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Shizheng Zhang

Publications and source records attributed to Shizheng Zhang.

5 recordsLinked to original sources
PubMed2005

The activation of the cortical hand area by toe tapping in two bilateral upper-extremities amputees with extraordinary foot movement skill.

Functional reorganization of the human brain after an arm amputation has been documented in several investigations, but as far as we know, there has been no report on amputees with skilled foot movement ability. To further assess the power of functional reorganization of the brain after an amputation, we investigated two bilateral upper-extremities amputees who were professional sculptors and painters with their feet. Performance tests showed that they possessed high foot movement ability. Functional MRI data indicated that toe tapping of the amputees not only activated the classical foot primary motor cortex, but also activated the hand area. In the T1-weighted MRI, the central sulci of both amputees kept their characteristic shape. Our study suggests that there is a remarkable power of neural plasticity in the motor cortex, and the maturation of the cortex develops in response to daily practice. The possible mechanisms of the reorganization are tentatively discussed.

Adult↗
PubMed2002

[CT manifestations of primary hepatic sarcoma].

OBJECTIVE: To assess the diagnostic value of CT to primary hepatic sarcoma. METHODS: The CT findings of 12 cases of primary hepatic sarcomas confirmed by operation and pathology, including leimyosarcoma, liposarcoma, and malignant fibrous histocytoma, 2 cases each, and angiosarcoma, carcinosarcoma, cystadenocarcinosarcoma, mesotheliosarcoma, fibrosarcoma, and malignant lymphoma, one case each, were analysed retrospectively. RESULTS: Only 2 out of the 12 cases of primary hepatic sarcoma were correctly diagnosed by CT before operation. The CT manifestations of primary hepatic sarcoma, against the operational and pathological findings, could be summarized as two types: solid mass type and cystic mass type. Eight cases were of solid mass type, including 2 cases of liposarcoma, and leiomyosarcoma, angiosarcoma, carcinosarcoma, methotheliosarcoma, fibrosarcoma, and malignant lymphoma, one case each. Plain scanning showed homogeneous or inhomogeneous low-density masses; enhanced scanning showed no marked enhancement or inhomogeneous enhancement, ringed peripheral enhancement, or nodular peripheral enhancement. Peripheral enhancement was a CT feature common to angiosarcoma and lymphoma. The characteristic CT manifestation of liposarcoma was an inhomogeneous mass with well-defined border and multiple intermingled septa. Four cases were of cystic mass type, including 2 cases of malignant fibrous histocytoma, and leimyosarcoma with post-operative recurrence and cystadenocarcinosarcoma, one case each, all manifesting a huge single cystic mass: unilocular in the case of leimyosarcoma with post-operative recurrence and multilocular in the other 3 cases. The wall and/or septa of the cyst had an uneven thickness and were markedly enhanced after contrast administration. Clear solid element and wall nodules were seen in the cystic mass of cystadenocarcinosarcoma. CONCLUSION: The CT findings of primary hepatic sarcoma are associated with the pathology of tumor. Some pathological patterns of primary hepatic sarcoma, such as liposarcoma and angiosarcoma, have their own characteristic CT manifestations. However, the diagnosis of most primary hepatic sarcoma lacking characteristic CT manifestations must be based on clinical and laboratory examinations and confirmed by pathology.

Adolescent↗
PubMed2002

[Safety analysis of CT-guided core needle lung biopsy].

OBJECTIVE: To study the safety of CT-guided core needle lung biopsy. METHODS: 290 cases of core-needle lung biopsy dated from April 1996 to April 2001 were studied. Complications of core-needle lung biopsy and their incidence and relationship with puncture site, diameter of the needle and depth of the target lesion were retrospectively analyzed. RESULTS: Of the 290 cases, 69 cases of mild pneumothorax (23.8%), 11 (3.8%) medium pneumothorax, 46 (15.9%) pulmonary bleeding, 2 (0.7%)hemoptysis, 2 (0.7%) bleeding in the thoracic cavity were identified. Drainage was done in 3 cases of pneumothorax and emergency operation was needed in 1 case of thoracic cavity bleeding. The rest of the complications resolved spontaneously after several days of bed rest. CONCLUSIONS: CT-guided biopsy is a reliable and relatively safe aggressive diagnostic method to get hologic diagnosis. Pneumothorax and pulmonary bleeding are the most common complications, which correlated with the depth of the target lesions in the lung and have no correlation with the lesion location.

Adult↗
PubMed2002

[Spiral CT urography and CT virtual endoscopy in detecting urological diseases].

OBJECTIVE: To evaluate spiral CT urography (SCTU) and CT virtual endoscopy (CTVE) in detecting urologic diseases. METHODS: SCTU was performed in 46 patients with urological diseases including renal neoplasms (2), paropelvic cysts (2), ureteral calculi (6), ureteral stenosis (4), ureteral neoplasms (2), double kidneys and ureter malformation (1), bladder neoplasms (28) and bladder endometreosis (1). The 6 patients with ureteral diseases and 29 patients with bladder diseases underwent CTVE based on spiral CT scan. All CTVE findings were compared with those of B-mode ultrosonography, intravenous urography (IVU), retrograde pyelography (RGP), conventional CT or cystoscopy. RESULTS: All upper urinary tract diseases and bladder diseases (28 cases) were detected by SCTU and CTVE scans and they were confirmed operatively or pathologically except one case of bladder neoplasm (diameter less than 5 mm) was missed. CONCLUSION: SCTU and CTVE have proved to be non-invasive and reliable in the diagnosis of urological diseases and are superior to IVU or conventional CT. CTVE can serve as a supplementary method to fiberoptic cystoscopy or ureteroscopy.

Adolescent↗