Lipomatosis arborescente. Presentación de un caso pediátrico / Arborescens lipomatosis in a young girl. A case report

La lipomatosis sinovial es una entidad, rara y benigna, de la membrana sinovial, que fue descrita por Albert Hoffa en 1904, y afecta con mayor frecuencia a la articulación de la rodilla, pudiendo presentarse en otras articulaciones. Ocurre en varones de mediana edad y, raramente, en niños. Siendo normalmente monoarticular, en algunos casos aparece en más de una articulación. Su etiología es desconocida y se habla de un proceso reactivo más que neoplásico. Esta enfermedad tiene una morfología radiológica, macroscópica y microscópica característicamente arborescente, por infiltración adiposa del tejido subsinovial, que es clave para su diagnóstico. Presentamos el caso de una niña de 12 años de edad, realizándose revisión de los hallazgos radiológicos y patológicos, así como su diagnóstico diferencial con otras entidades y su tratamiento (AU)

Synovial lipomatosis, described by Albert Hoffa in 1904, is a rare and benign entity of the synovial membrane. The knee joint is the most frequent site, although it can occur in other joints. Middle-aged men are most often affected; it is rarely found in children. It is normally monoarticular, although in some cases it appears in more than one joint. Of unknown etiology, it is thought to be a reactive, rather than a neoplastic, process. The pathology shows characteristic arborescent radiological, macroscopic and microscopic morphology due to adipose infiltration of sub-synovial tissue, which is essential for diagnosis. We report a case of synovial lipomatosis in a 12 year old girl and discuss the radiological and pathological findings, differential diagnosis and treatment (AU)

Coristomas cartilaginosos orofaríngeos: un diagnóstico de exclusión de una entidad infrecuente / Choristomas cartilaginous oropharyngeal, diagnosis of exclusion of a rare entity

Los coristomas cartilaginosos de la cavidad orofaríngea son entidades benignas infrecuentes, cuyo diagnóstico puede ser confundido con verdaderas neoplasias. Presentamos 2 casos de esta entidad de localización en lengua y amígdala en los cuales el tratamiento quirúrgico resultó curativo (AU)

Oropharyngeal cartilaginous choristoma is a rare entity which can be confused with a malignant lesion. We report 2 cases; one in the tongue and another in the tonsil. Both were successfully treated with surgery (AU)

"Sclerosing" Pelvic Floor Rhabdomyoma.

PURPOSE: This article reports on a sclerosing perineal-perianal rhabdomyoma in an adult woman. A review of the literature disclosed no reference to this histological form of rhabdomyoma in women. METHODS AND RESULTS: We describe the case of a 48-year-old woman. At physical examination, a firm nodular lesion was identified in the left lateral perianal-perineal region. Histologically, it comprised rounded and elongated muscle fibers displaying no evident atypia, within a stroma exhibiting marked sclerosis and mild lymphoid infiltrate. At immunohistochemical examination, tumor cells stained for desmin, muscle-specific actin, and myogenin. CONCLUSIONS: Skeletal muscle rhabdomyomas are rare benign tumors, generally divided into 3 major categories depending on their clinical and morphological characteristics: fetal, adult, and genital. An unusual histological variant of the genital form has recently been reported in men, characterized by the presence of predominantly mature muscle fibers and marked sclerosis. We document such a lesion in a female patient for the first time.