A rare case of torsion of wandering spleen in a multiparous woman.
Ultrasound of the abdomen indicated the absence of a normal spleen in the left hypochondrium (Fig. 2) and the presence of a sickle-shaped mass (18x9 cm) with echotexture similar to that of spleen in the hypogastrium and pelvis (Fig. 3), superior to the bladder. Its echotexture was relatively hypoechoic when compared with the rest of the splenic parenchyma and colour doppler revealed absent colour flow at hilum. These findings were suspicious of torsion of wandering spleen with infarction. The liver, gall bladder, both kidneys and pancreas were normal.
Subsequently, contrast-enhanced CT of the abdomen was performed, which confirmed the absence of sp leen in the left hypochondrium and its presence in the hypogastrium and pelvis. The spleen was enlarged. The entire parenchyma was hypodense and non- enhancing, Whirl sign was positive-suggestive of splenic infarction with torsion (3) (Fig. 4). No areas of calcification or haemorrhage were seen.
Coronal MR images reveals an ovoid or comma-shaped abdominal mass in hypogastrium region. (Fig. 5)
DISCUSSION: The aetiology of wandering spleen is divided into a congenital form and an acquired form. The congenital form results from a lack of development of the primary ligamentous attachments of the spleen: the gastrosplenic, splenorenal, splenocolic splenophrenic, splenopancreatic, presplenic fold, pancreaticocolic, and phrenocolic ligaments (4). An assumption made when hypothesizing that wandering spleen is of congenital origin is that the dorsal mesogastrium fails to fuse to the posterior abdominal wall during embryonic development.
The acquired form is believed to be caused by a laxity of these ligaments, which might be attributable to hormonal changes, splenomegaly, trauma or multiparity. Lack of ligamentous support allows the spleen to twist on its own pedicle. This torsion impairs venous return, causing congestion and capsular stretching. If torsion progresses, arterial supply is compromised, thus causing infarction, fibrosis and necrosis. Torsion complicates 64% of paediatric wandering spleen cases and the extent of torsion varies from 90[degrees] to 216[degrees].
The presentation of wandering spleen is varied. Patients may be (i) asymptomatic, (ii) present with a moveable lump in the abdomen, or (iii) present with acute, chronic or intermittent pain in the abdomen caused by torsion of the wandering spleen (5).
Early clinical diagnosis is difficult, and hence imaging modalities play an important role. The amount of vascular compromise can alter the intensity of pain secondary to capsular stretching, splenic engorgement and local peritonitis. Complications of acute splenic torsion include gangrene, abscess formation, local peritonitis, intestinal obstruction and necrosis of the pancreatic tail. Recurrent acute pancreatitis has been reported as a manifestation of this condition.
Multiple imaging techniques have been used to diagnose a wandering spleen with torsion, including plain radiography, barium studies, scintigraphy, ultrasound, CT and MRI.
Conventional radiography can sometimes show the absence of a splenic shadow in the left-upper quadrant, along with a central abdominal or pelvic mass.
However, plain radiography and barium studies are usually non-specific and may, in some cases, show the medial or superior displacement with extrinsic impression on the splenic flexure of the colon, along with a soft tissue mass in the central abdomen or pelvis, corresponding to the wandering spleen. Ultrasound and CT can both demonstrate the lack of splenic tissue in the left-upper quadrant and the characteristic comma shaped enlarged spleen in an ectopic location.
Sonography can also show involvement of neighboring structures such as the tail of the pancreas, which may be enlarged and show a changed echotexture if infarcted. However, sonography can often be hampered by bowel gas.
CT is the preferred modality for diagnosing a wandering spleen when torsion is suspected clinically or is based on imaging studies. Doppler study is useful for providing information on the splenic vasculature (parenchyma) and vascular pedicle. Doppler examination of the splenic artery distal to the bifurcation of the coeliac artery may show an increased resistive index of over 80% and low diastolic velocity in patients with acute torsion of the splenic vascular pedicle.
CT signs of a wandering spleen with acute torsion include: absence of spleen anterior to the left kidney and posterior to the stomach; a lower abdominal or pelvic mass, with homogeneous /heterogeneous splenic parenchyma and an attenuation value less than that of normal splenic tissue; whorled appearance of splenic vessels and surrounding fat; and the presence of secondary findings such as ascites and necrosis of the pancreatic tail. However, it is the whorled appearance of the splenic vessels and surrounding fat at the splenic hilum that is considered characteristic of torsion of wandering spleen.
Previously, splenectomy was the standard recommended treatment for wandering spleen, with or without the presence of torsion. However, present opinion favours treatment of a viable wandering spleen by splenopexy (4), especially in paediatric patients, to avoid the risk of post-splenectomy sepsis. The vascular status of the spleen is the key determinant in deciding if the spleen can be salvaged by splenopexy. However, splenectomy is indicated if the spleen is at functional risk of rupture. Although rare, splenic torsion should be recognized as a cause of acute abdomen. An increased awareness of this condition is required, along with the timely use of imaging that can help in making a prompt and accurate diagnosis for appropriate management.
(1.) Walker BA, Beighton PH, Murdoch JL. The marfanoid hypermobility syndrome. Ann Intern Med 1969; 71: 349-52.
(2.) Sodhi KS, Saggar K, Sood BP, Sandhu P. Torsion of a wandering spleen: acute abdominal presentation. J Emerg Med 2003; 25: 133-7.
(3.) Taori K, Ghonge N, Prakash A. Wandering spleen with torsion of vascular pedicle: early diagnosis with multiplaner reformation technique of multislice spiral CT. Abdom Imaging 2004; 29: 479-81.
(4.) Allen KB ,Andrewa G. Pediatric wandering spleen-the case for splenopexy: review of 35 reported cases in the literature. J Pediatr Surg 1989;24:432
(5.) Romero JR, Barksdale EM Jr. Wandering spleen: a rare cause of abdominal pain. Pediatr Emerg Care 2003; 19: 412-14.
S. Venkateshwar Rao , Shirish Paul Ganta , N. Kiran Raju , V. N. Narvekar , V. Sivaleela 
[1.] S. Venkateshwar Rao
[2.] Shirish Paul Ganta
[3.] N. Kiran Raju
[4.] V. N. Narvekar
[5.] V. Sivaleela
PARTICULARS OF CONTRIBUTORS:
[1.] Associate Professor, Department of Radiology, Asram Medical College.
[2.] Assistant Professor, Department of Radiology, Asram Medical College.
[3.] Assistant Professor, Department of Radiology, Asram Medical College.
[4.] Professor and HOD, Department of Radiology, Asram Medical College.
[5.] Professor, Department of Radiology, Asram Medical College.
NAME ADDRESS EMAIL ID OF THE CORRESPONDING AUTHOR:
Dr. S. Venkateshwar Rao, Associate Professor, Department of Radiodiagnosis, Asram Medical College, Eluru, West Godavari Direct, Andhra Pradesh-534005.
Date of Submission: 25/12/2014.
Date of Peer Review: 26/12/2014.
Date of Acceptance: 30/01/2015.
Date of Publishing: 09/02/2015.
|Printer friendly Cite/link Email Feedback|
|Title Annotation:||CASE REPORT|
|Author:||Rao, S. Venkateshwar; Ganta, Shirish Paul; Raju, N. Kiran; Narvekar, V.N.; Sivaleela, V.|
|Publication:||Journal of Evolution of Medical and Dental Sciences|
|Date:||Feb 9, 2015|
|Previous Article:||A case of recurrent pleural effusion from pancreatico pleural fistula: diagnosis and management.|
|Next Article:||Comparative study of forearm fractures treated with locking compression plate limited contact dynamic compression plate.|