Value of (99m)Tc tetrofosmin scan in well-differentiated thyroid cancer.

Background: Patients with cold thyroid nodules without ultrasound malignant suspicion and with benign/undetermined cytology may be subjected to follow-up surveillance. 99mTc-tetrofosmin scan (99mTc-TS) may identify patients where this observation can be performed with more certainty. Absence of uptake never occurs in carcinoma patients.

[Unsual clinical signs of primary hyperparathroidism].

Background: A growing number of patients with primary hyperparathyroidism (PHPT) are diagnosed in the absence of symptoms following routine biochemical screening. However, in some countries, overt manifestations and osteitis fibrosa cystica (OFC) still dominate the clinical profile of PHPT patients.

Methods: We retrospectively studied clinical and biochemical manifestations of 47 consecutive patients with primary hyperparathyroidism who were treated with parathyroidectomy from October 1993 to June 2005.

Evolution of maxillofacial brown tumors after parathyroidectomy in primary hyperparathyroidism.

Background: Brown tumor occasionally affects the facial bones. Clinically, these lesions can be mistaken for a neoplasm. Opinions are divided on the course of management of the bony lesions once parathyroidectomy has been carried out.

[Multiple maxillofacial brown tumors as primary hyperparathyroidism manifestation].

Objective: In order to analyze the differential diagnosis of giant-cell lesion in facial bones, we present a case of a patient without a previously diagnosed primary hyperparathyroidism that displayed multiple maxillofacial brown tumors as the initial clinical manifestation of the disease.

Case Description: A 70 year-old female with amandible tumor and one year of disease progression. Tumor biopsy confirmed the presence of a giant-cell lesion.

[Prognostic factors in head and neck mucoepidermoid carcinoma].

Background: In patients with mucoepidermoid carcinoma (MEC) originating in salivary glands, because of the relative rarity of these tumors and the remarkable variability in their biological behavior, opinions differ about appropriate classification, grading, and treatment.

Objective: We undertook this study to analyze clinical and histological prognostic factors in a series of patients with MEC using univariate and multivariate survival analyses.

Methods: We reviewed 47 patients with MEC treated at our institution from 1985 to 2000.

[Primary melanoma of the oral mucosa. Experience of the Oncology Hospital of Centro Médico Nacional Siglo XXI].

Background: Primary intraoral melanoma is extremely rare and carries a poor prognosis. Treatment of choice remains controversial. Our aim was to define the clinical features of this disease and to evaluate treatment methods.

[Lymphatic mapping and sentinel lymph node biopsy in patients with high risk squamous cell carcinoma of the skin].

Background: Some sub-groups of cutaneous squamous cell carcinoma (CSCC) display a higher risk for regional metastasis. Sentinel lymph node staging has been used successfully to evaluate nodal metastasis in selective tumors.

Objective: Assess the feasibility of sentinel node to detect occult regional lymph node metastasis in high-risk CSCC.

[Post total laryngectomy stomal recurrence. Case report and review of the literature].

Development of stomal recurrence following total laryngectomy is a devastating scenario with an extremely poor prognosis. Overall rate of stomal recurrence ranges from 1.7%-40%, with an average rate of 7.