Nayak Hospital, New Delhi, Jawahar Lal Nehru Marg, New Delhi - 110002, India
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| Abstract|| |
To evaluate the efficacy of high-resolution transabdominal sonography of the fluid filled stomach in the evaluation of gastric carcinomas.
Materials and Methods:-
Fifty one patients with a clinical diagnosis of gastric disease were included in the study. The patients were taken for conventional abdominal sonography followed by high resolution transabdominal sonography of the fluid filled stomach. An UGI endoscopy was done in all 51 cases and biopsy taken from pathological / suspicious site. The accuracy of high resolution sonography of the fluid filled stomach was evaluated in the diagnosis of gastric carcinoma as compared to endoscopy.
High resolution sonography diagnosed all 17 cases of gastric carcinoma while endoscopy failed to diagnose one case of scirrhous carcinoma. Sonography underestimated the intraluminal extent in two cases while endoscopy underestimated the extent in three cases. Sonography provided an estimate of the exogastric extent in the majority of the cases not available by endoscopy. However endoscopy has the advantage of direct biopsy being taken and histopathological correlation was obtained.
High resolution sonography is a supportive diagnostic modality and is a supplementary diagnostic procedure to endoscopy.
Keywords: Gastric, carcinoma, High resolution ultrasound, fluid filled stomach
|How to cite this article:|
Singh S, Chowdhury V. Efficacy of high resolution transabadominal sonography of the fluid filled stomach in the evaluation of gastric carcinomas. Indian J Radiol Imaging 2005;15:421-6
|How to cite this URL:|
Singh S, Chowdhury V. Efficacy of high resolution transabadominal sonography of the fluid filled stomach in the evaluation of gastric carcinomas. Indian J Radiol Imaging [serial online] 2005 [cited 2020 Apr 10];15:421-6. Available from: http://www.ijri.org/text.asp?2005/15/4/421/28763
| Introduction|| |
It has recently been shown that dedicated transabdominal ultrasound performed after ingestion of water and injection of a hypotonic agent along with the use of high frequency transducers provides detailed and unique evaluation of the stomach. Ultrasound is often used as the first imaging modality in a large variety of abdominal complaints and clinically unsuspected gastric carcinomas may be imaged first by it.
| Material and methods|| |
A total of 51 patients with a clinical diagnosis of gastric disease were included in the study. Detailed clinical history and relevant points in clinical examination and relevant investigations were carried out. The patients were then subjected to conventional abdominal sonography followed by high resolution sonography of the fluid filled stomach. An UGI endoscopy was done on all 51 cases. Any abnormality detected was noted and biopsy taken from pathological or suspicious site. In patients who underwent surgery operative findings were noted and histopathological correlation obtained wherever possible.
Ultrasound examination was performed using a real time ultrasound with 3 MHz, 5 MHz and/or 7.5 transducers as required. Patients were taken up for examination empty stomach after overnight fasting and in cases of gastric outlet obstruction after Ryle's tube aspiration. The patients were given 500 ml to a maximum of 1000 ml of tap water to drink. At the same time, 20mg Hyoscine N/butyl bromide (Buscopan) was injected intravenously to achieve optimal distension and to suppress gastric peristalsis.
Scanning was done in longitudinal, transverse and left sided subcostal oblique positions. The aim of the procedure was to remove air from the segment of the stomach under investigation by appropriate positioning.
The normal stomach was identified using the following criteria:-
1. Good distensibility of the stomach in all sections with a uniform wall thickness of upto 4mm to 5mm. In the distal antrum this figure is exceeded by 2-3 mm.
2. Uninterrupted layering of the wall.
3. Identification of the five layers in the gastric wall. From the inside to the outside a hyperechoic layer is followed by alternating hypoechoic and hyperechoic layers [Figure - 1].
Layers 1 and 2 adjacent to the lumen represent the mucosa.
Layer 3 which is hyperechoic represents the submucosa.
Layer 4 which is hypoechoic represents the muscularis propria.
Layer 5 which is hyperechoic corresponds to the serosa and subserosal fat.
4. Identification of continuous peristalsis when the effect of Buscopan wear off.
The diagnosis of gastric lesions was based on:-
i) Wall thickness more than 5mm, in the distal antrum more than 8 mm.
ii) Loss of normal wall stratification.
iii) Circumscribed widening of the individual layers.
Iv) Luminal narrowing
v) Absent or reduced persistalsis.
vi) Considerable paucity of echoes in the wall.
vii) Abnormalities of the surrounding connective tissues.
| Results|| |
Seventeen patients of gastric carcinoma were present in the study. The age range was between 31-80 years with highest number of patients in the age group 61-70 years. There were eleven men (64.79%) and six women (35.29%).
The commonest symptoms with which patients of gastric carcinoma presented were weight loss (76.4%) and abdominal pain (70.5%). This represented the advance stage of the disease at which most of our patients present.
The commonest site of gastric involvement in carcinoma was the antrum - nine out of 17 cases (52.94%). The gastro-oesophageal junction with involvement of fundus was seen in four (23.5%) cases, the body was involved in three cases and diffuse involvement of the stomach was seen in one case [Table - 1].
In all 17 patients of gastric carcinoma (100%) wall layering was completely lost. Wall thickness was increased in all the cases (100%). Patients with gastric carcinoma had a wall thickness ranging from 10mm to 32.4mm with an average wall thickness of 22.5 mm.
There was luminal narrowing and reduced peristalsis seen in all the 17 cases. Heterogeneous intraluminal masses were seen in 14 out of 17 (82.35%) cases of gastric carcinoma [Figure - 2]a, b. Serosal involvement was seen in 13 out of 17 (76.47%) cases [Table - 2].
Para-aortic lymph nodes were seen in four patients [Figure - 3] and hepatic metastases was detected in all the three patients [Table - 3]. Sonography failed to detect involvement of transverse mesocolon seen at operation in two patients. Involvement of the gastrohepatic and gastrocolic ligament seen at operation in one patient was not seen preoperatively on sonography.
| Discussion|| |
The most common site of involvement was the antrum nine out of 17 cases (52.9%). Our findings are in agreement with the well-established fact that carcinoma stomach most commonly involves the antrum .
All patients of gastric carcinoma showed a complete loss of wall stratification [Figure - 4]. The wall echotexture was hypoechoic with heterogeneous areas in the majority of cases. Luminal narrowing and reduced peristalsis was observed in all the 17 cases (100%) [Figure - 5]a,b. There was increase in wall thickness in all cases ranging from 10 mm to 32.4 mm with an average wall thickness of 22.5 mm. Heterogeneous intraluminal masses were seen in 14 out of 17 cases (82.35%) [Figure - 6]a,b.
Our findings are in concordance with that of Yeh and Rabinowitz  who stated that ultrasonographic features of gastric tumours can be divided into three main categories:-
a) thickened gastric wall due to infiltration by tumour.
b) A mass
c) A combination of two
The sonographic features seen were also in agreement with that of Worlieck et al  who stated that a localized carcinoma may be seen as a hypoechoic or moderately echoic circumscribed wall thickening with irregular contours and interrupted wall layering and a scirrhous carcinoma may be visualized as an extensive predominantly hypoechoic mural infiltration, partly uniform partly irregular or polypoid thickening of the wall; a lack of distensibility of the stomach wall with narrowing of the lumen or stenosis.
Though it is not always possible to differentiate between benign and malignant disease on the basis of sonography alone, complete disruption of wall layering and presence of heterogeneous intraluminal masses favoured the diagnosis of malignancy. Wall thickening of a lesser extent (5-8 mm) is also seen in chronic gastritis and gastric ulcer but wall stratification is maintained in these cases ,.
High resolution sonography underestimated the intraluminal extent in 2 cases while endoscopy underestimated the extent in three cases of carcinoma GE junction with involvement of the fundus. On sonography, the involvement of the lower dorsal oesophagus was not identified in one case owing to the inability to visualize it on sonography while in the other the involvement of the fundus was not identified. This was related to the poor visualization of the fundus in this case; the fundus being a difficult area to evaluate on sonography because of overlying ribs ,. In these cases, the involvement of the fundus was missed on endoscopy owing to the inability of the endoscope to negotiate the area of growth / stricture at the GE junction.
In the single case of scirrhous carcinoma of the stomach diffuse circumferential wall thickening was seen on sonography [Figure - 7]a and barium showed reduced distensibility with mucosal ulcerations [Figure - 7]b.
Endoscopy interpreted the case of scirrhous carcinoma as normal. Owing to the diffuse wall thickening seen on sonography lymphoma was considered in the differential diagnosis in addition to diffuse carcinoma and a repeat endoscopy was undertaken. Repeat endoscopy in this case, revealed small mucosal ulcerations but the endoscopic biopsy was negative. A third repeat endoscopic biopsy revealed it to be a case of diffuse carcinoma [Figure - 8]. This may be attributed to the well known difficulty of endoscopy in diagnosing these tumours as the overlying mucosa appears normal, the diagnostic yield is higher in exophytic lesions than in infiltrative lesions ,.
Serosal involvement was seen in 13 out of 17 cases of gastric carcinoma [Figure - 9]. Out of the four patients where the serosa appeared intact on sonography, serosal involvement with involvement of loco-regional lymph nodes was seen at surgery in 2 cases.
Invasion of the pancreas was identified by sonography in two patients. In one case the tumour mass was seen to directly continue in the pancreatic region, in the other case pancreatic infiltration was identified as a focal change in the pancreatic echotexture in the region of the tumour mass. The invasion of the pancreas was confirmed at surgery in both the cases. Simeone et al  had shown the role of ultrasound in the assessment of the invasion of pancreas by gastric carcinoma.
Invasion of the transverse mesocolon in two patients and invasion of the gastrohepatic and gastrocolic ligaments seen in one patient at surgery was not seen on sonography preoperatively.
Derchi et al  had stated that when patients of gastric carcinoma are referred for evaluation of liver metastases it is worthwhile to get additional information about tumour extent by performing a complete sonographic examination of the abdomen and pelvis and by making an attempt to visualize the primary neoplasm and its relations to surrounding structures. Preoperative knowledge of both local and distant tumour extent may greatly help surgeons to plan more accurately their therapeutic approach and may even obviate the need for laparotomy with far advanced disease who may receive other types of treatment.
In our study liver metastases were seen in three patients. Hypoechoic lesions were seen in two patients, both hypoechoic and hyperechoic lesions were seen in the third patient. Para-aortic lymphadenopathy was identified at sonography in four patients. Free fluid was seen in six patients, only four of these patients had presented with ascites clinically.
Thus, though sonography underestimated the exogastric extent in a few cases it did provide a rough estimate of the extent in the majority of the cases not available by endoscopy.
| Conclusion|| |
Thus high resolution transabdominal sonography of the fluid filled stomach allows unique and detailed evaluation of the gastric wall layers not available by either endoscopy or barium meal. It not only shows the thickened gastric wall but also shows which layers are involved. The pattern of involvement of wall layers, echotexture of the wall as well as the extent of wall thickness can suggest the diagnosis of malignant lesions. Heterogeneous intraluminal masses, hypoechoic wall echotexture, luminal narrowing, reduced peristalsis and circumferential wall thickening with loss of wall layering suggest a malignant lesion while increased wall thickness with maintained wall stratification suggest a benign lesion. Intraluminal abnormalities, contiguous structures, adjacent extrinsic masses are also well demonstrated. Sonography allows better evaluation of the entire extent of lesions were the endoscope cannot negotiate the proximal growth or area of narrowing in a cost effective manner without any radiation hazard.
Thus the study concludes that high resolution sonography of the fluid filled stomach is a supportive diagnostic modality and suggests itself as a supplementary diagnostic procedure to endoscopy.
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212, SFS Flats, Phase IV, Ashok Vihar, Delhi - 110052
Source of Support: None, Conflict of Interest: None
[Figure - 1], [Figure - 2], [Figure - 3], [Figure - 4], [Figure - 5], [Figure - 6], [Figure - 7], [Figure - 8], [Figure - 9]
[Table - 1], [Table - 2], [Table - 3]
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