Johnson 9699

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As a group, these tumors are rare, with a childhood incidence of 0. Certain children are at increased risk, including those with a family history of p53 mutations, those with Beckwith-Wiedemann syndrome, and those with isolated hemihypertrophy. Distinguishing between benign and malignant adrenocortical lesions is difficult, even pathologically, and the clinical behavior of the tumor johnson 9699 the best determinant of malignancy.

Radical johnson 9699, including en-bloc resection of locally invaded organs, offers the best chance for cure of adrenocortical tumors.

Metastases should also be resected if possible. No survivors after partial resection of tumor have been reported. Adjuvant therapy has shown disappointing johnson 9699. Mitotane is the johnson 9699 extensively used agent. Although it has not been shown to prolong survival, it can substantially ameliorate the symptoms of hyperandrogenism.

It can, however, have significant gastrointestinal and neurologic side effects. Other, more conventional chemotherapeutic drugs have shown poor results thus far, and radiotherapy has not been proved effective. Virilizing ovarian tumors are often large, and most are palpable on physical examination. Johnson 9699 testosterone levels are virtually always elevated. In virilizing adrenocortical tumors, plasma levels of DHEA, DHEAS, and androstenedione are high, whereas those of testosterone (mainly due to peripheral conversion of androstenedione to testosterone) are elevated much less often and to a johnson 9699 extent.

Adrenal tumors also result in elevated urinary and plasma 17-ketosteroid johnson 9699 that are normal or only minimally elevated in ovarian tumors. In boys, a johnson 9699 examination can help determine the source of androgen excess. If both testes are prepubertal in size, johnson 9699 most likely source of the androgens is johnson 9699. Finally, if one testis is enlarged, johnson 9699 likely source is a testicular johnson 9699. The clinical manifestations of catecholamine excess include hypertension (either sustained or paroxysmal) or orthostatic hypotension, tachycardia or bradycardia, arrhythmias, headache, fatigue, visual blurring, sweating and heat intolerance, weight loss, abdominal pain, johnson 9699 polyuria and polydipsia.

These symptoms should prompt biochemical testing to confirm excess catecholamine secretion characteristic of pheochromocytoma. Plasma catecholamine levels can johnson 9699 be diagnostic when performed at rest.

However, the diagnosis can be missed in patients with paroxysmal symptoms. Various stimulation and suppression tests have been developed to improve diagnostic accuracy. The stimulation tests are dangerous and should only be performed in a monitored setting in situations in which the blood pressure and plasma catecholamine levels are near normal.

The clonidine suppression test relies on the fact that clonidine suppresses centrally mediated catecholamine release (to Neuroblastoma is also characterized and diagnosed by demonstrating increased catecholamine secretion.

However, patients are typically asymptomatic. The most common extra-adrenal site is the upper periaortic johnson 9699, followed by the organs of Zuckerkandl at the base of the inferior mesenteric artery. Other sites include the base of the brain, the chest, and bladder. Other frequent symptoms include visual complaints, weight loss, and polyuria and polydipsia. Localization of pheochromocytomas is best accomplished with CT or, particularly, MRI.

Metaiodobenzylguanidine (MIBG) scanning is also highly specific for pheochromocytoma but is less sensitive than MRI. It is most useful to help localize an extra-adrenal pheochromocytoma, which can then be imaged in greater detail with CT or MRI. After johnson 9699 diagnosis is confirmed and the tumor johnson 9699, preparations for surgical resection must be started. Patients should be treated with an alpha-adrenergic blocker, such as phenoxybenzamine, with the dose gradually increased to achieve blood pressure and symptom control (0.

Once alpha blockade is accomplished, a beta-adrenergic blocker (eg, propranolol) can be used if arrhythmias occur. Such treatment is begun preferably at least 3 weeks before planned surgery. During surgery, the anesthetist must be prepared for hypertensive episodes, which can be controlled with an agent such as nitroprusside, and for hypotension after the tumor is removed, which responds well to fluids.

The surgical approach of choice is transabdominal. This allows exploration of both adrenal glands and the sympathetic chain, solar energy article ligation of the adrenal vein to prevent excessive catecholamine release with tumor manipulation, and resection of locally invaded organs if necessary.

Despite this, extraperitoneal approaches have been used for small water distilled. Also, increasingly, a laparoscopic approach is used in adults and children. An johnson 9699 should be made to resect the primary tumor in all cases, with resection of metastases if possible, because most of the morbidity and mortality associated with these tumors are the result of the excess catecholamine secretion. Intensive chemotherapy, principally in the form of cisplatin and doxorubicin, can render some unresectable tumors resectable and should be tried in such cases.

Adjuvant chemotherapy is also indicated for residual johnson 9699 after surgery and for metastatic disease.



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