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Biomedical subjects

M Patrón Romero

Publications and source records attributed to M Patrón Romero.

7 recordsLinked to original sources
PubMed2005

[Thoracic kaposiform hemangioendothelioma. Four consecutive cases with distinct outcome].

INTRODUCTION: Kaposiform hemangioendothelioma (KHE) is a rare, frequently congenital, neoplasm associated with the Kasabach-Merritt phenomenon (KMP) and predilection for the trunk. Its clinical course is unpredictable. A child with KHE can die as a result of hemorrhage or show early spontaneous regression. In addition various and concurrent therapies can be used to treat this tumor and it is difficult to predict which treatment will be successful. MATERIAL, METHODS AND RESULTS: We present four consecutive cases of KHE (larger than 20 cm) of the thorax. All patients developed KMP, without skin involvement in one patient. Patient 1, a neonate with KHE occupying both hemithoraces (nearly 50% of the body surface area), died shortly after birth due to coagulopathy and generalized bleeding. Patient 2, a neonate, was treated with interferon alpha-2a and showed accelerated correction of coagulopathy and complete tumoral regression at 9 months. Patient 3 showed no response to steroids, interferon or vincristine therapy. Thrombocytopenia (platelet count 40,000) persisted for 8 years and was resolved by administration of aspirin plus ticlopidine, without tumoral disappearance. Patient 4 underwent incomplete removal of the tumor on her right chest wall after showing no response to antiangiogenic therapy. The coagulopathy persisted and a second radical surgical procedure resolved KMP. CONCLUSION: Given the variable response to pharmacological treatment and the scant possibilities of surgical resection, the management of KHE with KMP must include a multidisciplinary approach. As little is known about the pathogenesis of these highly aggressive vascular tumors, further molecular research is needed to understand their long-term behavior.

Antineoplastic Agents↗
PubMed2002

[Lymphoproliferative disorders of Waldeyer's ring].

OBJECTIVE: To investigate the incidence and characteristics of lymphoproliferative disorders of Waldeyer's ring in our pediatric patients. MATERIAL AND METHODS: We retrospectively reviewed 20 children under 14 years of age who underwent surgery in our department for adenoidectomy and/or tonsillectomy between 1 January 1996 and 30 November 2000. In non-immunocompromised children, surgical indication was the recent development of progressive unilateral tonsillar hyperplasia, and in immunocompromised patients indication was mainly the enlargement of adenoids and/or tonsils, although eradication of local Ebstein-Barr virus infection and recurrent acute tonsillitis were also indications. RESULTS: The mean age was 4.6+/-2.3 years (range: 16.9 months-13.9 years). Sixteen patients (80.0 %) were male. In the nine patients with unilateral hyperplasia, histopathological diagnosis was diffuse lymphoid hyperplasia. Of the 11 immunocompromised patients, 5 (45.5 %) had some type of lymphoproliferative disorder. DISCUSSION AND CONCLUSIONS: Lymphoproliferative disorders of Waldeyer's ring are relatively frequent in immunocompromised children who have undergone surgery of the adenoids and/or tonsils. Although no cases of unilateral hyperplasia of the tonsils were diagnosed in our series, tonsillectomy is indicated in patients with this diagnosis, independent of their immunological status.

Adolescent↗
PubMed1993

[New histopathologic data of prognostic value in extra-adrenal paragangliomas. Study of 9 cases].

BACKGROUND: The biological behavior of paragangliomas is difficult to evaluate by classic histological criteria thus justifying the use of immunohistochemical markers as prognostic factors. METHODS: Nine extra-adrenal paragangliomas (three jugulo-tympanic, four carotid-body tumors, and two retroperitoneal) were studied by conventional histological criteria, and also by chromogranin A and neuron-specific enolase (NSE) immunohistochemical staining for the study of chief cells, and S-100 as a marker of sustentacular cells. The rate of cell proliferation was studied by the proliferating cell nuclear antigen (PCNA). The correlation between these parameters and the clinical evolution of the neoplasms, which were classified as benign, locally aggressive, and malignant (with metastasis), were also analyzed. RESULTS: The atypia and the mitotic rate did not correlate with the behavior of the tumor. Less immunostaining with the anti-S-100 and anti-chromogranin A antibodies was observed in the malignant paragangliomas and in those which were locally aggressive. In the benign tumors the proliferative rate (PCNA) oscillated between 0.7% and 3.7%, and 40 or less PCNA positive cells were counted in 10 high-power field (HPF) (40x). In malignant and locally aggressive tumors the proliferative rate was 5% or more, with 60 or more cells that were positive for PCNA being found in 10 HPF. CONCLUSIONS: The histopathologic signs implying worse prognosis in extra-adrenal paragangliomas are a decrease in chromogranin A and S-100 immunoreactivity and a rate of cell proliferation of 5% or greater, or a number of cells stained for proliferating cell nuclear antigen greater than 50 in 10 high-power field.

Adult↗
PubMed1993

Salivary duct carcinoma: a report of nine cases.

Nine cases of salivary duct carcinoma are presented. Eight lesions were located in the parotid gland and one in the submandibular gland. Tumor size was greater than 3 cm in four cases (44%), and facial paralysis was observed in five tumors (62.5%). Lymph node metastases were observed macroscopically or microscopically in seven patients. Perineural and lymphatic invasion were detected in eight and seven cases, respectively. Free surgical margins were obtained in eight of the nine patients (88%). Adjuvant postoperative irradiation was delivered in eight patients. Five patients died of disease in spite of the different clinicopathologic characteristics and aggressiveness of the surgery and irradiation. None of the parameters studied correlated with the final outcome.

Adenocarcinoma↗
PubMed1982

[Infantile hamartoma of the chest wall].

Although chest wall osseous tumors are frequent in infancy, a few cases have been reported in the last years. Most of these cases had a benign course although in many of them a malignant histological diagnosis was formerly made. We report a case of chest wall tumor in a two months old boy. The histological pattern was similar to that described by McLeod and Dahlin as "chest wall hamartoma of the infancy". Seven months after the tumor resection the child lived well and without recurrence.

Hamartoma↗