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Contrast-Enhanced Computed Tomographic Findings of the Wandering Spleen: A Case Report

Wandering spleen is a rare entity that defines abnormal localization of spleen due to various causes. Wandering spleen is prone to rotate on its peduncular axis and finally torsion and infarction. Contrast-enhanced computed tomography can visualize the torsioned peduncle and non-enhanced parenchyma with contrast medium. A 60-year-old woman who had abdominal pain was admitted to ER. Contrast-enhanced computed tomography depicts the abnormal localization of spleen and absence of contrast medium in the parenchyma and peduncle. Diagnosis was torsioned wandering spleen. Contrast-enhanced computed tomography is very important useful modality for diagnosis of torsioned wandering spleen.

cell count of 6700/mL (reference range being 4400-11000/ mL), and a C reactive protein level of 58.5 mg/L (reference range being 0-5 mg/L). A contrast-enhanced computed tomographic (CECT) examination was performed with Toshiba Aquilion 80 (Tokyo, Japan). Iomeprol 300/100 mg (Iomeron 300/100 mg Bracco UK Ltd.) was used as intravenous contrast medium with 4 ml/s injec-tion rate. CECT disclosed that the spleen was not in place, and that there was a soft tissue lesion in the mid-abdomen. This lesion was not enhancing with iodinated contrast, and it was attached to the main vascular structures with a peduncle (Figs. 1, 2). The lesion was compatible with a wandering spleen. There was no well-known disposing factor, such as ligamental laxity or congenital malformation. It was found that the arterial peduncle feeding this wandering spleen had rotated on its axis, and arterial contrast enhancing was present only at the mid-section of this torsioned peduncle (Figs. 3, 4). The patient was operated and underwent an uncomplicated splenectomy procedure. Surgery revealed that the spleen was not in its normal location but was at the midline of the abdomen, and also that the peduncle was torsioned and thus the spleen necrosed.

Discussion
Van Horne first described the entity "wandering spleen" in 1667 in an autopsy specimen. [5] Hatfield et al., [6] on the other hand, were the first to define the ectopic spleen using selective angiography pre-operatively, in 1976. Congenital and acquired reasons can cause wandering spleen. Congenital causes are complete or incomplete development of the ligaments of spleen. Acquired causes are increased laxity of ligaments due to hormonal changes secondary to multiparity, lymphoma, and myeloproliferative disorders. [7] Patients with a wandering spleen may present with intermittent pain attacks secondary to pedun-cular torsion. Cases with complete torsion may present with acute abdomen findings. Besides abdominal pain, patients may develop abdominal distension, nausea, and vomiting. Due to torsion detorsion, the pain can be present as intermittent. [4] One paper reported that the wandering spleen could lead to complaints of enuresis due to the ectopic spleen's indenting pressure on the bladder. In the paper's presented patient, the cause of the wandering spleen phenomenon was a defect in the dia-phragm, and the patient's enuresis complaints had ceased following the repair of this defect. [8] The critical question to be solved in wandering spleen cases is if there is a peduncular torsion and thus a secondary splenic ischemia and infarction. This is exactly why an early diagnosis is so vital. Various imaging modalities may  be used for the diagnosis. Conventional radiography, ultrasonogra-phy (US), color Doppler ultrasonography (CDUS), CT, and CECT are among these modalities. [7] Direct radiograms may show that the spleen density is missing in the normal location and there are intestinal segments there instead. Besides, a scanogram, as was the case in our patient, may reveal the presence of the wandering spleen as an ectopic density (Fig. 5).
US, on the other hand, may not only demonstrate that the spleen is not in place, but it may also reveal the very location of the wandering spleen. US may also disclose the rotation and torsion of the splenic peduncle. With Doppler US, one can examine the vascular supply condition of both the pe-duncle and the splenic parenchyma. US is a cheap and easy-applied modality with no ionized radia-tion. But US is a user-dependent modality; therefore, US must be performed by experienced sonog-raphers.
As was the case in our patient, a CECT examination may demonstrate the ectopic location of the wandering spleen, together with its increased size due to congestion secondary to torsion, and the lack of parenchymal contrast enhancement. CECT may also delineate the status of the arterial and venous vascularization and the devascularized segment of the peduncle with high accuracy. CECT has the highest contrast resolution, and therefore has the high diagnostic capability. Sagittal and coronal reformation increases the diagnostic evaluation. CT cause ionizing radiation, and this is the major dis-advantage of this modality. IV contrast medium can cause side effects, such as renal impairment and anaphylaxis.

Conclusion
The torsion of the wandering spleen is a rare but a very important clinical entity. It is a serious cause of acute abdomen. CECT is a very effective modality in the diagnosis of this entity, providing a fast and accurate management of the emergency. In arterial phase coronal oblique reformatted CECT image depicts that wandering spleen cannot take up contrast medium and has lost density when compared with liver. The contrast medium is discon-tinued in the torsioned splenic artery (black arrow).