Radiation-induced Leiomyosarcoma of the Oral Cavity: A Rare Occurrence Detected on 18F-FDG PET/CT

Temporal and spatial patterns of recurrence in oral squamous cell carcinoma, a single-center retrospective cohort study in China

BACKGROUND

Oral squamous cell carcinoma (OSCC) is an invasive cancer with a high recurrence rate. Most clinical studies have focused on the prognosis of patients with OSCC, few have investigated the causes and interventions that affect the recurrence. Our study is to explore the temporal and spatial patterns of recurrence in OSCC.

METHODS

234 OSCC patients with recurrence in our hospital and 64 OSCC patients with recurrence in TCGA database were included in the study. Log-rank test and Multivariate Cox Regression Analysis were used to determine whether there was a significant difference between each selected demographic or clinical factors and recurrence. The Kaplan-Meier method was used to plot survival curves for each recurrence interval.

RESULTS

The proportion of OSCC patients in clinical and TCGA with early recurrence was 93.6% and 84.4%, respectively. Age, chewing betel nut, previous radiotherapy, histopathological grading of the primary tumor (poorly differentiated), lymph node metastasis and postoperative infection were found to be associated with the timing of recurrence. It was found that tongue cancer has more regional recurrences, while buccal cancer is mostly local and loco-regional recurrences. The earlier the recurrence, the greater the possibility of local-regional recurrence and the worse the prognosis.

CONCLUSION

Most of recurrent OSCC patients present early recurrence (< 18 months) with poor prognosis, and early recurrence is more prone to local recurrence. Moreover, recurrence site is related with primary site of OSCC.

Primary Inferior Vena Cava Leiomyosarcoma With Hepatic Metastases on FDG PET/CT

ABSTRACT

Leiomyosarcomas originating from the inferior vena cava are very rare malignant tumors with an extremely poor prognosis. We report FDG PET/CT findings of pathology-proven hepatic metastases from leiomyosarcoma originating from the inferior vena cava in a young woman whose initial presentation was worsening abdominal and chest pain.

Leiomyosarcoma: a rare sinonasal malignancy

Leiomyosarcomas (LMS) are rare sinonasal malignant tumours with 20 cases of nasal LMS previously reported in the literature. An 81-year-old man presented with an incidental left nasal lesion associated with left nasal obstruction and occasional left-sided blood-stained rhinorrhoea. Nasendoscopic examination showed green coloured polyps filling the left nasal cavity with biopsies showing LMS. CT imaging did not show any bony erosion. No metastases were found on positron emission tomography imaging. The patient underwent endoscopic resection and all surgical margins were clear of disease. The patient was declined postoperative radiotherapy, and serial follow-up has not shown any recurrence to date. Nasal LMS are rare sinonasal smooth muscle tumours and symptoms and radiological findings are often non-specific. Therefore, diagnosis is made on histopathological and immunohistochemical analysis. Due to their invasive nature, the treatment of choice is complete surgical resection, with adjuvant therapy reserved for patients with locally advanced or metastatic disease.