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Dive into the research topics where Walter M. O'Brien is active.

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Featured researches published by Walter M. O'Brien.


Urology | 1987

Adrenal metastases by renal cell carcinoma: Incidence at nephrectomy

Walter M. O'Brien; John H. Lynch

Recently, there have been questions raised as to the results and feasibility of performing renal-sparing procedures for localized renal cell carcinoma. We reviewed the records of 72 patients treated with standard radical nephrectomy to determine the incidence of adrenal involvement and to determine if adrenal lesions were detectable by radiographic methods preoperatively. Four patients had evidence of adrenal involvement for an overall incidence of 5.5 per cent. All had upper pole lesions. Adrenal involvement in each case was apparent at surgery or on preoperative imaging studies. For patients with middle and lower pole localized renal cell carcinoma who have normal findings on preoperative computerized tomography scans, modified radical nephrectomy sparing the adrenal gland may be a surgical alternative to radical nephrectomy.


Annals of Emergency Medicine | 1989

Priapism: Current concepts

Walter M. O'Brien; Kevin P. O'Connor; John H. Lynch

The treatment options for the management of the patient with priapism have changed markedly within the past several years. When possible, the underlying cause of the priapism should be identified. Therapy should be guided by the results of aspiration of the blood-filled corpora cavernosa of the erect penis. Early intervention through pharmacologic manipulation or surgical shunting should not be delayed while trying conservative measures.


Urology | 1990

Percutaneous nephrostomy in infants.

Walter M. O'Brien; Alan H. Matsumoto; Edward G. Grant; M. David Gibbons

We reviewed our experience with percutaneous nephrostomy placement in children less than one year of age during a five-year period. Placement was successful in 8 of 9 cases. There were no complications. The procedure favorably altered the outcome for each patient and was useful for reversing azotemia prior to surgical intervention for repair of an obstructed system (2 renal units), for providing drainage of pyonephrotic kidneys (3 renal units), for demonstrating inadequate recovery of renal function after relief of obstruction (2 renal units), and for replacing a surgically placed nephrostomy that was dislodged (1 renal unit). Our experience has encouraged us to accept the technique, and we believe that it is a valuable nonsurgical alternative that should be available to urologists managing infants with urinary tract pathology.


Urology | 1993

Acute scrotal swelling in henochschonlein syndrome: Evaluation with testicular scanning

Walter M. O'Brien; Kevin P. O'Connor; John J. Horan; Douglas E. Eggli; M. David Gibbons

Acute scrotal swelling may accompany Henoch-Schonlein syndrome and may be the presenting manifestation mimicking testicular torsion. Two patients with scrotal involvement were recently evaluated with nuclear imaging to assess testicular perfusion. One patient had normal perfusion, and the other had increased perfusion. Scan results allowed expectant management and avoided the need for exploratory surgery to rule out testicular torsion.


Diseases of The Colon & Rectum | 1988

Epididymitis—An unusual presentation of colovesical fistula secondary to diverticulitis

Walter M. O'Brien; John H. Lynch

A case of colovesical fistula secondary to diverticulitis that had the unusual presentation of epididymitis is presented. The current literature on diverticulitis involving the urinary tract is reviewed.


Urology | 1989

Neurogenic fibrosarcoma following radiation therapy for seminoma

Walter M. O'Brien; Susan L. Abbondanzo; Byungkyu Chun; Herbert J. Manz; William C. Maxted

We report a case of radiation-induced neurogenic fibrosarcoma that developed in a patient who received radiation therapy for seminoma. The sarcoma developed within the irradiated field after a latency period of nineteen years. Although the occurrence of a secondary neoplasm is unusual, this possibility should be included in the differential diagnosis of patients who present with tumor growth after a long interval following radiation therapy.


Urology | 1990

Simplification of double-dye test to diagnosevarious types of vaginal fistulas

Walter M. O'Brien; John H. Lynch


Urology | 1988

Percutaneous placement of suprapubic tube using peel-away sheath introducer

Walter M. O'Brien; John J. Pahira


Diseases of The Colon & Rectum | 1988

Epididymitis: an unusual presentation of colovesical fistula secondary to diverticulitis: report of a case

Walter M. O'Brien; John H. Lynch


Journal of Endourology | 1990

Repeated Percutaneous Nephrolithotomy in Patient with Recurrent Cystine Lithiasis: Preservation of Renal Function

John J. Horan; Walter M. O'Brien; John J. Pahira

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John J. Pahira

University of Pennsylvania

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