Spindle Cell Carcinoma: A Confirmatory Diagnostic Analysis by Immunohistochemical Studies

Introduction: WHO defines it as a ‘‘carcinoma within which there are some elements resembling a squamous cell carcinoma that are admixed with a spindle cell component. Spindle cell carcinoma is an uncommon poorly differentiated type of SCC com- prising up to 3% of SCC and it is also known as sarcomatoid carcinoma which is a rare biphasic malignant neoplasm. . Case Report: A 20 year old female patient complains of pain and growth in lower front teeth region since 3 months and gave a history of growth 2yrs back in the front teeth region for which she has been operated but it has recurred again. Discussion: The histological features mimicked other connective tissue sarcomas & spindle cell malignancies at light micro- scopic level. Hence, after undergoing immunohistochemistryA careful study based on clinical, radiological and histopathologi- cal and immunohistochemical examination was done and a final diagnosis of spindle cell carcinoma was given.

Tumor de colisión en el ovario, con fibrotecoma. Reporte de un caso / Collision tumor in the ovary, with fibrothecoma. Case report

Resumen ANTECEDENTES: La coincidencia temporo-espacial de dos o más neoplasias benignas, malignas o combinadas, que afectan a un mismo órgano o tejido es lo que define al tumor de colisión, con diferencias conductuales, genéticas e histológicas. Los tumores de colisión ovárica son un subtipo raro. CASO CLÍNICO: Paciente de 53 años, que acudió al servicio de Urgencias debido a un dolor intermitente de siete meses de evolución que, en las últimas semanas, se intensificó y se agregaron náuseas y vómitos. Durante la exploración abdominal se detectó un aumento de volumen en el área pélvica, sin irritación peritoneal. Los marcadores tumorales: CA-125, CA 19-9 y antígeno carcinoembrionario se reportaron en parámetros normales. La ecografía pélvica informó la existencia de una imagen quística simple y compleja, con componente sólido. El examen de anatomía patológica diagnosticó: tumor de colisión en el ovario izquierdo. CONCLUSION: Los tumores de colisión en el ovario son poco frecuentes según lo reportado en la bibliografía. El diagnóstico anatomopatológico minucioso y el seguimiento clínico-radiológico adecuado son necesarios para descartar los tumores de colisión.

Abstract BACKGROUND: The temporal-spatial coincidence of two or more benign, malignant or combined neoplasms that affect the same organ or tissue is what defines the collision tumor, with behavioral, genetic and histological differences. Ovarian collision tumors are a rare subtype. CLINICAL CASE: A 53-year-old patient, who came to the Emergency Department due to intermittent pain of seven months' evolution, which, in recent weeks, intensified and nausea and vomiting were added. During abdominal examination, an increase in volume was detected in the pelvic area, without peritoneal irritation. Tumor markers: CA-125, CA 19-9 and carcinoembryonic antigen were reported in normal parameters. Pelvic ultrasound reported the existence of a simple and complex cystic image, with a solid component. Pathological anatomy examination diagnosed: collision tumor in the left ovary. CONCLUSION: Collision tumors in the ovary are rare according to reports in the literature. A thorough pathological diagnosis and adequate clinical-radiological follow-up are necessary to rule out colliding tumors.

Collision of two tumors: A case report of a Lung Adenocarcinoma with metastasis to a Pituitary Adenoma / Journal of the ASEAN Federation of Endocrine Societies

@#A collision tumor involving metastasis to a pituitary adenoma is rare. We describe a case of a 68-year-old Bidayuh woman with underlying treatment-responsive lung adenocarcinoma, who presented with mass effect, panhypopituitarism and polyuria. Her initial imaging study reported pituitary macroadenoma, and she was treated with hormone replacement therapy. She then underwent transsphenoidal tumor debulking surgery with subsequent histopathological findings of a collision tumor of an adenocarcinoma with metastasis to a non-functioning pituitary adenoma.

Pancreatic collision tumor: mucinous cystadenoma and celar cell renal cell carcinoma metastasis

We present a clinical, radiological, surgical, and pathological correlation case of a 49-year-old woman with a prior nephrectomy due to a clear cell renal cell carcinoma, who was then diagnosed with a multilocular cystic lesion in the pancreatic tail after a routine ultrasound. Computed tomography and magnetic resonance cholangiopancreatography showed a multilocular cystic lesion with a hypervascular wall nodule in the pancreas. The patient underwent a distal pancreatectomy and had a final diagnosis of pancreatic mucinous cystadenoma with an associated component of clear cell renal cell carcinoma (collision tumor of the pancreas). (AU)

Collision tumor of ovary: a case report on bilateral dermoid cyst with co-existing unilateral mucinous cystadenoma

A collision tumor is the coexistence of two adjacent, but histologically distinct tumors without histological admixture in the same tissue or organ. Such tumors have often been reported in various organs, but location in the ovary is rare. The juxtaposition with dermoid cysts has been reported as comprising approximately 5% of benign mucinous ovarian tumors and rare examples of proliferating mucinous tumors. Authors are reporting a case of collision tumor which included benign mucinous cystadenoma and benign cystic teratoma. The gynecologists and pathologists should be aware of such combination of tumors. The case was diagnosed post-operatively. It is important to correctly diagnose the component of tumor for further management and favourable prognosis. Frozen section intra-operatively plays an important role in diagnosing such tumors.

Collision Tumour of Ovary: A Report of Two Cases.

Collision tumour is defined as the presence of two distinct tumours in the same organ without any histological intermixing. Such tumours involving ovaries are extremely rare. We are presenting report of two cases of ovarian collision tumour. Our first case revealed features of mature cystic teratoma with mucinous cystadenoma. The second case showed components of both mature cystic teratoma and serous cystadenoma. Correct diagnosis of collision tumour will guide the surgeon towards proper treatment and favorable prognosis of patient.

Simultaneous occurrence of Kaposi sarcoma and tuberculosis; Kaposi sarcoma and lymphoma in the same lymph node: a report on two HIV-positive patients from Zimbabwe

Abstract Reports of simultaneous infections and neoplasms in patients with acquired immune deficiency syndrome (AIDS) are occasionally seen in the literature. However, coexistent lymphoma with tuberculosis, and Kaposi sarcoma (KS) with tuberculosis occurring in the same lymph node is rare. Coexistent lesions pose diagnostic difficulties. In this article, we report two HIV-positive patients from Zimbabwe who displayed KS and tuberculosis; KS and diffuse large B-cell lymphoma in the same lymph node. We found only one similar case presentation in the literature, which was reported in India.

Collison Tumor of Adenocarcinoma and Diffuse Large B-Cell Lymphoma in the Rectum: a Case Report and Literature Review

Collision tumor is a synchronous neoplasm wherein two histologically distinct tumors co-exist within the same anastomosis site. Collision tumor can occur in any organ, but the incidence is markedly rare. Additionally, preoperative diagnosis can be challenging to the radiologist. Herein, we report an age 60 male with collision tumor of rectal adenocarcinoma and diffuse large B-cell lymphoma, presented as a semi-annular wall thickening and bulky exophytic mass on MR imaging.

Research progress of esophageal collision tumor / 国际肿瘤学杂志

Esophageal collision tumor is an extremely rare tumor which defined as the concrescence of two distinct primary neoplasms.The pathobiological mechanism of collision tumors is yet to be understood.Clinical symptoms,endoscopic examination and imaging are all lack of specificity.Diagnosing a collision tumor prior to surgery is difficult.Careful pathological examination is crucial for accurately diagnosing the neoplasms in a collision tumor and ensuring appropriate management and a favorable prognosis.Esophageal collision tumors have been increasingly reported in recent years.With the aim of improving the knowledge level of esophageal collision tumor,the clinical and pathological features of this tumor is needed to be summarized.

Collision Tumor Composed of Meningioma and Cavernoma

A true collision tumor is a rare entity composed of two histologically distinct neoplasms coinciding in the same organ. This paper reports a unique case of cerebral collision tumor consisting of two benign components. On the first hand, meningioma which is usually a benign lesion arising from the meningothelial cell in the arachnoidal membrane. On the other, cerebral cavernoma which is a well-circumscribed, benign vascular hamartoma within the brain. To our knowledge, there is no previously documented case of cerebral collision tumor consisting of two benign components. A 56-year-old Caucasian male suffered in 2002 from an atypical meningioma WHO II° located in the left lateral ventricle. Three years after the tumor extirpation, the patient suffered from a hematoma in the fourth ventricle due to a recurrently haemorrhaged cavernoma. In 2008, a recurrence of the tumor in the left lateral ventricle was discovered. Additionally, another tumor located in the quadrigeminal lamina was detected. After surgical resection of the tumor in the left lateral ventricle, the pathological examination confirmed the diagnosis of a collision tumor consisting of components of a meningioma WHO II° and a cavernoma. Postoperatively, no adjuvant treatment was needed and no tumor recurrence is discovered up to the present. A possible explanation for the collision of those two different tumors may be migration of tumor cells mediated by the cerebrospinal fluid. After 5-years of follow-up, there is no sign of any tumor recurrence; therefore, surgical tumor removal without adjuvant therapy seems to be the treatment of choice.

Torsion of Collision Tumor: Dermoid Cyst and Fibrothecoma with Postmenopausal Bleeding

The term collision tumor refers to the coexistence of two adjacent but histological distinct tumors with no histological admixture at the interface. Collision tumors involving ovaries are extremely rare. A collision tumor composed of a dermoid cyst and fibrothecoma is extremely rare in menopausal women. The mechanism of the development of collision tumor is uncertain. During clinical evaluation, differentiation of characters of these ovarian tumors is important to decide appropriate treatment strategies and for good prognosis. We report an unusual clinical manifestation of the torsion of a dermoid cyst and fibrothecoma in the right ovary with postmenopausal bleeding.

Collision tumor of ovary: a rare combination of dysgerminoma and serous cystadenocarcinoma.

Collision tumors of ovary are rare neoplasms and most commonly consist of a teratoma with mucinous tumor. Combination of papillary serous cystsdenocarcinoma and dysgerminoma was yet to be reported. A twenty years female patient presented with a large tumor of right ovary. Microscopically it was diagnosed as a collision tumor of ovary composed of dysgerminoma and serous cystadenocarcinoma. Mixed tumour can arise from divergent differentiation of a single type of stem cell. But components of collision tumor must arise from separate clones. Possibility of collision tumour should always kept in mind during assessment of difficult ovarian tumors to avoid diagnostic error. Key words: Collision tumor, dysgerminoma and serous cystadenocarcinoma.

Medullary and Papillary Thyroid Carcinoma as a Collision Tumor: Report of Five Cases / 대한내분비외과학회지

Medullary thyroid carcinoma and papillary thyroid carcinoma are different subtypes of thyroid carcinoma. The concomitant occurrence of medullary thyroid carcinoma and papillary thyroid carcinoma as a collision tumor is rare. We describe five cases of medullary and papillary thyroid carcinoma as a collision tumor. Four women and one man underwent thyroidectomy for treatment of thyroid cancer. Collision tumor was then detected by histopathologic finding. Genetic testing, point mutation of the BRAF gene or mutation of the RET gene was performed in three cases. However, only one case had point mutation of the BRAF gene. Exact diagnosis of this uncommon event is important because the strategies for treatment of papillary thyroid carcinoma and medullary thyroid carcinoma are different.

Mixed Adenoneuroendocrine Gastric Carcinoma: A Case Report and Review of the Literature

We present a rare case of a gastric mixed adenoneuroendocrine tumor and review the related English literature. A 77-year-old Caucasian woman was admitted to our department with nausea, anorexia, weight loss, and anemia. Esophagogastroduodenoscopy showed a large (>7 cm) ulcerative mass in the greater curvature of the stomach. Biopsy showed the presence of an adenocarcinoma with moderate differentiation. The patient underwent D2 subtotal gastrectomy. Histopathological analysis revealed a diagnosis of mixed gastric adenoneuroendocrine carcinoma. The post-operative course was uneventful, and at the 6-month follow-up, the patient was alive without evidence of recurrence. Our review of the English literature suggested that such cases are most often reported from eastern countries. Multimodal treatment should be the aim for these patients because of the neuroendocrine component of the tumor.

Collision tumor of the ampulla of Vater - Coexistence of neuroendocrine carcinoma and adenocarcinoma: report of a case

Herein, we present a case of coexisting neuroendocrine carcinoma and conventional adenocarcinoma (collision tumor) in the ampulla of Vater, which has seldom been reported in the literature. A 51-year-old man presented with a month history of jaundice. MRCP disclosed about 1.9x1.8 cm sized heterogeneously enhancing mass in ampulla of Vater, causing obstructions of distal common bile duct. He underwent pylorus-preserving pancreaticoduodenectomy under the diagnosis on ampulla of Vater cancer. Pathologically, sections on the ampulla of Vater showed conventional ductal adenocarcinoma extended and collided with poorly differentiated neuroendocrine carcinoma. In conclusion, we hereby presented a case of coexisting neuroendocrine carcinoma and conventional adenocarcinoma in the ampulla of Vater.

A case of collision tumor or transdifferentiation between malignant melanoma and leiomyosarcoma.

A 73-year-old woman was referred to the hospital due to a pigmented, asymptomatic nevus on her right arm that had changed in size and color. The histopathological examination showed a superficial spreading malignant melanoma, Clark level III, 2.26 mm in thickness. Two years later, the patient presented a 10 cm rapidly growing mass in her right axilla. The mass in the axilla measured 12.5 ΄ 9 ΄ cm. It revealed a lymph node metastases with a tumor growth composed of two different contiguous morphological and immunohistochemical components, respectively, melanosomes and leiomyosarcoma. The combination of a melanocytic nevus with other tumor of epidermal or adnexal origin has been described before, but still the co-existence of two different neoplasms within a lesion is still uncommon. The most common combination is basal cell carcinoma and melanocytic nevus or one of them together with a seborrheic keratosis. There have also been occasional reports of rhabdomyosarcomatous differentiation. However, mesenchymal differentiation, and in this case leiomysarcoma, with formation of heterologous elements in melanocytic tumor is very rare. Another plausible explanation may be that malignant melanoma cells could have transdifferentiated into a leiomyosarcomatoid phenotype with resulting metastases of either type. Malignant melanomas have shown a wide variety of cytological changes and can mimic carcinomas, lymphomas, and sarcomas. Spindle cell melanomas commonly simulate spindle cell carcinomas. It has also been documented that desmoplastic melanomas can change into fibroblastic, Schwannian, and myofibroblastic differentiation.

Collision of Three Histologically Distinct Endometrial Cancers of the Uterus

A collision tumor is defined by the presence of two separate masses in one organ, which are pathologically distinct. We described a 70-yr-old patient who complained of abnormal vaginal bleeding with a collision tumor of the uterine corpus. The patient received total hysterectomy, bilateral salphingo-oophorectomy, bilateral pelvic-paraaortic lymphadenectomy, omentectomy, and intraperitoneal chemotherapy. The uterine corpus revealed three separate masses, which were located at the fundus, anterior and posterior wall. Each tumor revealed three pathologically different components, which were malignant mixed mullerian tumor, papillary serous carcinoma, and endometrioid adenocarcinoma. Among these components, only the papillary serous carcinoma component invaded the underlying myometrium and metastasized to the regional lymph node. Adjuvant chemotherapy and radiation therapy were performed. The patient is still alive and has been healthy for the last 8 yr. We have reviewed previously reported cases of collision tumors which have occurred in the uterine corpus.

A Case of Colonic Collision Tumor (Adenocarcinoma and Neuroendocrine Carcinoma) / 대한소화기학회지

Collision tumors of the colon are rare. A 54-year-old man was referred to our hospital for the evaluation of hematochezia. Colonoscopy demonstrated the presence of about 3 cm sized mass in the rectosigmoid junction. After surgical resection, the colonic lesion was histologically composed of two discrete lesions: adenocarcinoma in the superficial layer and poorly differentiated neuroendocrine carcinoma in the deeper layer. We report this case of colonic collision tumor (adenocarcinoma and neuroendocrine carcinoma) with a review of the literature.

Peri-ampullary collision tumor - high grade neuroendocrine carcinoma and signet ring cell carcinoma: A case report and review of literature.

We report a case of 50-year-old male with obstructive jaundice diagnosed as peri-ampullary collision tumor comprising of large cell neuroendocrine carcinoma and signet ring cell carcinoma. The association of neuroendocrine (usually carcinoids) and adenocarcinoma is extremely uncommon with only few case reports available in the reported literature.

Tumor gástrico de colisão: adenocarcinoma associado a tumor carcinoide / Gastric collision tumor: adenocarcinoma associated with carcinoid tumor

Relato de caso de paciente masculino, com 62 anos, com quadro de dor epigástrica e perda ponderal. A tomografia abdominal subsequente revelou lesão vegetante de 3,0 x 1,5 cm no antro gástrico. O paciente foi submetido à gastrectomia parcial com reconstrução em Y de Roux. Após análise anatomopatológica da peça cirúrgica, evidenciou-se tumor carcinoide maligno de 2,0 cm associado ao adenocarcinoma gástrico do tipo intestinal de Lauren e à ausência de metástases linfonodais. A imuno-histoquímica confirmou esses achados. Esse caso é de grande importância para a literatura médica, visto que, ao nosso conhecimento, representa o nono relato de um tumor gástrico dotado dessas características.

A case report of a 62-year-old male patient with a history of epigastric pain and weight loss. A subsequent abdominal computed tomography (CT) scan revealed a vegetative lesion of 3.0 x 1.5 cm in the gastric antrum. The patient underwent partial gastrectomy with Roux-en-Y reconstruction. After anatomic pathological analysis of the surgical specimen, a 2-cm malignant carcinoid tumor, associated with a Lauren intestinal-type gastric adenocarcinoma and no lymph node metastasis, was detected. Immunohistochemistry confirmed these findings. This case is of great importance to the medical literature, because this report represents, to our knowledge, the ninth case of a gastric tumor with these characteristics reported in the literature.