Solitary fibrous tumor developing in the right retroperitoneal space.

Solitary fibrous tumor (SFT) is a rare mesenchymal tumor that is quite aggressive and prone to recurrence and metastasis. Most SFTs are benign, but the identification of the histological features that define the dedifferentiation of SFTs can predict the aggressiveness of the tumor and the presence of a reserved prognosis. We present a rare case of conventional SFTs with features of malignancy and highlight the diagnostic and therapeutic difficulties related to this case. Computed tomography aspect suggested a possible gastrointestinal stromal tumor. Surgical intervention was performed through median laparotomy and a tumor of approximately 15∕12 cm was found, developed from the level of the right retroperitoneal space, and pushing anteriorly the ascending colon, cecum, and terminal ileum. The immunohistochemical aspect correlated with the histopathological one suggests a SFT most likely malignant. In conclusion, the early diagnosis of SFTs is essential in establishing an appropriate treatment. Immunohistochemistry is indispensable in establishing the diagnosis of SFTs.

Immunohistochemical evaluation of tumor budding in colorectal cancer: an important parameter with prognostic value.

We analyzed 82 patients with colorectal cancer (CRC) [75 patients with mucinous adenocarcinoma (ADK) and seven patients with "signet ring cell" ADK] using multi-cytokeratin (CK) AE1∕AE3 immunohistochemical assay. In order to determine the mucinous nature of some of the lymph node metastases of the mucinous colorectal ADKs studied, Periodic Acid Schiff-Alcian Blue (PAS-AB) histochemical staining was used. The counting results were systematized in the following ranges: 0 budding areas; between 1-4 budding areas; between 5-9 budding areas; and =10 tumor budding (TB) areas. The statistical analysis was performed using the Student's t-test. More than half of the cases of mucinous ADK revealed an increased intensity of TB, whereas in the case of "signet ring cell" ADK, an average intensity of this phenomenon. Mucinous ADKs, which were pT3 staged, showed an increased intensity of TB, and those in pT2 stage demonstrated, in the vast majority of cases, the absence of TB. There was a predominance of TB intensity in the absence of vascular-lymphatic invasion. Our study shows the existence of a concordance between tumor progression, the histological type of CRC, vascular-lymphatic invasion and the phenomenon of TB.

An unusual cause of acute surgical abdomen: benign multicystic peritoneal mesothelioma associated with adenomatous tumor.

Benign multicystic peritoneal mesothelioma (BMPM) is a rare disease that primarily affects fertile women with previous abdominal surgery. BMPM associated with adenomatous tumor is a single case report, according to our opinion. The patient had a history of abdominal surgery nine years ago for ovarian cysts. Upon admission, the diagnosis was acute surgical abdomen with acute peritonitis signs. The treatment applied consisted in the removal of peritoneal cysts and partial omentectomy. Only immunohistochemical examination established the diagnosis. The aim is to discuss diagnostic and therapeutic difficulties, underlining that there is no consensus on the use of chemotherapeutics. In conclusion, establishing a preoperative diagnosis is difficult if not impossible. One of the causes of acute surgical abdomen may be BMPM. The malignant transformation of this disease is rare, but the disease recurrence rate is over 50%, and it is often recommended to be monitored through abdominal computed tomography.

Retroperitoneal ancient schwannoma - case presentation.

Retroperitoneal ancient schwannomas are rare tumors, more usually found in the head, neck and flexor surfaces of the extremities. Ancient schwannomas are a subtype of classic schwannomas with a predominance of degenerative changes, calcifications, hemosiderin deposition, interstitial fibrosis and vascular hyaline degeneration. A 33-year-old male was referred on our hospital with a painful mass in left iliac fossa. The patient underwent surgery and intra-operatively the cystic encapsulated mass was found to be retroperitoneal, between the left psoas major muscle and left iliac muscle. On microscopic examination, we found the presence of Schwann cells in regions with high and low cellularity (Antoni A and B areas) and S100 protein immunohistochemical examination was intensely positive, being consistent with the diagnosis of schwannoma. Complete excision is the only method of the surgical treatment; schwannomas are not sensitive to radiotherapy and chemotherapy. Some authors consider that a complete excision of the tumor, while others believe that enucleated or partial excision of the tumor is sufficient. The prognosis is good, and the most common complication is recurrence, possibly by incomplete excision of it being reported in 5-10% of cases. In conclusion, retroperitoneal schwannomas is usually identified incidentally on tomographic images. Diagnosis is based on histopathological examination after surgery and immunohistochemical examination.

Macro- and microanatomic factors involved in the flat bones morphogenesis from the craniofacial system.

The authors present a study both upon eight crania of dead born fetuses having the vertex-coccis distance between 25-29 cm and a human embryocephalic extremity of 18 cm. The crania were examined in the lateral, vertical, frontal, occipital, basal norms. Sagittal sections were performed upon the embryo, and then those sections were microscopically examined after HE staining. We concluded that the cranial arch bones morphogenesis and the facial complex is a long-time development process, which initially started during the early embryogenesis, and it is completed as an adult. Determining factors of the flat bones osteogenesis are the following: vascular, muscle, extracell (mesenchyma) and neuronal factors (rhombencephalon presence).

Mesenteric inflammatory veno-occlusive disease as a rare cause of acute abdomen.

Mesenteric inflammatory veno-occlusive disease is a rare but recognized cause of intestinal ischemia, who can be defined as phlebitis or venulitis affecting mesentery or the bowel, without any evidence of coexisting of an obvious predisposing cause or a coexisting arterial inflammatory involvement. We report the case of a male patient, 63 year old, admitted in the Emergency County Hospital of Craiova, who after presenting with an acute abdomen, underwent exploratory laparotomy and resection of the ischemic sigmoid, temporary colostomy and after four months we reintroduced descendent colon in the digestive transit. The resected specimen of the patient was examined histopathologically, and distinctive histopathological characteristics of the mesenteric inflammatory veno-occlusive disease were identified.

Ectopic osteogenesis in the rectus sheath.

Although was published many cases of ectopic osteogenesis of traumatic, neurogenic cause or hereditable form, the etiology of ectopic osteogenesis remaining unknown. We present ectopic osteogenesis in the rectus abdominal sheath. The study material was represented from fragments of ectopic bones discovered in rectus sheath of four patients suffering iterative surgical abdominal interventions. The pieces of ectopic bone were decalcified and then were made to the standard techniques (paraffin inclusion, general techniques dyeing). The process of ectopic osteogenesis was analyzed through microscopically study to seriated sections of discovered piece, finding the presence of the hematopoesis foci. We conclude that is important identifying and characterizing the osteoinductor agents because these allowed the study of osteogenesis to the cellular level and make an estimation of the abnormally bone developing mechanisms. A possible osteoinductor factor has been considerate the non-absorbable wound closure material.