Traumatic Cervical Epidural Hematoma without Osseous Fracture Presenting as Hemiparesis / 대한신경손상학회지

Traumatic cervical epidural hematoma (EDH) with no osseous fracture or underlying hematological abnormalities is a rare disorder that sometimes requires emergent surgical decompressive therapy. A 47-year-old woman was admitted to our emergency room due to severe neck pain and rapid onset hemiparesis after a car accident. Plain cervical radiographs and computed tomography scan did not reveal any abnormality. However, magnetic resonance imaging (MRI) revealed a large posterior EDH compressing the spinal cord extensively from C3 to C5. Emergent hematoma removal was performed following laminectomy, and subsequently the patient showed substantial clinical improvement. Complete removal of the hematoma was confirmed by MRI at 10 days after surgery. Here, the authors present a discussion of the etiology, pathogenesis, and prognosis of this rare pathologic entity.

Epidemiologic Characteristics of Intentional Poisoning: Emergency Department Based Injury in-depth Surveillance During 2011–2015

PURPOSE: The purpose of this study was to investigate the epidemiologic characteristics of patients who visited emergency departments (EDs) after intentional poisoning in Korea. METHODS: This study retrospectively analyzed the data of of 23 hospitals during a five-year period, between 2011 and 2015. We included patients who inflicted injury to themselves - attempt of suicide - by means of poisoning. RESULTS: A total of 18,121 patients visited an ED after intentional poisoning. Among them, 58.3% were females; however, there were more males among those aged 60 years or older. The mortality rate for males was 8.6%, which was 3.1 times higher than that for females with 2.8%. The most common poison was pesticides (35.4%) in males and sedative-hypnotics (44.0%) in females. The most common causative agent of death was pesticide in both sexes (75.2% and 65.3%, respectively). Since the production of paraquat was discontinued in 2011, the number of deaths from pesticide poisoning has decreased. The mortality rate declined in both males and females, from 12.6% and 4.5% in 2011 to 7.1% and 2.1% in 2015, respectively. CONCLUSION: In this study, we analyzed the epidemiologic characteristics of intentional poisoning, especially the frequency of suicide attempts by gender and age group, the cause of suicide, and the causative agent. This can be used as basic data for establishing policies to reduce and prevent suicide attempts by poisoning.

Influence of Climate Factors and PM10 on Rotaviral Infection: A Seasonal Variation Study / 대한소아소화기영양학회지

PURPOSE: Recently, while the authors were experiencing that the epidemic period of rotaviral infection happened more in the early spring, we tried to find out how the outbreaks of rotaviral infection are changing in detail depending on the weather condition since it has something to do with the climate factors and PM10. METHODS: Fourteen hundreds seventy nine patients who were proved to be positive to rotavirus were chosen among children less than 5 years old from January 1995 to June 2003. Among various climate factors, monthly average temperature, humidity, rainfall and PM10 were selected. RESULTS: Rotaviral infection was most active in 2002 as 309 (20.9%) patients. It has been the spring that is the most active period of rotaviral infection since 2000. The temperature (RR=0.9423, CI= 0.933424~0.951163), rainfall (RR=1.0024, CI=1.001523~1.003228) and PM10 (RR=1.0123, CI= 1.009385~1.015248) were significantly associated with the monthly distribution of rotaviral infection. CONCLUSION: Through this study we determined that the epidemic period of rotaviral infection is changed to spring, which is different from the usual seasonal periods such as late fall or winter as reported in previous articles. As increased PM10 which could give serious influence to the human body, and changing pattern of climate factors such as monthly average temperature and rainfall have something to do with the rotaviral infection, we suppose that further study concerning this result is required in the aspects of epidemiology, biology and atmospheric science.

Meralgia Paresthetica by Iliopsoas Bursa associated with Osteonecrosis of the Femoral Head: A Case Report / 대한정형외과학회잡지

We present a patient with meralgia paresthetica by a distended iliopsoas bursa and associated with concurrent osteonecrosis of the femoral head. This manifestation is unusual and extremely rare because classically LFCN dose not pass near the iliopsoas bursa. We presume a mechanism of nerve injury by variation of the course of lateral femoral cutaneous nerve.

Colon Perforation during Air Enema Reduction of Intussusception

PURPOSE: Although air enema reduction has been known as a good method of diagnosis and treatment of intussusception, it could develop colon perforation. However, there have been few studies about this complication. So we analyzed the risk factors of colon perforation during air enema reduction in patients with intussusception. METHODS: We reviewed the charts of 12 colon perforation patients during air enema reduction of intussusception, who were admitted to Gil Medical Center from Jan. 1990 to Dec. 2001. Their age, sex, major symptoms, length of time till hospital visit, types of intussusception, operative findings and pathologic reports were reviewed. RESULTS: Among 657 cases, 596 patients(90.7%) were successfully treated, but 12 patients(1.83%) failed in air enema reduction and had colon perforation. In patients with colon perforation the male to female ratio was 11 : 1, and average age was 5.3 months. The most common symptom at the time of hospital visit was vomiting(91.7%). Cyclic irritability(75.0%), bloody stool(75.0%) and abdominal mass(41.7%) were also noted. The average length of time between symptom onset and hospital visit was 44.7 hours. Types of intussusception were predominantly ileocolic, ileocecal, and ileoileocolic. The site of perforation was most commonly found at the proximal part of intussusception including ascending colon(50%) and transverse colon(50%). Most cases were uncomplicated, and had a single perforation. Pathologic reports showed hemorrhagic necrosis and mesenteric laceration at the site of colon perforation. Complications of colon perforation were tension pneumoperitonium(58.3%), requiring immediate decompression. CONCLUSION: The chance of colon perforation during air enema reduction increases in cases with small bowel obstruction on simple abdominal x-ray of a patient younger than 6 months, delay in time till hospital visit and higher air pressure during reduction. Therefore more careful investigation is needed in these cases.

Arthrosonography of the Shoulder Joint for Evaluation of the Glenoid Labrum, Glenoid Rim and Humeral Head: Comparison with Conventional Ultrasonography and MR Arthrography

PURPOSE: To compare the diagnostic role of arthrosonography, conventional ultrasonography and MR arthrography in the assessment of glenoid labral tear, glenoid rim fracture and humeral head fracture of the shoulder joint. MATERIALS AND METHODS: The findings of arthrosonography, conventional ultrasonography and MR arthrography were prospectively evaluated in 62 consecutive patients with chronic pain or a history of recurrent dislocation of the shoulder joint. The glenoid labrum was arbitrarily divided into four quadrants: anterosuperior, anteroinferior, posterosuperior, and posteroinferior, and for each, visibility at arthrosonography and conventional ultrasonography was subjectively scored as one of four grades. By means of statistical analysis, the two techniques were then compared. Twenty-six patients subsequently underwent arthroscopy, and the presence or absence of labral tear, glenoid rim fracture and humeral head fracture was determined. The sensitivity and specificity of each modality were separately calculated for each of the three types of shoulder joint injury, and observed differences in these findings were statistically analysed. RESULTS: For all individual quadrants of the labrum, visibility at arthrosonography was higher than at conventional ultrasonography (p.05), though its specificity was significantly higher (p=.003). In this respect, there was no significant difference in sensitivity or specificity between arthrosonography and MR arthrography (p>.05). For the detection of glenoid rim and humeral head fracture, there were no statistical differences in sensitivity and specificity between the three imaging modalities (p> .05). CONCLUSION: Compared with conventional ultrasonography, arthrosonography provides higher visibility of the labrum, thus improving the capacity of ultrasonography to detect labral tear. Arthrosonography could therefore be useful in the diagnosis of labral tear, glenoid rim fracture and humeral head fracture, and may thus partially replace MR arthrography.

Transcatheter Closure of Atrial Septal Defect Using Amplatzer Septal Occluder

BACKGROUND AND OBJECTIVES: Transcatheter occlusion (TCO) may be an alternative method for the surgical closure of a secundum atrial septal defect (ASD) below 20 mm in diameter. We performed this study in order to evaluate the safety and feasibility of an Amplatzer septal occluder for closing ASD bigger than 20 mm in diameter percutaneously. SUBJECTS AND METHODS: Thirty three of 39 patients presenting with ASD were included in this study (3 patients with a large defect over 32mm and 3 with multiple defects were excluded). The median age was 8.6 years (2.2 - 54) and median weight was 27 kg (10.7 - 85). The mean defect size was 15+/-3 mm as measured by transthoracic echocardiogram, 17+/-5 mm by transesophageal echocardiogram, and 21+/-6 (11 - 32) mm by balloon stretched diameter. The balloon stretched diameter was larger than 20 mm in 20 of 33 patients. The mean Qp/Qs was 2.3+/-0.7. The mean device size was 22+/-6 mm and the mean fluoroscopic time was 13+/-7 min. RESULTS: The device was successfully implanted in 29 of 33 patients. The 4 patients in which implantation failed showed a left disc protrusion into the right atrium. Three of these patients were treated surgically, and one underwent a successful second attempt of TCO 12 months after the first trial. Complete closure was obtained in 30 patients in follow-up. The complications encountered included;cobra-shaped deformity of the device (3), transient AV block (Wenckebach) (1), embolization of the radioopaque marker into the left atrial appendage (1), failure in the first device (1), and mild mitral regurgitation at 3 months follow-up due to device protrusion into the mitral valve (1). CONCLUSION: The Amplatzer septal occluder appears to be a promising device for TCO of ASD up to 32 mm in diameter, however, long-term follow-up in a large number of patients is warranted.

Two Cases of Rotor Syndrome in Siblings / 대한소아소화기영양학회지

We experienced two cases of Rotor syndrome in brothers who were a 13 year-old boy and an 11 year-old boy, respectively. They presented with icteric scleras for a few months. Their common laboratory characteristics were as follows: Direct bilirubin was more increased than indirect bilirubin, but aminotransferases were normal. Plasma indocyanine green (ICG) test revealed hepatic excretory defect: plasma ICG concentrations 15 minutes after intravenous injection were 80.45% and 78.28%, respectively. 99mTc-DISIDA Hepatobiliary scan showed that severely decreased hepatic extraction with mild cardiac blood pool, markedly delayed biliary excretion in both intra- & extra- hepatic bile ducts, delayed visualization of gall bladder, and markedly delayed intestinal biliary passage. Needle liver biopsy showed normal hepatic histology without pigmentation.

A Case of Congenital Nasal Pyriform Aperture Stenosis

The cause of congenital nasal pyriform aperture stenosis is unclear. The development of the facial skeleton occurs between the fifth and the eighth week of gestation. It is at this stage that the stenosis occurs due to overgrowth of the ossification of the maxilla. Infants are obligate nasal breathers. Incomplete and milder forms of nasal airway obstruction may be present with mild respiratory distress, cyanosis, respiratory failure, asphyxia and eventual death. The diagnosis is done by CT, which demonstrates marked narrowing of the nasal inlet. Mild stenosis can be managed conservatively with humidification and topical decongestants but if conservative treatment fails, surgical intervention is candidate. We report a case of congenital nasal pyriform aperture stenosis. The patient, a 2-day old male neonate, had cyanosis during feeding and noisy breathing relieved by crying. His symptoms and signs were improved with surgical intervention without development disturbances.

Use of Preoperative Duplex Scan for Hemodialysis Fistula Operations: Early Results

PURPOSE: We assumed preoperative duplex examination may be helpful for determination of the site of hemodialysis fistula operation and result in decreased early failures. METHOD: From January 1999 through October 1999, 25 operations were performed in 23 patients (historical control, Group I). From November 1999 through June 2000, 30 operations were performed in 29 patients (Group II). During the latter period, preoperative duplex examination was selectively introduced for patients whose forearm veins were not prominent or who were suspected to have stenosis or obstruction of outflow. Forearm veins with a diameter more than 2.5 mm were sought and their continuity up to the elbow level was confirmed. When an adequate forearm vein was not detectable, veins on antecubital area with the diameter more than 4 mm was sought for graft fistula (GF). RESULT: Group I consisted of 24 autogenous fistulas (AF) and 1 GF, and group II consisted of 26 AF and 4 GF. Among the group II patients, 19 preoperative duplex examinations were done (18 patients). The mean diameter of forearm veins used for AF were 3.27mm (0.69 SD). Diameter of veins used for GF ranged from 3.7 to 6.0 mm. Early failure rate in group I was 16% (4/25), whereas it was 6.7% in group II (2/30). The two failures in group II were associated with sclerotic veins on physical examination. CONCLUSION: Our early results show that preoperative duplex scan may decrease early failure rate of fistula operation. Findings of duplex scan combined with avoidance of sclerotic veins on physical examination may significantly decrease the rate of early failure.

Two Cases of Infantile Hemangioendothelioma of the Liver in Neonates

Infantile hemangioendothelioma(IHE) of the liver is a rare benign vascular tumor that presents most commonly in infants before the age of 6 months. IHE presents as abdominal mass, cutaneous hemangiomas, unexplained jaundice, bleeding disorders, or congestive heart failure. Death often results from congestive heart failure despite appropriate treatment with digoxin and diuretics. IHE also is associated with Kasabach-Merritt syndrome, anemia, intraperitoneal hemorrhage secondary to rupture, consumptive coagulopathy and vascular malformation involving brain, skin, gut, and other organs. Although children with asymptomatic lesions may experience spontaneous regression within a year, symptomatic lesions shoud be treated aggressively because this disease can progress rapidly and may be fatal. Treatment options are divided into medical treatment, interventional therapy including embolization, and surgical resection. Corticosteroid may hasten involution by inhibiting proliferation of endothelial and smooth muscle cells, and this trial is warranted in most cases before invasive procedures are used. If steroid therapy is unsuccessful, early definitive treatment using embolization or ligation of the hepatic artery, resectional surgery, and orthotopic liver transplantation shoud be considered. We experienced symptomatic IHE in two neonates. In the first case, she showed respiratory failure and consumptive coagulopathy, and symptoms were aggravated despite steroid therapy, so a left lobectomy was performed. In the second case, he presented high output cardiac failure, and was successfully treated by the coil embolization of left hepatic artery. This coil embolization of hepatic artery for treating IHE was the first case in Korea we know of.

Influence of Epstin-Barr Virus Infection in Immune Thrombocytopenic Purpura in Childhood / 대한소아혈액종양학회지

PURPOSE: Acute immume thrombocytopenic purpura (ITP) is relatively common hematologic disease in children. Most acute ITP is recovered within 6 month spontaneously and the complication is rare. But 10~20% of the ITP patient became a chronic form. Infection with Epstein-Barr virus (EB virus) in developing country usually occurs during infancy and early childhood. Acute ITP associated with EB virus is likely to develop chronic ITP in current literatures. We studied the pattern of laboratory findings in long term follow up of ITP with EB virus infection. METHODS: One hundred and seventy nine patients diagnosed with ITP admitted to the division of pediatric hematology, Gachon Medical Center and Hanyang University Hospital between Mar. 1991 and Jun. 2001 were reviewed retrospectively. Serologic test for EB virus was available for 57 patients and 25 of them were follow up at least 6 months. Evidence of acute EB virus infection was defined as a positive Viral Capsid Antigen (VCA) IgM or positive Anti VCA IgG and negative Ebstein-Barr virus Nuclear Antigen (EBNA). Complete remission (CR) was defined as a recovery of platelet count of more than 100 109/L and partial remission (PR) as a recovery of platelet count of 50~100 109/L, maintained for at least 6 months. RESULTS: Sixteen out of 57 patients were associated acute EB virus infection. Of this group, 8 patients were follow up at least 6 months. Forty one of 57 with no evidence of acute EB virus infection, 17 were follow up at least 6 months. The clinical and laboratory data was not different significantly in children with and without acute EB virus infection in admission. In EB virus infection group of 6 months follow up, platelet count was significantly lower than control group in 6 months follow up (P=0.006). Five patients of 8 (63%) with acute EB virus infection had chronic ITP and 2 of 17 (12%) with no evidence of EB virus infection had chronic ITP in follow up 6 months. CONCLUSION: Patients with EB virus associated ITP tended to resolved more slowly than those without EB virus infection and also showed tendency to become chronic ITP.

MR Imaging of Soft-Tissue Vascular Lesions: Pathologic Correlation

In the evaluation of vascular lesions, MR can be used to distinguish slow- from high-flow lesions on the basis of the observed spin-echo MR signal characteristics. MR imaging can also represent features of the static tissues of the vascular lesions that are composed of fibrofatty components, as well as thromboses, phleboliths and muscle atrophy. This paper illustrates the MR findings of various vascular lesions, correlating them with the pathologic specimen and emphasizing on the static tissues.

Comparison of Brainstem Auditory Evoked Response in Normal Infants, Male and Female, Right and Left Ear

PURPOSE: Brainstem auditory evoked response(BAER) is used as screening test for hearing disorders, damages of the central nervous system and congenital anomalies. We studied the difference values according to gender and stimulation sites in normal full-term infants. METHODS: We performed BAER in 38 male and 28 female normal full-term infants, delivered in the Gil Medical Center, Gachen Medical School, from March to July 1996, aged one to seven days. Amplitude I, V, V/I and latency I, III, V and interpeak latency(IPL) I-III, III-V, I-V were measured at 90, 60, 45, 30 dB. Data were analyzed between both sex and between both ears with Student t-test. RESULTS: There were no significant difference in male and female group with the same side's stimulation. At 90 dB, amplitude I of left ear stimulation was significantly higher than right in male and female. Amplitude V/I of right ear stimulation was significantly higher than left ear stimulation in total only. At 90 dB, latency I of right was significantly longer than left in male and female. Latency III of right was longer significantly in total only. IPL I-III, I-V was significantly longer in left than right in male and total. At 60 dB intensity, all data except latency I in total, showed no significant difference. CONCLUSIONS: Interpreting BAER, stimulation site and intensity should be considered. and further studies will be needed for the evaluation of the difference between left and right ear.

Incontinentia Pigmenti in a Mother and her Daughter

Incontinentia pigmenti (IP) is a rare multisystemic ectodermal disorder, which is characterized by vesicular, verrucous, and pigmented cutaneous lesions, and is frequently associated with various developmental defects of the eye, CNS, teeth, hair, and nail. It is regarded as an X-linked dominant genetic disorder. We recently experienced a case with IP, who presented with irregular, reticular, and slate-gray to brown colored pigmentation on the whole body at birth. Skin lesions were much improved by 6 month of age. The mother of this infant had the history of same cutaneous lesions in her neonatal period, suggesting that these lesions had familial tendency.

MR Imaging of Medullary Streaks in Osteosclerosis: A Case Report

We present a case of medullary sclerosis of the appendicular skeleton in a patient with chronic renal insufficiency for whom MR imaging findings were char-acteristic. T1- and T2-weighted MR images showed multiple vertical lines (medullary streaks) of low signal intensity in the metaphyses and diaphyses of the distal femur and proximal tibia.

The Clinical Significance of Epitrochlear Lymphadenopathy on Elbow Radiographs in Rheumatoid Arthritis

PURPOSE: To evaluate the radiographic findings of epitrochlear lymphadenopathy with regard to the distribution and severity of the disease and clinal parameters in patients with rheumatoid arthritis. MATERIALS AND METHODS: Forty six patients with rheumatoid arthritis in whom epitrochlear oval-shaped densi-ties were seen on radiographs were involved in this study. There were 14 cases of unilateral epitrochlear lym-phadenopathy in which bilateral arthritic evidence was revealed by radiographs (mixed group), and 32 of bilat-eral lymphadenopathy in which there was arthritic evidence (positive group). Twenty-three patients in whom lymphadenopathy was not seen on radiographs of the elbow and who were diagnosed as suffering from rheumatoid arthritis functioned as controls (negative group). For scoring the degree of arthritis using the sim-plified scoring method proposed by Kaye et al., joints were divided into six groups, as follows: Joint 1, elbow; Joint 2, wrist; Joint 3, radial (1st and 2nd) PIP and MCP; Joint 4, ulnar (3rd, 4th, 5th) PIP and MCP; Joint 5, Joints 1+2+3+4; Joint 6, Joints 1+4. For each joint, scores were compared with those on the contralateral side in the mixed group. Differences in clinical parameters (disease duration, rheumatoid factor, ESR, and CRP), and scores for each joint in each arm were statistically compared between be positive and negative group. The number, mean diameter, and maximal diameter of epitrochlear lymph nodes were calculated and correlated with clinical parameters and scores for each joint. To evaluate the incidence of epitrochlear lym-phadenopathy without radiographic evidence of arthritis in 46 patients (78 arms) with lymphadenopathy, the frequency of cases in which the score for the joint was zero was assessed. RESULTS: In the mixed group, the mean score for Joint 6 of the arm with epitrochlear lymphadenopathy was significantly higher than that for the contralateral side in the mixed group (p = 0.022). Only CRP was signifi-cantly higher in the positive group than in the negative (p = 0.02). At joints 1, 2, 3, 5 and 6 of the left arm, and at joints 1, 4, 5 and 6 of the right arm, the mean score for each joint was significantly higher in the positive group than in the negative. Among 78 arms in which radiographs revealed epitrochlear lymphadenopathy, the score was zero for all joints in nine cases (11.6%). CONCLUSION: In patients with rheumatoid arthritis, evidence of epitrochlear lymphadenopathy, as seen on radi-ographs of the elbow, appears to be related to the distribution and severity of the disease and to CRP levels.

A Case of Saldino-Noonan Type Short Rib-Polydactyly Syndrome

Short rib-polydactyly syndrome (SRPS) is a rare type of skeletal dysplasia characterized by short limb dysplasia, thoracic hypoplasia, polydactyly and multiple visceral anomalies. It is transmitted as a autosomal recessive trait. There have been 4 classic types of SRPS, of which Saldino-Noonan type is the most common, and is characterized by very narrow thorax, short limb, postaxial polydactyly, striking metaphyseal dysplasia of tubular bones, pelvic abnormalities, hypoplasia of iliac bones, flat acetabulae, and abnormalities of urogenital, anorectal and cardiovascular system. We report a newborn infant who had typical features of Saldino-Noonan type SRPS, clinically and radiologically and had compatible autopsy findings.

Differential Diagnosis between Chronic Otitis Media with and Mass Effect

PURPOSE: In order to determine specific differences, we compared the temporal bone CT findings of chronic otitis media(COM) with and without cholesteatoma, focusing on bone change. MATERIALS AND METHODS: Between 1997 and 1998, 82 patients(84 cases) underwent temporal bone CT and were shown to have COM, with or without cholesteatoma after mastoidectomy and tympanoplasty. There were 36cases of COM with cholesteatoma(26 patients, M:F=11:15; age range, 16 -61 [mean, 36.2] years), and 58 cases without cholesteatoma(56 patients, M:F=25:31, age range, 15 -61 [mean, 36.2]years). The findings of temporal bone CT were analyzed at the point of bony changes including erosion and medial displacement of ossicles(malleus, incus, and stapes), erosion or destruction of the scutum, tegmen, facial canal, and lateral semicircular canal, and ballooning of the tympanic cavity and mastoid antrum. In addition, the soft tissue changes seen on temporal bone CT were analyzed at the site of lateral bulging of soft tissue in Prussak's space, perforation of the pars flaccida, tympanic membrane retraction, and tympanosclerosis. We retrospectively compared the findings of temporal bone CT with the surgical findings, and to assess statistical significance, the Chi-square test was used. RESULTS: Bone erosion or destruction was seen in 36.2 % of COM cases without cholesteatoma, and in 96.2% of cases with cholesteatoma. Comparing COM with and without cholesteatoma, the erosion of ossicles includ-ing the malleus(81%, 24%), incus(88%, 14%), stapes(58%, 10%), scutum(88%, 10%), facial canal(8%, 0%), and lateral semicircular canal(8%, 0%), was more common in COM with cholesteatoma(p-value0.05). CONCLUSION: Bone erosion or destruction was seen in COM without cholesteatoma, but expansile bone erosion or destruction with mass effect suggested COM with cholesteatoma. These findings of temporal bone CT in COM demonstrate the existence and extent of combined cholesteatoma, and are therefore valuable.

Differential Diagnosis between Chronic Otitis Media with and Mass Effect

PURPOSE: In order to determine specific differences, we compared the temporal bone CT findings of chronic otitis media(COM) with and without cholesteatoma, focusing on bone change. MATERIALS AND METHODS: Between 1997 and 1998, 82 patients(84 cases) underwent temporal bone CT and were shown to have COM, with or without cholesteatoma after mastoidectomy and tympanoplasty. There were 36cases of COM with cholesteatoma(26 patients, M:F=11:15; age range, 16 -61 [mean, 36.2] years), and 58 cases without cholesteatoma(56 patients, M:F=25:31, age range, 15 -61 [mean, 36.2]years). The findings of temporal bone CT were analyzed at the point of bony changes including erosion and medial displacement of ossicles(malleus, incus, and stapes), erosion or destruction of the scutum, tegmen, facial canal, and lateral semicircular canal, and ballooning of the tympanic cavity and mastoid antrum. In addition, the soft tissue changes seen on temporal bone CT were analyzed at the site of lateral bulging of soft tissue in Prussak's space, perforation of the pars flaccida, tympanic membrane retraction, and tympanosclerosis. We retrospectively compared the findings of temporal bone CT with the surgical findings, and to assess statistical significance, the Chi-square test was used. RESULTS: Bone erosion or destruction was seen in 36.2 % of COM cases without cholesteatoma, and in 96.2% of cases with cholesteatoma. Comparing COM with and without cholesteatoma, the erosion of ossicles includ-ing the malleus(81%, 24%), incus(88%, 14%), stapes(58%, 10%), scutum(88%, 10%), facial canal(8%, 0%), and lateral semicircular canal(8%, 0%), was more common in COM with cholesteatoma(p-value0.05). CONCLUSION: Bone erosion or destruction was seen in COM without cholesteatoma, but expansile bone erosion or destruction with mass effect suggested COM with cholesteatoma. These findings of temporal bone CT in COM demonstrate the existence and extent of combined cholesteatoma, and are therefore valuable.