Radiological features of Rosai-Dorfman disease: case series and review of the literature

Case report: A rare case of isolated sigmoid Rosai-Dorfman disease on contrast-enhanced CT and 18F-FDG PET/CT

Rosai-Dorfman disease (RDD) is an uncommon histiocytic disorder that occurs in nodal and/or extranodal sites. Extranodal RDD exhibits a wide range of clinical and radiological presentations, frequently leading to misdiagnoses. Involvement of the gastrointestinal (GI) system is uncommon, accounting for less than 1% of the reported cases. Here we present a case of a 54-year-old male who complained of abdominal distention and was diagnosed with RDD affecting the sigmoid colon, manifesting as a sigmoid mass. The patient had a past medical history of liver transplantation due to hepatocellular carcinoma (HC). This report details the multiphase contrast-enhanced computed tomography (CT) and fluorodeoxyglucose (18F-FDG) positron emission tomography (PET-CT) imaging findings of RDD involving the sigmoid colon without lymphadenopathy, and a review of the relevant literature is provided.

Mediastinal Rosai-Dorfman Disease with KRAS mutation case report and literature review

BACKGROUND

Rosai-Dorfman Disease (RDD) is a rare self-limiting histiocytosis, more prevalent in children and young adults. It typically manifests as painless bilateral massive cervical lymphadenopathy but may also extend to extra-nodal sites, with intrathoracic RDD noted in 2% of cases. Distinguishing mediastinal RDD from thymoma on imaging poses challenges, underscoring the reliance on pathological features and immunohistochemical staining for diagnosis.

CASE PRESENTATION

Patient, male, 33 years old, underwent lung a CT revealing an enlarged round soft tissue shadow in the anterior superior mediastinum, compared to a year ago. Surgical resection removed the entire mass, thymus, and part of the pericardium, confirming RDD on pathology. Genetic testing using second-generation testing technology identified a KRAS gene point mutation.

CONCLUSIONS

No established treatment protocol currently exists for this disease. However, as genetic mutation research progresses, a novel therapeutic avenue is emerging: targeted therapy integrated with surgical interventions.

Extranodal Rosai-Dorfman Disease: a rare presentation involving anterior chest wall in a middle-aged female

Rosai-Dorfman Disease is a rare benign disorder involving overproduction of immune cells, causing swollen lymph nodes and, in rare cases, the sternum. The sternal involvement may cause chest pain and masses. Diagnosis is confirmed through clinical examination, biopsy, and imaging. Treatment options may include surgery, radiation, or steroids. In this case study, we present an unusual example of extranodal Rosai-Dorfman Disease involving the sternum, bilateral clavicles and first three ribs, and pectoral muscle with no associated lymphadenopathy or systemic symptoms in a 57-year-old female. The etiology, pathology, immunohistochemistry, imaging findings, and treatment options of this unique disease are discussed.

Intracranial Rosai-Dorfman disease: a case report and review of the literature

RDD involving the central nervous system is rarely reported. To better understand the disease and explore the treatments, we reported this case and review the literature.

Rosai-Dorfman disease presenting as autoimmune hemolytic anemia in a male child in Palestine: a case report

Rosai-Dorfman disease (RDD) is a rare, benign non-Langerhans cell histiocytosis predominantly affects lymph nodes and skin. Despite its benign nature, RDD can cause serious hematological complications. A 14-year-old male, presented with 3-month history of hemolytic anemia, lymphadenopathy, hepatosplenomegaly and rash. After thorough investigation, RDD was diagnosed by mediastinal lymph node biopsy that revealed presence of S100 and CD68-positive cells with absence of CD1a confirming the diagnosis of RDD. Treatment involved combination of steroids and Rituximab, which proved to be highly effective. The patient had dramatic improvement and entered remission, with follow-up period of 2 years. It is important to note that although RDD is a rare disease, it causes severe complications, as evidenced by the patient's parameters. Thus, prompt diagnosis and treatment are paramount. Histological diagnosis is of great value, as it helps confirming and guiding treatment decisions. With the right treatment, patients can experience great recovery and quality of life.