Kil Sun Park

Normal bronchial and pulmonary arterial diameters measured by thin section CT.

Objective We undertook this study to evaluate the normal values of the artery–bronchus ratio (ABR) and the bronchial lumen ratio (BLR) at subsegmental levels and to determine whether these values can be used as objective parameters for evaluation of various diseases involving the bronchovascular trees. Materials and Methods We analyzed high-resolution CT of 30 patients without cardiopulmonary diseases. The CT studies were performed with 5 mm collimation at 5 mm intervals from the carina to the level of the inferior pulmonary vein and with 1.5 mm collimation at 10 mm intervals through the remainder of the lung. Both ABR, defined as the outer diameter of the pulmonary artery were divided by the outer diameter of its accompanying bronchus, and BLR, defined as the inner diameter of the bronchus divided by its outer diameter, were measured at the subsegmental level on the display console. Results The mean ABR was 0.98 ± 0.14 (range, 0.53–1.39), and the mean BLR was 0.66 ± 0.06 (range, 0.51–0.86). Although BLR revealed no statistical differences between segments, lobes, and lungs, there were statistically significant differences between the ABRs of segments and between those of lobes. Conclusion There was a wide range of normal values of ABR and BLR. This wide range of values would make these parameters of less value in the evaluation of bronchovascular bundles.

Narrow duplicated or triplicated internal auditory canal (3 cases and review of literature): can we regard the separated narrow internal auditory canal as the presence of vestibulocochlear nerve fibers?

The narrow duplicated internal auditory canal (IAC) is a very rare malformation, and there is no report about the narrow triplicated IAC in the literature. It has been believed to be associated with congenital sensorineural hearing loss and to be a result of aplasia or hypoplasia of the vestibulocochlear nerve or the cochlear branch. We present 2 cases of unilateral narrow duplicated IAC and 1 case of unilateral narrow triplicated IAC with ipsilateral sensorineural hearing loss. The separated, accessory bony canals delineated on high-resolution computed tomography do not mean the presence of nerve fibers. In previously presented cases and in our case, the separated small canals were vacant and without a cochlear nerve fiber. We present new common radiological findings as follows: the bony canal to the cochlea is very thin and the connection with the modiolus of the cochlea is interrupted in narrow separated IAC.

Unilateral Hydronephrosis and Hydroureter by Foreign Body in Urinary Bladder: A Case Report

Foreign bodies inserted through the urethra are often found in the urinary bladder. We presently report the first case of hydronephrosis and hydroureter due to direct compression in the urinary bladder by silicon, which had been introduced by the patient himself 2 yr prior to presentation with severe right flank pain. Computed tomography indicated a convoluted, high-attenuation mass in the urinary bladder; unilateral hydronephrosis and hydroureter were also present due to direct compression by the mass. The foreign body was removed using a cystoscope. This foreign body was proven to be silicon.

Primary hepatic peripheral T-cell lymphoma mimicking hepatocellular carcinoma: a case report

Peripheral T-cell lymphomas (PTCLs) are aggressive neoplasms which may involve the liver. The imaging manifestations of hepatic lymphoma are highly variable and show overlapping appearances of numerous other hepatic diseases. As the management and prognosis of lymphoma differ markedly from those of other malignant diseases, prompt diagnosis and early effective treatment are very important. Here, we report an atypical case of primary PTCL not otherwise specified involving the liver that exhibited a solitary hepatic mass mimicking hepatocellular carcinoma (HCC) on CT. Liver biopsy is not commonly recommended in highly suspicious cases of HCC. However, in a patient without risk factors for HCC, consideration of other diagnostic possibilities is required and needle biopsy may be a more rational choice. An imaging approach, based on a careful review of clinical and laboratory findings is essential to prevent false-positive diagnosis of HCC and subsequent invasive treatment.