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Biomedical subjects

I Menchi

Publications and source records attributed to I Menchi.

At least 19 recordsLinked to original sources
PubMed2006

AEC set-up optimisation with computed radiography imaging.

Phototimer set-up is a critical procedure for dose and image quality optimisation in computed radiography (CR) systems. While a conventional radiography automatic exposure control device (AEC) can be calibrated in order to gain a constant optical density on the film independent of beam quality and patient size, CR detectors present a high dynamic range which allows a much larger dose interval, but with different image quality levels. CR leads to a less frequent exam repetition, but may produce quite noisy images if the exposure level on the plate is not correct. The aim of this work is to evaluate the performance of a CR plate (Agfa MD40) in order to optimally calibrate an AEC device. The plate response has been characterised in terms of digital signal, exposure on the plate and signal-to-noise ratio for different beam qualities, in a patient of standard size.

Calibration↗
PubMed2003

Paraffinoma of the knee.

We present the case of a 90-year-old man with a swollen, painful knee and a history of paraffin injections. Radiography showed soft tissue streaky and nodular calcifications without erosions. MR imaging showed globular areas of low signal intensity on T1- and T2-weighted images which became even more hypointense on STIR sequences, and an infiltrative hypointense region containing areas of high signal on T1-weighted, T2-weighted and STIR images. Biopsy confirmed soft tissue foreign body granulomata, fibrous reaction and areas of inflammation. We believe this to be the first report of MR imaging of paraffinoma outside the breast.

Aged↗
PubMed1999

Endorectal coil MR imaging findings in hemospermia.

The purpose of this study was to illustrate the spectrum of abnormalities found at endorectal coil magnetic resonance (MR) imaging in patients with hemospermia. Ninety patients aged between 23 and 71 years (mean age 41 years) presenting with hemospermia underwent evaluation with endorectal coil MR imaging at 1.5 T. Duration of hemospermia ranged between 5 days and 4 years (mean 15 months). MR examination protocol included T1-weighted spin-echo (SE) and T2-weighted fast SE MR images obtained in the sagittal, coronal, and axial planes. Abnormalities were observed on endorectal-coil MR images in 49 of 90 patients (54%). Blood within the seminal vesicle or the ejaculatory duct was recognized in 23 of 90 patients (25%). Dilatation of the seminal vesicles or the ejaculatory duct was observed in 31 of 90 patients (34%). Cystic lesions were identified in 14 cases, eight of which involved the utriculus and six the ejaculatory duct. Calculi within the seminal vesicles were depicted in seven patients. No malignant disease was demonstrated. In conclusion, despite the evidence that hemospermia is most often a benign and self-limiting condition, we found that endorectal coil MR imaging can detect abnormal findings in more than half of the patients, and may be helpful in assessing the level at which hemorrhage occurred and in defining the cause of the disease.

Adult↗
PubMed1998

Prostatic abscess: diagnosis and treatment.

OBJECTIVE: Prostatic abscesses are uncommon in clinical practice because early antibiotic therapy has reduced complications of prostatitis. Prostatic abscess mainly affects diabetic and immunosuppressed patients. The organisms most frequently involved are Escherichia coli and Staphylococcus, whereas gonococcus is rarely encountered. The results in eight men with prostatic abscess, five of whom were treated with sonographically guided percutaneous drainage, are reported. The diagnosis, clinically suspected in only three patients, was confirmed by transrectal sonography. All patients experienced complete abscess resolution. CONCLUSION: Transrectal sonography is the most reliable imaging method to diagnose prostatic abscess. Percutaneous transperineal or transrectal drainage is the first choice for therapy because of the lower risk of complication compared with surgery.

Abscess↗
PubMed1997

The morphology of the prostatic capsule with particular regard to the posterosuperior region: an anatomical and clinical problem.

The composition of the prostatic capsule is important from a clinical point of view, since it is considered to be a barrier against the spread of prostatic tumours. Clinical follow-up demonstrates that apparently intracapsular tumours, particularly in the posterosuperior region of the gland, are frequently understaged at clinical diagnosis. The morphology of the prostatic capsule was studied in 6 cadavers. In each case the prostate was obtained in one block together with the basal portion of the bladder, the seminal vesicles, the anterior wall of the rectum and the periprostatic connective tissue. Part of the material was plastinated, while the remainder was studied using histological and immunohistochemical methods. The prostate was found to be surrounded by connective tissue abundant with smooth muscle cells, and continuous with the stromal septa which subdivide the glandular tissue. A rich network of blood vessels was identifiable. In some regions, particularly in the posterosuperior region, a real capsule was not identifiable. The connective tissue seemed to constitute a continuum between the prostate gland and neighbouring organs, in particular, a connective tissue barrier between the prostate and the seminal vesicles was completely absent. Therefore, due to the absence of a capsular barrier and to the presence of a rich vascular network a prostatic tumour which begins in the posterior region of the gland should be considered as potentially extracapsular.

Adult↗
PubMed1997

Prediction of pathological tumor volume in clinically localized prostate cancer: value of endorectal coil magnetic resonance imaging.

The purpose of this study was to determine whether endorectal coil magnetic resonance imaging (MRI) enables accurate assessment of pathologic tumor volume in patients with clinically localized prostate carcinoma. Twenty-four patients with biopsy-proved prostate carcinoma underwent MRI at 0.5 T before radical prostatectomy. Tumor volumes were determined independently on axial fast-spin-echo (SE) T2-weighted MR images and whole-mount pathology slides of the surgical specimens. At pathology, tumor volumes ranged from 0.17 to 9.42 cm3 (mean +/- SD, 3.11 +/- 2.99 cm3). A strong correlation (r = .944) was found between measurements of tumor volume based on MR images and pathological specimens. The error was less than 0.5 cm3 in 14 cases, in the range of 0.5-1 cm3 in 7 cases, and more than 1 cm3 in 3 cases. By using an MR tumor volume of 2 cm3 as cutoff value, extracapsular tumor spread could be predicted with a sensitivity of 81.2%, a specificity of 100%, and an accuracy of 87.5%. Tumor volume determinations based on MR images seem to be accurate enough to be helpful in clinical decision-making.

Humans↗
PubMed1996

Local staging of prostate carcinoma with endorectal coil MRI: correlation with whole-mount radical prostatectomy specimens.

The purpose of this study was to investigate the accuracy of endorectal coil MRI in the local staging of prostate carcinoma. A total of 73 patients with biopsy-proven prostate carcinoma were examined at 0.5 T prior being submitted to radical prostatectomy. The gold standard was provided in all patients by findings at whole-mount sectioning of the surgical specimens. At pathology 28 patients had stage T2, 30 had stage T3a/b, and 15 had stage T3c lesions. Overall accuracy of endorectal coil MRI in defining local tumor stage was 82% (60 of 73 patients). Of 73 patients, 5 (7%) were underestimated and 8 (11%) overestimated. The sensitivity and the specificity of endorectal coil MRI in diagnosing capsular penetration were 95% and 82%, respectively. Seminal vesicle invasion was detected with 80% sensitivity and 93% specificity. Our data indicate that endorectal coil MRI is an accurate method for local staging of prostate cancer.

Humans↗
PubMed1995

Bacteriologic, histologic and ultrasonographic findings in strictures recurring after urethrotomy. A preliminary study.

Twelve men with recurrent anterior urethral stricture after endoscopic urethrotomy (2-12 attempts) underwent open urethroplasty with en bloc removal of diseased urethral segments. Bacteriologic and histologic studies of the excised urethral tracts (mucosa and spongiosum tissue) were performed. The bacteriologic findings were compared with the results of preoperative urine cultures and urethral swabs for chlamydia. The histologic findings were related to preoperative ultrasonographic observations, in order to evaluate the accuracy of ultrasonography in depicting structural changes in spongiosum around the strictured urethral tract. Beta-haemolytic streptococci and Streptococcus faecalis were cultured from the excised spongiosum, without correlation to the preoperative culture results. The histologic studies confirmed the usefulness of urethral ultrasonography for accurate demonstration of the inflammatory changes involving spongiosum around the strictures.

Adult↗
PubMed1992

Staging of cervical cancer: reliability of transrectal US.

One hundred twenty-four patients with invasive carcinoma of the cervix were examined with transrectal ultrasound (TRUS) before treatment. Since surgery preceded any other kind of therapy, sonographic findings could be compared with the surgical pathologic stage. The accuracy of staging with TRUS was 83%, compared with an accuracy of 78% for clinical staging performed according to the criteria of the International Federation of Gynecology and Obstetrics (FIGO). For extent of parametrial involvement, the sensitivity of TRUS evaluation was 78%, with a specificity of 89% and a diagnostic accuracy of 87%. The same reliability parameters for clinical evaluation were 52%, 92%, and 84%, respectively. From these data and from analysis of the cases--in which a discrepancy between clinical and TRUS staging was observed--it can be concluded that TRUS could be usefully applied to routine pretreatment evaluation of patients with cervical carcinoma.

Adult↗
PubMed1992

MR imaging with STIR technique and air insufflation for local staging of bladder neoplasms.

Fifty-six patients with bladder carcinoma were studied with MR imaging for the assessment of the local stage, using the inversion recovery pulse sequence with fat suppression (STIR) with air in the bladder. With this technique images of the inner and the outer parts of the bladder wall were obtained, showing high contrast between the latter and the tumor (tumor/muscle contrast 89.9%). Four tumor stages were recognized: superficial neoplasms (Tis, Ta, and T1), partial wall infiltrating neoplasms (T2); total wall infiltrating neoplasms (T3a, T3b), and neoplasms involving other pelvic organs (T4). MR imaging was compared with histopathologic diagnosis obtained at transurethral resection or cystectomy. True-positive diagnosis was obtained in 80.4%; false-positive in 14.3% of cases; false-negative in 5.3%. Despite the relatively high incidence of overstaged neoplasms, STIR technique combined with air in the bladder allowed a good accuracy in local staging.

Adult↗
PubMed1992

[The "in situ" treatment of ureteral calculi with extracorporeal lithotripsy].

The authors report on 80 cases of ureteral calculi treated with in situ extracorporeal shock wave (ESWL), with no retrograde or antegrade maneuvers. Success rate was high (97.5%). Forty-two calculi were located in the proximal ureter above the sacroiliac joint; 10 were in the pre-sacral ureter, and 28 in the pelvic ureter, below the inferior border of the sacroiliac joint. After ESWL, double-J stents were positioned in 5 patients and nephrostomy was performed in 4 cases with positioning of 7-F pig-tail catheters; 8 patients (10%) underwent additional post-lithotripsy urologic and radiologic examinations. Lithotripsy having failed in 2 patients (2.5%), surgery with ureterolithotomy was performed. In situ ESWL of ureteral calculi emerges from this trial as the treatment of choice and not as an alternative to urologic maneuvers or open surgery with ureterolithotomy: the latter methods are necessary only after ESWL failure.

Adult↗
PubMed1989

Epirubicin high-dose therapy in advanced breast cancer: preliminary clinical data. Epirubicin as a single agent in breast cancer.

Of the new anthracycline derivatives, epirubicin is the antibiotic whose antitumor activity is comparable to that of doxorubicin while its cardiotoxicity is reduced by half. We therefore incorporated into our continuing study on anthracycline antitumor effects and toxicity a group of 22 evaluable patients, mean age 52 years, with advanced breast cancer, all of whom had previously undergone chemotherapy, radiotherapy and/or hormonal therapy. Epirubicin was administered at a dose of 120 mg/M2 every 3 weeks, for a maximum of 10 such cycles. The left ventricular ejection fraction (LVEF), determined by radionuclide ventriculography, was measured periodically in all patients. We observed 2 complete responses and 13 partial responses (CP + PR = 69%) of 61 weeks' mean duration; in 3 cases lesions remained stationary while the disease progressed in 4 patients. No patients died of acute toxicity. The main side effects were severe alopecia in 82% of the subjects and moderate degrees of nausea without vomiting in 41%. After 6 treatment cycles, 4 patients showed mild cardiotoxicity and at an epirubicin cumulative dose of 1,200 mg/M2 2 patients developed congestive heart failure (CHF). Hematological toxicity was in no case so severe as to require a reduction in the dose but only a postponement of treatment by 3 to 5 days in 9% of cycles. Without increasing hematological or cardiac toxicity, epirubicin, at a dose of 120 mg/M2, has shown itself to be a highly effective agent against advanced breast cancer.

Adult↗
PubMedDate not supplied

New imaging of the anterior male urethra.

Retrograde urethrography is the method commonly employed in the detection of anterior male urethra pathology. Ultrasonography and magnetic resonance imaging have been proposed recently as new methods that can replace conventional radiography. Normal urethral anatomy can be easily studied after saline distention of the urethra, which creates high contrast relative to adjacent structures such as mucosa and corpus spongiosum. Sonourethrography with high-frequency probes has a high spatial resolution and has proved to be sensitive, specific, and accurate in the diagnosis of anterior urethral pathologies such as strictures, syringocele, tumors, and trauma. It has a major role in the selection of therapy in patients with bulbar strictures. Magnetic resonance imaging with a surface coil with a small field of view can detect penile and bulbar stenoses and tumor extension. After contrast administration, the activity of the inflammatory process in the spongiosum can be assessed and used to modify the urethroplasty technique. The clinical use of the new imaging modalities in the male anterior urethra is limited despite their demonstrated accuracy in diagnosis and presurgical staging of different diseases.

Humans↗