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Biomedical subjects

A Gamoudi

Publications and source records attributed to A Gamoudi.

14 recordsLinked to original sources
PubMed1996

[Primary leiomyosarcoma of the small intestine in a child].

BACKGROUND: Leiomyosarcomas of the digestive tract are very rare in children. They must be differentiated from benign tumors (leiomyoma, schwannoma...) and from other malignant tumors, sometimes with the aid of immuno-histochemical study. CASE REPORT: A five-year old girl suffered from an abdominal mass associated with fever and alteration of the general condition. An ileal tumor, 8 cm in diameter, was resected. Histological and immunohistochemical studies (anti-vimentin antibodies, anti-actin antibodies and PS100) confirmed the diagnosis of leiomyosarcoma. Uncomplete adjuvant chemotherapy failed to prevent relapse of the tumor. CONCLUSION: This case confirms the bad prognosis of such a tumor.

Child, Preschool↗
PubMed1995

Melanin production in medullary thyroid carcinoma.

A case of melanin-producing medullary thyroid carcinoma is reported in a 51-year-old man. Histologically, the tumour had a typical pattern of medullary thyroid carcinoma with numerous scattered pigmented cells which contained large amounts of melanin pigment as confirmed by bleached Fontana-Masson stain. Immunohistochemical staining revealed positivity of almost all tumour cells for calcitonin and chromogranin, whereas S-100 protein and HMB-45 staining was positive only in the pigmented tumour cells. This finding confirms the ability of medullary thyroid carcinoma cells to have multidirectional differentiation, although melanocytic differentiation remains an exceptional phenomenon.

Amyloid↗
PubMed1995

[Breast myoepithelioma. Report of a case].

Myoepithelial cell tumors of the breast are rare. They present diagnostic difficulties not only on frozen sections but also after fixation and paraffin embedding. These tumors can give rise to a wide range of clinical evolution... Treatment vary from simple excision for myoepitheliosis to mastectomy with axillary node dissection for malignant myoepitheliomas. Large excision is necessary for adenomyoepitheliomas because of the risk of recurrence and, more uncommonly, their proclivity to metastasis. We report the case of breast myoepithelioma in a 42 years old woman. The tumor was clinically, radiologically and macroscopically well demarcated. Histologically the tumor was composed of myoepithelial cells with few cellular atypias and a low mitotic activity. Tumor cells expressed vimentin, actin, S100 protein and cytokeratin. This particular immunohistochemical phenotype allows the differential diagnosis with other breast tumors.

Adult↗
PubMed1995

[Ovarian hydatic cyst. 7 cases].

Seven cases with echinococcal infection of the ovary, including 3 on both sides, were collected at the Salah Azaiz Institute of Tunis during a period of 23 years. This localisation is rare, even in an endemic country. The aetiology and pathogenesis of this affection may give rise to many different clinical signs, problems with pre-operative diagnosis. It is important to follow up these cases after operation in order to sport recurrences. The objective of surgical treatment is to achieve cure of both the hydatic cyst of the ovary and the primitive cyst simultaneously. Following this treatment, two difficulties may arise: the first one is preoperative rupture of the cyst; the second concerns fertility in these young women after two-sided salpingo-oophorectomy. Finally, when a pelvic cyst is observed systematic hydatic serology must be performed.

Adult↗
PubMed1995

[Breast angiosarcoma. Five case reports].

The authors report 5 cases of breast angiosarcoma collected in the Salah Azaiz Institute of Tunis, the only oncology center in this country, between 1969 and 1990. They enumerated 4,000 malignant breast tumors during this period; i.e. an incidence of 1.25%, higher than that in the world literature (0.4%). The mean age of patients was 44. Three were post-menopausal, and two were of childbearing age, one of whom was pregnant. This rare tumor is virtually limited to women. Affection is scarce, it affect's almost exclusively women. It generally present as a painless, ill-defined mass, without regional lymphadenopathy. The diagnosis of angiosarcoma is difficult since the histologic appearance is sometimes identical to that of a hemangioma. Hence the value of very thorough histologic examination of the entire operative specimen. Treatment is based upon mastectomy. The usefulness of adjuvant chemotherapy and/or radiotherapy is uncertain. The prognosis remains gloomy despite early diagnosis and treatment. The authors attempt in this study to identify the various features of this serious and uncommon condition, based upon the rare published cases in the world literature.

Adult↗
PubMed1995

[Struma ovarii. Three malignant cases and one benign case].

Four cases of struma ovarii were seen among 308 ovarian tumors removed surgically at the Salah Azaiz Institute, Tunis, Tunisia, between 1980 and 1989. This yields an occurrence rate of 1.3%, which is comparable to previously publishes rates (0.3% to 2%). One of the four tumors was malignant. Malignant transformation of struma ovarii is very rare (5% to 10%). The histologic diagnosis of malignancy is difficult, particularly in well-differentiated follicular forms. The prognosis is relatively favorable even in patients with metastases. Based on their personal experience and on a review of the literature, the authors discuss the diagnosis, management, and outcome of struma ovarii, in particular with malignant transformation.

Adult↗
PubMed1994

[Synovial sarcoma. Anatomoclinical aspects apropos of 8 cases].

Synovialosarcoma is a rare tumor, of difficult diagnosis. Authors report 8 cases diagnosed in the two pathology departments of Salah Azaïz Institute and the Universitary Hospital of Sfax, from 1985 to 1991. This tumor represents 2.96% of all soft tissues sarcomas treated in Salah Azaïz Institute. It occurs in young adults (the average age in our series: 28.8 years) with a male predominance (6 out of 8 cases), localized preferentially in the lower extremity. In the histological study, immunohistochemistry provides a great contribution in the diagnosis and classification of these tumors. The histoprognosis grading of Trojani applied to our cases shows the good correlation between the grade and the prognosis. Treatment is primarily surgical, consisting in wide excision to avoid recurrences that are unfortunately very frequent. Radiotherapy and chemotherapy give very inconstant results. Some authors recommend radiotherapy to sterilize the tumor field, and chemotherapy to prevent metastasis. The clinical course is characterized by a high frequency of local recurrences and pulmonary metastases.

Adolescent↗
PubMed1991

[Malt digestive system lymphomas and alpha heavy chain diseases. Histological and immunohistochemical study. Apropos of 3 cases].

Malt lymphomas are lymphomas developed from mucosa associated lymphoid tissue and may involve many sites such as the gastrointestinal tract, salivary glands, thyroid gland lung, breast and female genital tract. Histologically, their diagnosis is based upon the existence of four elements: centrocyte-like cells that are responsible for lymphoepithelial lesions that are sometimes very difficult to demonstrate reactive or residual follicles and plasma cells. We study 2 cases of gastric Malt lymphoma and one of alpha heavy chain disease involving the small intestine and the stomach and we try to define the common features of Malt lymphoma, alpha chain disease and non-secretary IPSID, which all present the clinical tetralogy mentioned above.

Adult↗
PubMed1987

Immunolocalization of angiotensin 1 converting enzyme in the human male genital tract by the avidin-biotin-complex method.

Immunoreactivity for Angiotensin 1 Converting Enzyme was investigated in a series of 12 fixed and paraffin-embedded normal human genital tract specimens. The Avidin-Biotin-Complex immunoperoxidase method was used with overnight (12 h) incubation with a polyclonal antihuman kidney Angiotensin 1 Converting Enzyme antiserum. All tissues, including testis, different parts of epididymis, ductus deferens, prostate and seminal vesicles, demonstrated a staining pattern. Immunoreactivity was observed on the luminal surface of these epithelia especially on non-motile stereocilia. An intracellular positivity was only observed in spermatids on the acrosomal cap. Besides, an immunologic identity of Angiotensin 1 Converting Enzyme located on the different epithelia of the human male genital tract, on the endothelial cells of vessels and on the proximal tubule brush border of the kidney was observed.

Avidin↗
PubMed1987

[Ultrasonic pseudotumoral aspect of cirrhosis].

Seven cases of cirrhosis with non-tumoral nodules on ultrasound imaging are reviewed. Comparison of ultrasound and histopathologic data provided information on mode of formation and pathologic significance of these images. They correspond usually to a particular distribution of fibrosis and steatosis, exceptionally to regenerating nodules. Nodule formations seen on ultrasound images are independent of histopathologic criteria defining micro- and macro-nodular cirrhosis. Ultrasound guided cytohistology is the only examination allowing their distinction from true tumoral lesions.

Diagnosis, Differential↗