We present UBVRI CCD photometry of the Type Ie supernova SN 19941 in M51 which was discovered on April 2, 1994 (UT). UBVRI CCD photometry of SN 1994 I were obtained for the period of the first two months from April 4, 1994, using the Seoul National University Observatory 60 cm telescope. The light curves of SN 19941 show several interesting features: (a) SN 19941 reaches the maximum brightness at B-band on April 8.23 (B = 13.68 mag), at V-band on April 9.10 (V = 12.89 mag), and at I-band on April 10.32 (I = 12.48 mag); (b) The light curves around the maximum brightness are much narrower than those of other types of supernovae; (c) The light curves after the peak decline more steeply than those of other types of supernovae; and (d) The colors get redder from (V-R) ≈ 0.2 mag ((V - I) ≈ 0.3 mag, (B - V) ≈ 0.7 mag) on April 4 to (V-R)≈ 0.6 mag ((V-1) ≈0.9 mag, (B-V) ≈ 1.3 mag) on April 18. Afterwards (V - R) colors get bluer slightly (by ~0.005 mag/day), while (V-I) colors stay almost constant around (V-1) ≈ 1.0 mag. The color at the maximum brightness is (B-V)=0.9 mag, which is ~1 mag redder than the mean color of typical Type la supernovae at the maximum brightness. The light curves of SN 1994I are similar to those of the Type Ie supernova SN 1962L in NGC 1073. Adopting the distance modulus of (m-M)0 = 29.2 mag and the reddening of E(B - V) = 0.45 mag [Iwamoto et al. 1994, preprint for ApJ], we derive absolute magnitudes at the maximum brightness of SN 1994I, Mv(max) = -17.7 mag and MB(max) = -17.4 mag. This result shows that SN 1994I was ~2 mag fainter at the maximum brightness compared with typical Type Ia supernovae. A narrower peak and faster decline after the maximum in the light curve of SN 1994I compared with other types of supernovae indicate that the progenitor of SN 1994I might be a lower mass star compared with those of other types of supernovae.

Measures of radiographic pelvic and spinal parameters of sagittal balance analysis have become of considerable importance for reconstructive surgery of the spine, particularly in cases of degenerative spondylolisthesis. The authors conducted a retrospective study of clinical outcomes and a radiological review on 231 patients with one or two level degenerative spondylolisthesis. First, patients were classified using preoperative pelvic parameters and evaluations were conducted using mean values of pre- and postoperative spinopelvic parameters. Second, patients were divided into two study groups, that is, Group A (n=105; exhibited no improvement (increase or no change) in pelvic tilt postoperatively) and Group B (n=126; exhibited pelvic tilt improvement (decrease) postoperatively). Clinical outcomes in the two groups were compared using Visual Analogue Pain Scores (VAS) and Oswestry disability index (ODI). All preoperative pelvic parameters show restoration tendency after PLIF surgery for spondylolisthesis, and greater deviations of preoperative pelvic parameters from normality showed greater recovery postoperatively. VAS and ODI improvements at follow-up were poorer in group A than in group B.

Globally, as well as domestically, patients without risk factors for spontaneous spinal epidural hematoma (SSEH) have rarely been reported. SSEH often results from trauma, epidural catheter insertion for anesthesia and invasive spinal procedures. It could also occur in patients with risk factors such as hypertension, coagulopathy, pregnancy, and vascular anomaly. We encountered a case of a 51-year-old female without prior medical history or any risk factors. Magnetic resonance imaging (MRI) showed subacute SSEH at lumbar spine regions. The patient was treated successfully by surgical decompression. Therefore, we report this case with a review of the relevant literature.