Follicular dendritic cell sarcoma of gastrointestinal tract with two emerging distinct subtypes: a case report and systemic review

Epstein-Barr virus-positive inflammatory follicular dendritic cell sarcoma: A brief report of a rare neoplasm diagnosed with cytopathology on a splenic biopsy

Splenic biopsies for cytology remain challenging due to the inherent difficulty in obtaining adequate samples and the paucity of literature on rare entities arising in the spleen. Among these, are tumors arising from blood vessels, lymphomas and rarely, mesenchymal dendritic cell neoplasms. An important but rarely considered entity primarily arising in the spleen is Epstein-Barr virus-positive inflammatory follicular dendritic cell sarcoma (EBV+ IFDCS). EBV+ IFDCS is an indolent neoplasm with useful cytomorphologic and distinct biologic characteristics that can be evaluated on fine-needle aspiration (FNA) cytology and small biopsies. In this report, we present a challenging case with the final diagnosis facilitated by cytomorphology and diagnostic markers in an ambiguous initial presentation.

FDG PET/CT in Follicular Dendritic Cell Sarcoma of the Jejunum With Hepatic Metastasis

ABSTRACT

Follicular dendritic cell sarcoma of the gastrointestinal tract is a rare malignancy. We describe contrast-enhanced CT and FDG PET/CT findings in a case of jejunal follicular dendritic cell sarcoma with hepatic metastasis. The primary jejunal tumor showed inhomogeneous enhancement on contrast-enhanced CT and intense FDG uptake on PET/CT mimicking adenocarcinoma or gastrointestinal stromal tumor. The hepatic metastatic tumor showed hypovascularity on contrast-enhanced CT and mild FDG uptake on PET/CT. This case indicates that follicular dendritic cell sarcoma should be included in the differential diagnosis of the hypermetabolic intestinal lesions.

An incidental discovery of a gastric follicular dendritic cell sarcoma: A rare case report and a literature review

Introduction: Follicular dendritic cell sarcomas (FDCS) are rare tumours, typically seen in lymph nodes. However, in about one third of the reported cases, a FDCS presents as an extranodal mass. Involvement of the gastrointestinal tract is rare, and the stomach is even rarer with only four cases described to date. The aim of this study was to review clinical characteristics, pathologic features, emphasize on differential diagnosis and discuss therapeutic modalities and prognosis of this rare entity.Case presentation: We report on a 36-year-old female patient with no past medical history, an incidentally discovered FDCS located in the stomach with the presence of lymph node metastasis at the time of diagnosis. The diagnosis of a FDCS was made on morphological and immunohistochemical findings where tumor cells expressed CD21 and CD23. The tumor was resected by gastrectomy with extended para-aortic lymphadenectomy, with uneventful postoperative course.Conclusions: Due to its rarity, FDCS is rarely included in the differential diagnosis of gastrointestinal spindle cell tumors. Complete surgical resection is the current gold standard of treatment.