Radiography, Doppler sonography, and MR angiography of malignant pulmonary hemangiopericytoma

Imaging spectrum of mesenteric masses

Mesenteries are extensions of the visceral and parietal peritoneum consisting of fat, vessels, nerves, and lymphatics. Mesenteric masses have a wide differential diagnosis with neoplastic, infectious, or inflammatory etiologies and can either be solid or cystic. Imaging features are critical for the diagnosis. We review the epidemiology, imaging spectrum, and differentiating features and treatment of mesenteric masses.

Mediastinal Solitary Fibrous Tumor Diagnosed by Endobronchial Ultrasound-Directed Biopsy

BACKGROUND Solitary fibrous tumors of the middle mediastinal space are uncommon and often not discovered until symptoms secondary to compression of adjacent structures occur. Diagnosis requires surgical biopsy and histological tissue analysis. We describe the ECHO appearance of the solitary fibrous tumor and successful non-invasive EBUS diagnosis. This method of diagnosis allowed for surgical planning for resection and allowed us to exclude non-surgical diseases, such as small cell carcinoma. CASE REPORT A 32-year-old man presented to his primary care physician with worsening intermittent chronic chest pain with recent progressive dysphagia, cough, and dyspnea. Physical examination and routine laboratory work-up were unrevealing. Chest radiograph and computed tomography (CT) of the chest revealed a middle mediastinal mass. Flexible bronchoscopy confirmed extrinsic compression of right and left bronchial trees. Endobronchial ultrasound (EBUS) was used to biopsy the mass and the diagnosis of solitary fibrous tumor was confirmed. The patient underwent successful tumor resection and was discharged home after an uneventful postoperative period. CONCLUSIONS Endobronchial ultrasound-directed tissue biopsy is an appropriate modality for suspected solitary fibrous tumors of the mediastinum. To our knowledge, this is only the second reported case of SFT diagnosed by EBUS-TBNA. Our case uniquely demonstrates the advantages of pre-surgical diagnosis of mediastinal masses with EBUS-TBNA when the diagnosis SFT is suggested on CT and US imaging.

Characteristic endobronchial ultrasound image of hemangiopericytoma/solitary fibrous tumor

Hemangiopericytomatous pattern is characteristic of hemangiopericytoma/solitary fibrous tumor (HPC/SFT) and certain histological features might indicate a malignant potential, but the behavior of HPC/SFT is unpredictable. Endobronchial ultrasound (EBUS) is a useful diagnostic device in that the ultrasonographic image can be viewed and the EBUS-transbronchial needle aspiration can obtain a biopsied sample. We herein report a patient undergoing multiple surgical resections of recurrent HPC/SFT. A 74-year-old man had undergone right upper lobectomy for HPC/SFT 15 years ago. He received a partial resection of the left lung and a resection of the anterior mediastinal mass for its recurrences 13 years and six years ago, respectively. He had also undergone surgery for gastric carcinoma two years ago. He then presented with a tumor measuring 3 x 4 cm in the subcarinal area. Preoperative EBUS revealed a tumor with abundant thin-walled vessel-like structures, which was consistent with HPC/SFT. The tumor was completely resected and was finally diagnosed as low-grade malignant HPC/SFT.

Hemangiopericytoma: an unusual cause of peritoneal carcinomatosis

Hemangiopericytoma, a rare mesenchymal tumour, is believed to originate from the pericyte of Zimmermann. It may affect every organ in the body. Recurrences after treatment and metastasis are well known. However, presentation of hemangiopericytoma with peritoneal carcinomatosis is not documented in literature. To the best our knowledge, we report the imaging findings of the first histologically proven case of hemangiopericytoma with peritoneal carcinomatosis.

Hepatic metastases of hemangiopericytoma: contrast-enhanced MRI, contrast-enhanced ultrasonography and angiography findings

Hemangiopericytoma is a rare and characteristically hypervascular tumour. We report a case of hepatic metastases of hemangiopericytoma for which there was correlative imaging by ultrasonography, ultrasonography with second-generation contrast agent (BR1), computed tomography, gadolinium-enhanced, Gd-BOPTA-enhanced and ferumoxides-enhanced magnetic resonance, and angiography. To our knowledge, this is the first reported case in which all these modalities were used in the diagnostic evaluation.