Biomedical subjects
Publications and source records attributed to Y L Wan.
A case of spontaneous intraperitoneal bladder rupture that was spontaneously healed in a one-year-old girl is reported. The subsequent drainage of the contrast medium in the peritoneal cavity via the urethral catheter after retrograde cystography implies that such a rupture may be successfully treated by a urethral bladder drainage and antibiotics.
A case of retained surgical sponge was imaged by ultrasound and computed tomography (CT). Sonography revealed a hypoechoic mass with areas of high echoes and acoustic shadowing. An experiment revealed that the high echoes were attributed partly to the presence of numerous interfaces of sponges. The sonographic detection of a mass with high echoes casting acoustic shadows should alert radiologists to the possibility of retained surgical sponges even if there is no gas or calcification on CT scans.
A case of exophytic gastric hemangioma with intratumoral bleeding due to torsion of the tumor pedicle is reported. A radiograph showed a mass without phleboliths. Computed tomography (CT) demonstrated a 14-cm mass with high densities due to hemorrhage, which was contiguous to the stomach and extended to the pelvis. The tumor showed no remarkable enhancement on post-enhanced CT due to torsion of the tumor pedicle.
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Angiolipoma of the breast is a rare benign fatty tumor that can be mammographically confused with breast carcinoma. We herein report such a case presenting as a partial obscured mass with microcalcification on mammogram. Sonogram revealed an encapsulated hyperechoic nodule with homogeneous internal echo. Microscopic evaluation revealed abundant adipose tissues with evidence of proliferating vessels and intravascular hyaline thrombi. To our knowledge, angiolipomas of the breast containing microcalcification secondary to intravascular thrombi had not been previously reported.
Unintentional ingestion of foreign bodies is common in daily life. The unintentional ingestion of sharp foreign bodies such as toothpicks, fish bones and chicken bones carries a significant risk of perforation of the gastrointestinal tract. Herein, we report a case of hepatic inflammatory mass complicated by the perforation of an ingested toothpick that had a distinctive enhancement pattern on dynamic computed tomograms (CT). Understanding the phenomenon of enhancement in triphasic CT study is the basis in differentiating liver neoplasms.
Dynamic enhancing feature in mediastinal hemangioma was rarely reported. Slow, gradually increasing and prolonged contrast stains are the diagnostic hints in our case that avoid the hemorrhagic catastrophe from transthoracic core needle biopsy. A rare finding of an aberrant vessel entering into the tumor was valuable for operative planning. Dynamic computed tomography (CT) can provide more information for evaluation in such cases.
The purpose of this study was to describe the computed tomographic (CT) features of intralesional calcifications in abdominal malignant fibrous histiocytomas (MFH). Forty-three pathologically proven abdominal MFH with preoperative CT were retrospectively reviewed, of which seven tumors with intralesional calcifications were studied with pathohistologic correlation. All seven calcified abdominal MFH belonged to the storiform-pleomorphic subtype with peripherally located calcifications that appeared as either lumpy (three cases) or ringlike (four cases), which were due to the presence of variable amounts of osseous (six cases) and chondroid metaplasia (two cases). About 16% of abdominal MFH, especially the storiform-pleomorphic subtype, exhibited metaplastic calcifications which were characteristically located at the periphery of the tumor and appeared as either lumpy or ringlike on CT.
This is a presentation of a case of tuberous sclerosis with multifocal hamartomas in the retroperitoneum, both kidneys, and the liver. Lymphangiectasia and numerous ectatic lymphatic channels penetrating through the retroperitoneal angiomyolipoma were demonstrated by lymphography and computed tomography. The findings in our study may document the presence of degenerative change in the lymphatic system--not just in elastic vessels--an association which has not yet been reported in the radiological literature.
PURPOSE: The purpose of this work was to evaluate the helical CT and CT angiography (CTA) findings of anomalous systemic artery (ASA) to the basal segments of the left lower lobe (LLL). METHOD: Three patients (two had hemoptysis, one was asymptomatic) with blotchy nodular density in the LLL revealed on chest radiographs underwent helical CT and CTA. Bronchoscopy was performed in two of these patients. Angiography and surgery were performed in one patient. RESULTS: All three patients demonstrated characteristic helical CT and CTA findings including 1) a sigmoid-shaped ASA originating from the lower descending thoracic aorta, with a distal bulbous configuration and four arterial branches supplying the basal segments of the LLL; 2) absence of an interlobar pulmonary artery or presence of a small artery lateral to the truncus basalis; 3) engorged vascular markings in the basal segments of the LLL; and 4) normal tracheobronchial tree and lung parenchyma. CONCLUSION: The findings in the present three cases suggest that the use of invasive studies such as angiography or bronchoscopy may be obviated in the diagnosis of ASA to the LLL because diagnosis can be provided through a clear set of criteria on helical CT and CTA.
Renal cell carcinoma is extremely rare in children. A case is reported here of renal cell carcinoma in a seven-year-old boy whose clinical manifestations were fever and right loin pain. Imaging studies revealed a solid mass in the right kidney and a metastatic nodule over the middle lobe of the right lung. Right nephrectomy and middle lobectomy of the right lung were performed. Pathologic examination revealed a renal cell carcinoma with predominance of clear cells. Despite Stage IV, the patient is still alive without chemotherapy and radiotherapy. It should be emphasized that renal cell carcinoma should be included in the differential diagnosis of pediatric renal solid masses, particularly in older children and adolescents.
Superior mesenteric artery (SMA) syndrome is a rare clinical disease. We present a case of a 15-year-old girl with complaints of vomiting and epigastric pain during on admission. Her general appearance was tall and thin. She had the upper gastrointestinal (UGI) barium study, angiography and abdominal sonography performed to confirm the diagnosis of SMA syndrome. She received medical treatment and was discharged after the symptoms were relieved. Her followup had a smooth course in our out-patient department.