Fibrohistiocitoma maligno / Malignant fibrohystiocytoma

RESUMEN El fibrohistiocitoma maligno es el sarcoma de partes blandas más frecuente en adultos; es poco frecuente como tumor primario cutáneo. Presenta predilección por el sexo masculino con una mayor incidencia entre la quinta y sexta década de la vida. Se localiza predominantemente en las extremidades. Presentamos a continuación el caso clínico de un paciente con diagnóstico de fibrohistiocitoma maligno localizado en hallux de pie derecho y realizaremos una revisión de la literatura.

ABSTRACT Malignant fibrohistiocytoma is the most frequent soft tissue tumor in adults; it is rare as a primary cutaneous tumor. It presents a predilection for males with the highest incidence between the fifth and sixth decade of life. It is located predominantly on the extremities. We will perform a literature review. We present below the clinical case of a patient diagnosed with malignant fibrohistiocytoma located in hallux of the right foot.

Unique cytologic and histologic features of a suspected cutaneous xanthoma in a dog.

A 4-year-old spayed female American Staffordshire Terrier presented to the U-Vet Animal Hospital, Werribee, Australia, with a cutaneous mass that had been slowly growing over 12 months. Cytologic evaluation showed cohesive to individualized, vacuolated spindled cells often arranged in a perivascular pattern. The mass was completely excised, and the histopathologic examination demonstrated sheets of vacuolated spindled to round cells expanding the full thickness of the dermis. The cells demonstrated both Iba1 and CD18 antibody binding, leading to an initial interpretation of histiocytic sarcoma. Given the discordance with the clinical presentation, further immunohistochemistry (IHC) was performed. The cells demonstrated strong CD204 antibody binding and did not bind E-cadherin antibody, consistent with a dermal macrophage origin. Ki-67 antibody binding was regionally variable from <5% to 25%, with more regions that had low Ki-67 expression. A fasted serum biochemistry panel revealed hypertriglyceridemia and persistent hypercholesterolemia. Based on clinical, microscopic, biochemical, and IHC results, the final interpretation was an indolent dermal histiocytic proliferation of macrophage origin, with a preference for cutaneous xanthoma or reactive dermal fibrohistiocytoma.

Fibrohistiocitoma aneurismático: A propósito de un caso / Fibrohistiocytoma aneurysmal: Report of a case

El fibrohistiocitoma aneurismático, es una distintiva pero pobremente reconocida variante clínico-patológica, de los fibrohistiocitomas cutáneos. Podría resultar de la proliferación de vasos sanguíneos y hemorragia, dentro de un fibrohistiocitoma cutáneo común. Se reporta el caso de un paciente de 39 años de edad, con una lesión tumoral en cara externa del codo izquierdo. Discutiremos el reconocimiento clínico, la histopatología y la diferenciación histológica con otros tumores.

Aneurysmal fibrohistiocytoma is a distinctive but poorly recognized clinical-pathological variant of cutaneous fibrohistiocytomas. It could result from the proliferation of blood vessels and hemorrhage within a common cutaneous fibrohistiocytoma. We report a case of a 39-year-old patient with a tumor lesion on the left elbow. We will discuss clinical recognition, histopathology and histological differentiation with other tumors.

Fibrohistiocytoma combined with an aneurysmal bone cyst at T7 in a 63-year-old woman.

We present a case of spinal tumor, with fibrohistiocytoma combined with aneurysmal bone cyst (ABC) at the pedicle and transverse process of T7 in a 63-year-old female. ABC is a rare skeletal tumor and spinal ABC is extremely rare. Fibrohistiocytoma is a type of primary benign bone tumor. ABC is also a rare bone tumor that most often occurs in the pelvis. The combined lesion of two primary bone benign tumors is relatively rare in clinic. In addition, fibrohistiocytoma and ABC are widely confused with other giant cell containing tumors of the bone. X-rays, magnetic resonance imaging (MRI) and positron emission tomography-computed tomography (PET-CT) scans were performed and assessed. Finally, the diagnosis was confirmed by pathological tests. The patient underwent surgery and had an extremely good recovery. The correct diagnosis of a spine tumor is important when determining the surgical procedure.

Hemipelvectomia interna alargada no tratamento de fibro-histiocitomamaligno radioinduzido: relato de caso / Enlargd internall hemipelvectomy for postradiation fibrohistiocitoma: a case report

Introdução. O sarcoma radioinduzido é entidade rara que pode ocorrer em qualquer tecido irradiado. O subtipo histológico mais comum é o fibro-histiocitoma maligno, cujo comportamento é agressivo com prognóstico sombrio. Em geral, a ressecção ampla tridimensional com margens livres tem sido o melhor tratamento curativo. Caso. Os autores relatam um caso deste raro tipo de sarcoma localmente avançado, na região púbica, tratadopor hemipelvectomia interna alargada, com boa evolução. A ressecção teve margens livres. Não houve recidiva até o momento, com seguimento de um ano. Conclusão. A despeito de seu comportamento agressivo, o fibro-histiocitoma radioinduzido da região púbica com invasão óssea pode ser adequadamente controlado com ressecção ampla e hemipelvectomia alargada.

Introduction. Postradiation sarcoma is a rare entity that may occur on every irradiated tissue. The most common histological subtype is malignant fibrohistiocytoma. It presents both aggressive behavior and dismal prognosis. Generally, wide resection with free margins has been considered the best curative treatment. Case. The authors present a single case of this rare type of locally advanced sarcoma on the pubis region that was treated by means of enlarged internal hemipelvectomy with a good outcome. Resection was R0 (free-margins). There was no recurrence after one year of follow-up period. Conclusion. Despite its aggressive behavior, postradiation fibrohistiocytoma on the pubic region with bone invasion may be controlled by means of enlarged internal hemipelvectomy.

A Case of Benign Fibrohistiocytoma on Nasal Vestibule

Benign fibrohistiocytoma is a very rare tumor in the head and neck. There has never before been a reported case of this tumor originating from the nasal vestibule. Recently, we experienced a case of benign fibrohistiocytoma on the nasal vestibule in a 12-year-old boy who complained of nasal obstruction and recurrent epistaxis. During physical examination, we found a 1x1 cm-sized mass on his right nasal vestibule. Excision and repair with full thickness skin graft was performed and diagnosis of benign fibrohistiocytoma was made with pathologic and clinical findings. We present this rare case with review of the clinical and pathological features.