[Intestinal calcifying fibrous tumor: case report].

Calcifying fibrous tumor (CFT) is a rare benign lesion of mesenchymal origin that may present similar characteristics to other more common tumors. We present the case of a 36-year-old woman with a tumor in the proximal jejunum, initially suspected to be a gastrointestinal stromal tumor (GIST). Surgical resection was performed, revealing a well-demarcated nodule at the anti-mesenteric border with microscopic features typical of a calcifying fibrous tumor.

Cutaneous Angiomyolipoma-A Distinct Entity That Should Be Separated From Classic Angiomyolipoma: Complete Review of Existing Cases and Defining Fundamental Features.

Cutaneous angiomyolipoma is a rare mesenchymal tumor that is demographically, clinically, and immunohistochemically distinct from its renal and extrarenal counterparts. We present a case of cutaneous angiomyolipoma in the right retroauricular area of a 35-year-old male patient and provide a broad systematic review of the literature and the largest compilation of cutaneous angiomyolipomas reported to date. According to the findings presented in this review, we conclude that cutaneous angiomyolipoma should be completely separated from renal and extrarenal angiomyolipomas and therefore be considered a distinct entity in the classification of skin tumors.

Angiosarcoma of the liver as a cause of fulminant liver failure.

Primary liver sarcomas make up 2% of all malignant neoplasms of the liver; of these, angiosarcoma is the most common type. Primary liver tumours rarely cause fulminant hepatic failure (FHF), which is most frequently caused by non-neoplasmic pathologies. In the case of neoplasms, the most frequent are lymphoma and metastatic carcinomas.

Pure hibernoma of the breast: insights about its origins.

Hibernomas are rare benign tumors composed of cells reminiscent of brown adipose tissue. In the mammary gland, hibernomas are extraordinary rare, with only 4 cases reported previously. We report the fifth case in a 37-year-old woman who presented with a slowly growing mobile mass in her right breast.

[Serous micropapillary invasive carcinoma. Case report on both ovaries].

A subject that has been very controvertial in the last few years in the field of the surgical pathology has been the terminology and the concept of borderline serous tumor of ovary (TSL). Recently the term of micropapillary serous carcinoma was introduced (CSMP) to define a subtype of serous tumors that are characterized for a micropapillary grow pattern and that clinically associated with a more aggressive behavior than the classic TSL since they have an increased risk of invasion, recurrence and extraovarian tumor implantation. The majority of these cases are included within the serous bordering tumors of ovary, being the truly invasive tumors even more infrequent and with more aggressive clinical course.

[Thyroid oncocytic adenoma. A review of the morphological spectrum in four cases].

Oncocytic change involves a cytoplasmic enlargement due to mitochondrial accumulation observed in a wide variety of conditions and in multiple organs. It can be reactive or neoplastic. In the thyroid gland, this change is a metaplastic phenomenon that takes place under different circumstances that promote cellular stress, and could even produce a true neoplasm, both benign or malignant.

Intra-abdominal follicular dendritic cell sarcoma with marked pleomorphic features and aberrant expression of neuroendocrine markers: report of a case with immunohistochemical analysis.

Follicular dendritic cell sarcoma (FDCS) is a very rare malignant tumor arising most frequently in lymph nodes with only few reports of extranodal locations. We report the case of a 35-year-old man with a large retroperitoneal mass. Histologically the tumor was composed of highly pleomorphic cells exhibiting some uncommon features such as an epithelioid appearance, cystic spaces, and multinucleated cells with morphologic features of emperipolesis.

[Kikuchi-Fujimoto disease (histiocytic necrotizing lymphadenopathy) clinicopathologic and immunohistochemical study of 14 cases and its differential diagnosis with other reactive and neoplastic necrotizing lymphadenopathies].

Kikuchi-Fujimoto disease also known as histiocytic necrotizing lymphadenopaty (HNL) is a rare entity, originally described in Japanese population, although currently it has been described all over the world. It is more frequent in young women and it is usually located in cervical lymph nodes. We report 14 cases of HNL in Mexican population, their clinicopathological and immunohistochemical study as well as a comparative study with other necrotizing lymphadenopaties due to B or T-cell lymphomas, tuberculosis, Epstein Barr virus infection, and non-specific necrosis.

[Expression of p53 and BCI-2 as prognostic markers and for anatomical location in gastrointestinal stromal tumors (GIST). Clinico-pathological and immunohistochemistry study of 19 cases].

Objective: To correlate the expression of p53 and BCl-2 with the clinical outcome and anatomic location of the gastrointestinal stromal tumours (GIST).

Background Data: The GIST are the most common nonepithelial neoplasm of the gastrointestinal tract. In spite of the existence of a wide range of predictive factors, their clinical outcome is unpredictable.