Malignant triton tumor below the peritoneal reflection: a case report

Malignant triton tumor of uterus: A case report and literature review

Malignant triton tumor (MTT) is a highly aggressive malignant neoplasm, classified as a variant of malignant peripheral nerve sheath tumor with rhabdomyoblastic differentiation. There are few reports that MTT occurred in urogenital system. In the present study, we report the first MTT occurring in the uterus. A 57-year-old woman came to the emergency department due to persistent vaginal bleeding for 2 months. The gynecological palpation found that a club-shaped excrescence existed in the vagina about 7 cm × 3 cm × 3 cm. The mass located in the lower segment of the uterus and the cervix was confirmed by gynecological vaginal ultrasound and magnetic resonance imaging, which was preliminarily diagnosed as cervical carcinoma. After neoplasm punch biopsy, the pathological diagnosis was malignant triton tumor. The patient finally lost follow-up. This is the first report about MTT in the uterus and suggests that pathological biopsy combined with imaging examination is necessary for the diagnosis of rarely MTT.

Malignant triton tumor of the kidney in a child: A case report

Introduction

Malignant triton tumor (MTT) is an extremely rare variant of the malignant peripheral nerve sheath tumors (MPNSTs) with rhabdomyosarcomatous differentiation, which was first described in 1932 by Mason. MTT affects, in most cases, patients under 35 years of age, and it is usually manifested as a mass that may or not be painful. However, the incidence in pediatric patients is atypical. This tumor presents an aggressive course and limited survival rate, and the prognosis is different between individuals with or without a concomitant diagnosis of neurofibromatosis type 1 (NF1). Currently, the recommended treatment is surgical resection, and adjuvant chemotherapy and radiotherapy, but its efficacy is not yet clear.

Presentation of the case

A 13-year-old female patient was referred to the pediatric oncology service due to the presence of an abdominal mass and weight loss, initially diagnosed with Wilms' tumor. After extensive investigation, surgical resection, and immunohistopathological evaluation, the diagnosis of malignant triton tumor was confirmed. The patient also underwent cycles of chemotherapy after resection, and is currently awaiting immunotherapy.

Discussion and conclusion

Malignant triton tumor is extremely rare and difficult to diagnose, especially in children or young people, age groups in which the incidence of the disease is even lower. This may be the reason it is rarely suspected, and it was a great challenge for the clinical care team. It is essential to consider and investigate this possibility of differential diagnosis, as patients diagnosed with this malignant tumor have a low survival rate and poor prognosis.

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Malignant triton tumor (MTT) is an extremely rare histological subtype of MPNSTs.

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MTT is an MPNST with rhabdomyosarcomatous differentiation.

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MTT is an extremely rare type of neoplasia, especially in pediatric patients.

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The kidney is an uncommon growth site of MTT.

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MTT presents a complex anatomopathological and immunohistochemical diagnosis.