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Esophageal cancer is a leading cause of cancer mortality worldwide. Complete resection of esophageal cancer and adjacent malignant lymph nodes is the only potentially curative treatment. Accurate preoperative staging and assessment of therapeutic response after neoadjuvant therapy are crucial in determining the most suitable therapy and avoiding inappropriate attempts at curative surgery. Computed tomography (CT) is recommended for initial imaging following confirmation of malignancy at pathologic analysis, primarily to rule out unresectable or distant metastatic disease. With the advent of multidetector CT, use of thin sections and multiplanar reformation allows more accurate staging of esophageal cancer. Endoscopic ultrasonography (US) is the best modality for determining the depth of tumor invasion and presence of regional lymph node involvement. Combined use of fine-needle aspiration and endoscopic US can improve assessment of lymph node involvement. Positron emission tomography (PET) is useful for assessment of distant metastases but is not appropriate for detecting and staging primary tumors. PET may also be helpful in restaging after neoadjuvant therapy, since it allows identification of early response to treatment and detection of interval distant metastases. Each imaging modality has its advantages and disadvantages; therefore, CT, endoscopic US, and PET should be considered complementary modalities for preoperative staging and therapeutic monitoring of patients with esophageal cancer.

GGOs which persisted for several years showed an indolent course. Large lesions with a solid portion and GGOs in male or elderly individuals may be cause for more concern, as these factors were associated with size increase. Resection should be considered if GGOs show character changes, as these may be associated with rapid size progression.

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This study showed that synchronous BAC and/or ADC can have different EGFR or K-ras mutational profiles suggesting these lesions arise as independent events rather than intrapulmonary spread or systemic metastasis. This has significant implication in staging and treatment. These findings might be a clue to establish guidelines of the multiple neoplastic lung nodules with GGO.

There are two distinctive types of radiologic manifestations in Castleman disease of the abdomen: localized and disseminated. The localized type usually shows single or multiple discrete masses, and the disseminated type frequently shows nonspecific organomegaly and lymphadenopathy.

malignant disease is greater than 80% and 90%, respectively [10-16]. However, to our knowledge, the accuracy of CT-guided core biopsy of GGO lesions has not been reported in detail. Thus, the purpose of this study was to evaluate the diagnostic accuracy of CTguided core biopsy of GGO lesions. Materials and Methods Our institutional review board approved this study and waived informed patient consent. Study Population and Biopsy Indication We retrospectively reviewed the medical and imaging records of all patients who underwent CT-guided needle biopsy of pulmonary nodules at our institution between June 1, 2003, and April 30, 2006. Two chest radiologists who had 8 and 12 years of experience in chest CT interpretation identified GGO lesions on CT by consensus. Images were displayed with a lung window setting

ALK-rearranged lung cancer has characteristic clinical and imaging features compared with EGFR mutant or WT/WT cohorts. Our findings suggest that young age, lobulated margin, solid lesion, and hypoattenuation at contrast-enhanced CT scan are important predictors of ALK-rearranged lung cancer.