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Biomedical subjects

D J van Velden

Publications and source records attributed to D J van Velden.

10 recordsLinked to original sources
PubMed1997

Carcinoma of the penis--appraisal of a modified tumour-staging system.

OBJECTIVE: To evaluate variables for the prediction of lymph node metastases in carcinoma of the penis, using a recently proposed modified tumour-staging system that combines the histological degree of differentiation and extent of local invasion of the primary tumour. PATIENTS AND METHODS: Thirty-five patients with squamous carcinoma of the penis and histo- or cytological staging of the inguinal lymph nodes were reviewed. A clinical TNM staging system was used in which the size (diameter) of the primary tumour and the clinical extent of invasion were considered. Subsequently, the tumours were also staged according to a modified T-system in which the histological degree of differentiation and pathological extent of tumour invasion were combined. RESULTS: Penectomy was performed in 34 patients (partial amputation in 20 and radical penectomy in 17). Inguinal lymphadenectomy was performed in 31 patients and in four the presence of lymph node metastases was confirmed by aspiration cytology. Using the clinical TNM staging system, lymph node metastases were histo- or cytologically present in no patients with T1, in five of 19 with T2, in 10 of 13 with T3 and in both patients with T4 tumours. Lymph node metastases were present in two of eight patients without clinically palpable inguinal nodes, in three of 14 with nodes clinically thought to be infective and in 11 of 12 nodes clinically considered to be malignant. Lymph node metastases were present in five of 17 patients with grade 1, in nine of 13 with grade 2 and in three of five with grade 3 tumours. Using the modified histological T-staging system (T1 = grade 1-2, invasive through dermis; T2 = any grade, invasion of corpus spongiosum or cavernosum; T3 = any grade, invasion of urethra; T4 = grade 3, regardless of invasion) lymph node metastases were present in one of nine patients with T1, in eight of 16 with T2, in all five with T3 and in three of five with T4 tumours. CONCLUSION: The modified T-staging system, which combines histological differentiation with pathological extent of invasion, provided the best predictive distinction between T1 and T2-4 tumours, indicating that lymphadenectomy can be avoided in T1 tumours, but should be performed in all patients with T2-4 tumours. We recommend bilateral inguinal lymphadenectomy 6-8 weeks after penectomy in such patients.

Adult↗
PubMed1991

Pelvic lipomatosis associated with cystitis glandularis and adenocarcinoma of the bladder.

Pelvic lipomatosis is a rare condition characterized by an overgrowth of normal fat in the perivesical and perirectal spaces. Cystitis glandularis, cystica or follicularis has been observed in 75% of the patients with pelvic lipomatosis. Although cystitis glandularis is widely regarded as premalignant few reports have documented its transition to adenocarcinoma. We describe a 41-year-old man with pelvic lipomatosis in whom primary adenocarcinoma of the bladder developed 6 years after a histological diagnosis of cystitis cystica and glandularis was established. To our knowledge this is the second case reported of pelvic lipomatosis associated with proliferative cystitis and adenocarcinoma of the bladder, indicating that intestinal metaplasia of the urothelium may be a precursor of malignancy in these patients.

Adenocarcinoma↗
PubMed1984

Drugs in sport. A report of laboratory investigations into the prevalence of their use in South Africa.

Screening procedures utilizing two-dimensional thin-layer chromatography, gas-liquid chromatography and gas chromatography-mass spectrometry were carried out in an attempt to detect stimulant drugs in urine specimens collected from competitors in three major sporting events held during 1983. Drugs classified as forbidden stimulants by the International Olympics Committee were detected in 4% of the specimens collected from competitors in the South African Athletics Championships and in 28% of the specimens collected from competitors in the 1983 Rapport Cycling Tour, while none were detected in specimens collected from competitors in the South African Senior Swimming Championships.

Bicycling↗
PubMed1979

Postmenopausal endometriosis: A case report.

A case of postmenopausal endometriosis is presented. Symptoms started 14 years after total abdominal hysterectomy and bilateral salpingo-oöphorectomy for endometriosis following oestrogen administration. The disease had a protracted course and eventually responded well to radiotherapy. Certain aspects of postmenopausal endometriosis are discussed.

Endometriosis↗
PubMed1979

Incidence of ovarian neoplasms at the Bloemfontein Academic Hospitals, 1972-1977.

In the Orange Free State patients with gynaecological tumours are mainly referred to the National and Pelonomi Hospitals and the Department of Oncotherapy. During the 6 years 1972-1977 there were 1 895 admissions to the gynaecological wards of the National Hospital and 9 807 admissions to those of the Pelonomi Hospital. A total of 205 cases of primary ovarian neoplasia was seen, comprising 97 Whites and 108 Blacks. These cases were further divided into benign and malignant tumours and histologically classified into four main groups. Comparisons were made between cases seen in Bloemfontein and cases at other institutions.

Female↗
PubMed1978

[Malignant hyperthermia in a black child. A case report].

A case of malignant hyperthermia in a Black boy is presented. He developed this condition during repair of a cleft palate, with halothane as the triggering agent. The importance of the high incidence of malignant hyperthermia in patients with certain musculoskeletal abnormalities is stressed. Despite a cool and well air-conditioned theatre, the patient's temperature was 41 degree C when the condition was suspected. At that stage general muscle rigidity was present. The patient was successfully treated with procainamide, sodium bicarbonate and hydrocortisone; surface cooling (with ice packs) was instituted and the stomach was washed out with ice-cold Ringer's solution. Over a period of 14 days serum creatine phosphokinase values decreased from 630 IU (on the day of the incident) to 12 IU. A muscle biopsy showed variation in muscle fibre size. Electron microscopical studies showed myofibrillar disruption and folding of the basement membrane. A modified version of Denborough's technique was used for the in vitro exposure of muscle strips to halothane and suxamethonium. Isometric contraction was measured and recorded. A severe contraction followed the exposure of muscle strips to halothane, which confirmed the diagnosis.

Child↗
PubMedDate not supplied

Fetal bilateral obstructive uropathy: a series of nine cases.

Bilateral obstructive uropathy is increasingly diagnosed in early pregnancy by ultrasound examination. Termination of pregnancy presented an opportunity to study uropathy in nine cases between 18 and 24 weeks of gestation. En bloc dissection of the urinary tract and subserial sectioning of the urethra revealed obstruction at the level of the membraneous urethra in all cases. No structural obstruction could be demonstrated in three cases, and urethral valves caused partial obstruction in two cases. The urethra was distorted by a fibrous band in one case. In three cases overriding urethral lumens appeared to represent incomplete or faulty canalization at the angled junction of the developing posterior and anterior urethra. Urethral obstruction is considered the major etiologic factor in the development of bilateral fetal uropathy and presumably the prune-belly phenotype.

Fetal Diseases↗