Langerhans' cell histiocytosis with thyroid involvement masquerading as thyroid carcinoma

A 28-year-old woman was admitted to our Hospital with a chief complaint of progressive gingival swelling and loosening of teeth over about a year. According to past history, she had received total thyroidectomy 2 years previously due to thyromegaly. The thyroidectomy specimen was at first interpreted as 'poorly differentiated carcinoma of the thyroid'. One year ago, she began to be aware of gingival swelling and loosening of teeth. A gum biopsy was taken and the pathologic features were similar to her 'thyroid carcinoma'. Subsequent investigations, including immunohistochemical stain, showed the gum was heavily infiltrated with histiocyte-like Langerhans' cells which were positive for S-100 protein. Ultrastructural examination of the cells under electron microscope revealed many typical intra-cytoplasmic Birbeck granules. Langerhans' cell histiocytosis was diagnosed. Langerhans' cell histiocytosis with thyroid involvement is extremely rare and may run a relatively indolent course. Even on a retrospective examination, it may easily be confused with poorly differentiated carcinoma of the thyroid. We suspect that this error may have been made on other occasions and that the occurrence of this condition may be underreported.      

Histidinaemia: a benign metabolic disorder

Histidinaemia is a relatively common inherited metabolic disorder with an incidence similar to phenylketonuria. This paper reports the long term outcome of patients diagnosed by newborn screening in the north west of England. Between 1966 and 1990, 108 infants were diagnosed as having histidinaemia by a regional neonatal screening programme (incidence 1:11,083). A further five children were detected following diagnosis in a sibling. Of the 113, nine were lost to follow up. Infants diagnosed before 1981 (n = 47) were placed on a low histidine diet (225 mg/kg/d) for an average period of 21 months (SD 4.5). All patients were reviewed regularly, Griffiths developmental quotients (DQ) were assessed at 2 and 4 years, and WISC-R intelligence quotients (IQ) at 8, 12, and 18 years. IQ data were converted to standard deviation scores (IQ SDS) to account for increasing IQ norms with time. Neither DQ nor IQ correlated with plasma histidine at diagnosis or with the mean plasma histidine throughout life. Growth was normal in all patients. There was no apparent benefit from a low histidine diet in early childhood. In contrast to other studies, there was no excess of clinical symptoms. On the basis of these findings, histidinaemia is a benign metabolic disorder that does not require treatment.     

Lingual thyroid gland: sonographic appearance

Thyroid dysgenesis is often manifested by a lingual or sublingual location of the thyroid gland. If radionuclide studies are not readily available or are contraindicated, ultrasound (US) may be used to locate the gland. The US appearance of a lingual thyroid gland and the role of US in the evaluation of suspected thyroid dysgenesis are described.     

Quality assessment and assurance in diagnostic imaging. Theoretical and practical considerations and a quality audit of the excretory urogram

Concepts necessary to an understanding of the basics of quality assurance audits are presented. Included are specific examples that bridged theory and practice by applying the protocol to a real-life diagnostic imaging situation. This method meets the present requirements of the Joint Commission of the Accrediation of Hospitals.     

Prekallikrein-Kallikrein conversion rate as a predictor of contrast material catastrophies

An in vitro is described that attempts to detect patients with a potential for adverse systemic reactions to contrast material. This test involves measuring the rate of conversion of prekallikrein to kallikrein under certain standard conditions. In a preliminary retrospective study, the test could be used to identify such patients with a sensitivity of 88%, a specificity of 82%, and a predictive value of 79%.     

Cost comparison of surgery vs organ preservation for laryngeal cancer

OBJECTIVE: To perform a cost minimization analysis of total laryngectomy with postoperative radiotherapy vs induction chemotherapy with subsequent radiotherapy in patients with advanced (stage III or IV) squamous cell carcinoma of the larynx. DESIGN: Decision-analysis model using data from peer-reviewed trials, case series, meta-analyses, and Medicare diagnosis related group reimbursement rates. SETTING AND PATIENTS: A hypothetical cohort of patients with stage III or IV laryngeal cancer. The perspective is that of a health care payer. INTERVENTIONS: The hypothetical patient cohort could receive (1) surgery (total laryngectomy) with postoperative radiotherapy or (2) induction chemotherapy (fluorouracil and cisplatin) with radiotherapy followed by salvage surgery for patients failing to respond to chemotherapy. MAIN OUTCOME MEASURE: Overall difference in direct medical costs in 2003 US dollars between the 2 treatment arms from initiation to completion of treatment. RESULTS: In the baseline analysis, the direct medical costs for the surgical arm were 30,138 US dollars per patient. For the organ preservation arm, the direct medical costs were 33,052 US dollars per patient. The finding that the surgical arm costs were lower was robust to all sensitivity analyses except for the extreme low estimate for the cost of chemotherapy. CONCLUSIONS: Our results suggest that total laryngectomy with postoperative radiotherapy costs nearly 3000 US dollars less than organ preservation treatment for advanced laryngeal cancer. Given that survival appears equivalent between the 2 modalities, cost consideration and patient preference may be important factors in decision making for the treatment of advanced laryngeal cancer.     

Incidence of serious complications after uvulopalatopharyngoplasty

OBJECTIVES: Uvulopalatopharyngoplasty (UPPP) is the most common surgical treatment for obstructive sleep apnea (OSA). Anatomic and physiologic abnormalities associated with OSA can make perioperative management difficult. Only single-site case series provide current estimates of the incidence of perioperative complications, with a pooled crude serious complication rate of 3.5% and a crude mortality rate of 0.4%. The primary objective of this study was to calculate the incidence of perioperative morbidity and mortality in a large, multisite cohort of UPPP patients. STUDY DESIGN: Prospective cohort study of adults undergoing inpatient UPPP with or without other concurrent procedures METHODS: The serious complication and 30-day mortality rates were calculated from the Department of Veterans Affairs (VA) National Surgical Quality Improvement Program database of prospectively collected outcomes of all VA inpatient surgeries nationally 1991 to 2001. Serious complications were defined by 15 specific life-threatening complications. Deaths were captured whether the patient was in the hospital or discharged. RESULTS: Veteran patients (n = 3130) had a mean age of 50 years and were predominantly male (97%). The serious nonfatal complication rate was 1.5% (47/3,130) (95% confidence interval [CI] 1.1%, 1.9%). The 30-day mortality rate was 0.2% (7/3130) (95% CI 0.1%, 0.4%). There was no significant effect of year of surgery or patient age on the risk of serious complication or death. CONCLUSION: The incidence of serious nonfatal complications and 30-day mortality after UPPP are 1.5% and 0.2%, respectively, in a large cohort of UPPP patients at veteran hospitals.     

Prenatal depiction of cystic hygroma using three-dimensional ultrasound

Prenatal diagnosis of fetal cystic hygroma is very important in clinical medicine. In this series, we report our work of detecting cystic hygroma using three-dimensional (3-D) ultrasound (US). We reviewed our computer database of prenatal diagnosis on cystic hygroma in National Cheng Kung University Hospital from May 1995 to June 2000. All the fetuses were initially scanned by a high-resolution, real-time, 2-D US scanner and subsequently by a 3-D US scanner. In total, 23 cases of fetal cystic hygroma were diagnosed in utero. The range of gestational age at prenatal diagnosis by US was between 11 and 24 weeks, and 91% were diagnosed before 21 weeks. Among them, 8 cases (35%) were Turner syndrome (45,X), and 10 cases (43%) were complicated with hydrops fetalis. Although the diagnostic rates by 2-D US and 3-D US were both 100% (23 of 23), notably, 3-D US can provide additional vivid illustrations in 3-D after various modes of reconstruction, but 2-D US cannot. In conclusion, 3-D US may add novel visual depiction of the lesion in 3-D after reconstruction and, thus, assists substantially in prenatal consultation.     

Postradiotherapy surveillance practice for head and neck squamous cell carcinoma—too much for too little?

INTRODUCTION: Limited information is available regarding surveillance patterns after head and neck cancer radiotherapy. We cataloged follow-up for a specified patient cohort treated at three neighboring university, community, and Veterans Administration institutions. METHODS: One hundred fifteen patients were treated with curative intent between 1994-1998 with definitive or postoperative radiotherapy for newly diagnosed squamous cell carcinoma of the oral cavity, oropharynx, larynx, or hypopharynx. One hundred patients had continuous follow-up at their treating institution and were included for analysis. Median follow-up until disease recurrence or censorship was 28.5 months. RESULTS: Median follow-up frequency was 5.7 visits/year and was highly variable. Although visit frequency correlated with disease stage and the presence of high-risk disease features, this association was lost when patients with early recurrences were removed from analysis. Procedure and test utilization closely mirrored visit frequency, resulting in a wide range of estimated yearly charges (0-15,668 dollars/year; median, 1,772 dollars/year). Actuarial 3-year overall survival for the study group was 71%. Eighty-six percent (19 of 22) of potentially salvageable locoregional failures were discovered secondary to symptomatic complaint rather than by test results. Disease failure, whether detected by symptom or testing, predicted for poor survival (22% at 24 months after recurrence). CONCLUSIONS: Postradiotherapy surveillance for head and neck cancer is inconsistently pursued. A proven correlation between intensive follow-up and improved patient survival is lacking. Surveillance directed by patient symptoms should be investigated as an alternative approach.