Embryo recovery rate and recipients' pregnancy rate after nonsurgical embryo transfer in donkeys.

Sixty-three embryos were recovered out of 83 estrous cycles (75.9%) and 98 ovulations (64.3%) of five Pantesca jennies, 2 to 5 yr old, naturally mated or artificially inseminated with fresh semen. Embryo recovery rate was influenced by number of ovulations per cycle (133% and 63% for double and single ovulations, respectively), by the day of embryo recovery attempt (12%, 83%, and 75% at Days 7, 8, and 9 after ovulation, respectively), and by the repetition of the embryo recovery attempt on successive cycles (60%, 79%, and 100% for cycles 1 to 7, 8 to 14, and 15 to 24, respectively). All recovered embryos but three were classified as good or excellent. Of 58 nonsurgical embryo transfers to Ragusana jenny recipients, 13 (22.4%), 10 (17.2%), and 9 (15.5%) resulted in a pregnancy at Days 14, 25, and 50, respectively. Recipients' pregnancy rate was not influenced by the evaluated parameters: embryo quality and age, media employed to wash embryos, days after ovulation of the recipient, experience of the operator. Between 14 and 50 d of pregnancy, 4 of 13 (30.7%) embryos were lost with an influence of the days from ovulation of the recipient: recipients at Days 5 or 6 kept all pregnancies (N=7), whereas recipients at Days 7 or 8 lost 3 of 4 pregnancies, as one of the two recipients at Day 3. More studies are needed before embryo transfer could be considered a reliable tool to preserve endangered donkey breeds.

Aggressive fibromatosis of the neck initiated after thyroidectomy.

We describe the case of a 44-yr-old woman, who 2 yr after thyroidectomy for a multinodular goiter with a follicular adenoma showed a rapidly growing mass of the neck causing dysphagia and moderate pain. Fine needle aspiration biopsy revealed the presence of fibroblast-like cells, partially with atypical features and no colloid: the cytological diagnosis was suspicious for an indeterminate (mesenchymal) neoplasm. Histological diagnosis, after extensive surgery, indicated aggressive fibromatosis. Immunohistochemistry was positive for vimentin and negative for thyroglobulin. After surgery, nuclear magnetic resonance showed a persistent mass of approximately 2 cm; dysphagia and pain persisted. Therefore, the patient received external radiation therapy (total dose 60 Gy) with clinical benefit. The patient is without symptoms 1 yr after surgery.

Long-term outcome of medullary thyroid carcinoma in patients with normal postoperative medical imaging.

Imaging-detected relapses are observed in a significant proportion of patients with medullary thyroid carcinoma (MTC) with normal postoperative imaging studies. The aim of this study was to search for prognostic factors of imaging-detected relapse. This retrospective study was performed in 63 consecutive MTC patients with normal postoperative medical imaging. After surgery, the basal calcitonin (CT) level was undetectable in 35 patients and elevated in 28. During follow-up, 18 patients developed a clinical or imaging-detected relapse (29%) in the neck and/or at distant sites: 15 had an elevated postoperative basal CT level and three had an undetectable postoperative basal CT level. At multivariate analysis, the significant parameters predictive of imaging-detected relapse were the postoperative plasma CT level and the tumour extension (pT). The 3- and 5-year relapse-free survival rates were 94 and 90% in patients with an undetectable postoperative basal CT level, and 78 and 61% in patients with a detectable basal CT level (P<0.05). The 3- and 5-year relapse-free survival rates were 92 and 85% in the pT1-3 patients, and 57 and 46% in the pT4 patients (P<0.01). These results show that postoperative CT level and tumour extension are critical prognostic factors for the identification of patients at a high risk of relapse.

Differentiated thyroid cancer in children and adolescents.

In this retrospective study we analyzed cancer characteristics and outcome in a consecutive series of 48 young patients (< or =20 yr of age) with a differentiated thyroid cancer (DTC), observed during the period 1977-1998. In none of them was thyroid cancer related to ionizing radiation. The median age was 18.1 yr, range 7-20, and the female/male ratio was 2.5/1. Papillary thyroid cancer (PTC) occurred in 83% and follicular thyroid cancer (FTC) in 17% of cases. All patients underwent total or near total thyroidectomy plus pre- and/or paratracheal lymphnode dissection. Surgery complication rate was low (4% permanent hypoparathyroidism; no permanent lesion of recurrent laryngeal nerve). Extrathyroid disease was present in 52% of patients with PTC and in 50% of patients with FTC, while nodal metastases were present in 62.5% of patients with PTC and in 12.5% of patients with FTC. Lung metastases occurred in 10 patients with PTC (25%) and in none with FTC. Twenty-one patients required radioiodine treatment for metastatic disease: 11 patients for relapsing lymph-node metastases, 4 patients for lung metastases, 6 patients for both lymph-node and lung metastases. After a mean follow-up of 85+/-12 months all patients followed regularly (no.=47) were alive; 37 patients (79%) were free of disease and 10 (21%) had residual disease. Our results indicate that non-radiation-related DTC occurring in young patients often presents at an advanced stage. For this reason, although the prognosis is usually good in these patients, we believe that total or near total thyroidectomy with lymphadenectomy is always the required initial surgical treatment.

Usefulness of recombinant human thyrotropin in the radiometabolic treatment of selected patients with thyroid cancer.

Treatment of persistent/recurrent differentiated thyroid cancer is based on surgery, when feasible, and malignant tissue ablation by 131I administration. This procedure requires levothyroxine withdrawal to obtain high levels of endogenous thyrotropin (TSH) to stimulate radioactive iodine uptake by the malignant tissue. Levothyroxine withdrawal may cause severe adverse effects and complications in patients with concomitant illness or advanced metastatic disease. The recent availability of recombinant human thyrotropin (rhTSH) allows diagnostic whole-body scan (WBS) and thyroglobulin testing without levothyroxine withdrawal. We describe six patients with metastatic differentiated thyroid cancer (DTC) and concomitant illness in whom the use of rhTSH was effective in preventing the complications that patients had previously experienced during hypothyroidism consequent to levothyroxine withdrawal. Our results indicate that rhTSH can be particularly advantageous to avoid signs and symptoms of hypothyroidism and complications because of associated diseases in view of 131I treatment of DTC metastases in selected cases in which levothyroxine withdrawal may be dangerous. Its efficacy to treat advanced metastatic disease should be further investigated.

[Differentiated carcinoma of the thyroid in the young. Clinical and histopathologic aspects]. / Carcinoma differenziato della tiroide in età giovanile. Aspetti clinici ed istopatologici.

BACKGROUND: The surgical approach to Differentiated Thyroid Carcinoma (DTC) is controversial. Aim of this study is to evaluate the opportunity of total thyroidectomy as treatment of choice for DTC in children. METHODS: We examined the tumor features at diagnosis, the complications of surgery and the clinical outcome in a consecutive series of 33 young patients, (age range 7-19 yrs), who underwent total thyroidectomy for DTC as compared to a consecutive series of 181 adult patients operated for DTC (age range 20-64 yrs). RESULTS: Histopathological examination has shown that bilateral foci of the tumor and extrathyroidal extension, were present with similar frequency in both groups of patients (15 vs 18% and 39 vs 48% respectively); node metastases and distant metastases were more frequent in young patients than in adult patients. Complications of total thyroidectomy were not frequent with 6% of permanent hypoparathyroidism. No case of laryngeal nerve damage was observed. In 7/8 patients with lung metastases the radioiodine treatment was effective: in four patients we observed a complete remission of disease, and in three patients a partial response with a decrease of Tg levels and a reduction of the radioiodine uptake areas. CONCLUSIONS: Thyroid carcinoma is not less aggressive in children than in adults. Total thyroidectomy plus lymph node dissections appears to be the treatment of choice as routine surgical treatment of DTC in children. Radioiodine therapy gives good results for the treatment of lung metastases.

Appearance of anti TSH-receptor antibodies and clinical Graves' disease after radioiodine therapy for hyperfunctioning thyroid adenoma.

Radioiodine treatment use is frequent in patients with benign hyperfunctioning thyroid diseases and the side-effects are rare. In this paper we described the appearance of TSH-receptor antibodies and the concomitant development of persistent hyperthyroidism in a patient with hyperfunctioning thyroid adenoma after 131I treatment. A 70-year-old man presented a hyperfunctioning thyroid adenoma with suppressed uptake in the adjacent normal gland. Antibodies against the thyroglobulin (TgAb), thyroid peroxidase (TPOAb) and TSH-receptor (TRAb) were absent. One year after remission by radioiodine therapy the patient developed severe and persistent hyperthyroidism associated with diffuse 131I uptake in the gland. TgAb and TPOAb remained absent, but TRAb were present. Although spontaneous development of Graves' disease cannot be excluded, the time sequence and the negative familial and personal history for autoimmune diseases suggest a possible connection between the two phenomena. The release of TSH-receptor antigen from follicular cells damaged by 131I may have triggered the autoimmune response turning a toxic nodular goiter patient into a Graves' disease patient.