Diagnostic accuracy of bone scan at different PSA levels in biochemical recurrence of prostate cancer.

OBJECTIVE: To determine the diagnostic accuracy of Bone Scan at different PSA levels for detecting skeletal metastases in men with biochemical recurrence of prostate cancer. METHODS: We conducted a retrospective review of the statewide RIS-PACS to identify 251 men with biochemical recurrence who underwent both a Bone Scan and Ga68 PSMA PET/CT (within 2 months of each other) between September 2019 and December 2022 at a single institution. The Ga68 PSMA PET/CT report was considered to be the reference standard. RESULTS: The median age was 72 years (IQR 67-76) with a median PSA level of 1 ng/ml (IQR 0.25-2.8). Using Ga68 PSMA PET/CT as the reference standard, 68/251 patients (25%) were positive for osseus metastases. Overall sensitivity and specificity of Bone Scan was 51% (95% CI 40-64%) and 99% (95% CI 98-100%) respectively. Using PSA banding, a PSA threshold of 20 ng/ml provided the greatest discriminatory benefit with sensitivity of the Bone Scan below the threshold being 46% (95% CI 33-59%) and above the threshold being 89% (95% CI 68-100%). Specificity remained consistently high both below and above this threshold. CONCLUSION: Bone Scan provides greater diagnostic accuracy for detecting skeletal metastases in biochemical recurrence when the PSA level is above 20 ng/ml. This knowledge is valuable in optimising imaging algorithms in biochemical recurrence, particularly in regions where PSMA PET/CT is less readily available or affordable.

Pachymeningitis Demonstrated on Gallium SPECT/CT Scan.

A 34-year-old woman presented with a 3-month history of right-sided headaches associated with photophobia and pulsatile tinnitus. Investigations including lumbar puncture revealed elevated opening CSF pressure, increased protein, and presence of monocytosis consistent with an inflammatory/infective process. Brain MRI showed an area of thickened enhancing dura around the venous sinus posteriorly. Ga scintigraphy demonstrated focal intracranial uptake in the posterior occipital region, and biopsy confirmed a chronic inflammatory infiltrate with no granulomas.

Fasting target for hyperglycaemia in pregnancy.

Knowledge of the fasting plasma glucose of healthy women may assist in the setting of treatment targets for women with hyperglycaemia in pregnancy (HIP). This study examines the pregnancy glucose tolerance test results of 3344 women without HIP collected over a three-year period. The median fasting plasma glucose was 4.4 mmol/L with an interquartile range of 4.2-4.6 mmol/L and a 5th to 95th centile of 3.8-4.9 mmol/L. As the diagnostic fasting glucose level for HIP is ≥5.1 mmol/L, these data support a treatment target of ≤5.0 mmol/L.

Seasonal Changes in the Prevalence of Gestational Diabetes Mellitus.

OBJECTIVE: To determine the effect of different seasons on the prevalence of gestational diabetes mellitus (GDM) by using World Health Organization criteria. RESEARCH DESIGN AND METHODS: The results of all pregnancy glucose tolerance tests (GTTs) were prospectively collected over a 3-year period in a temperate climate, and the results were grouped by season. RESULTS: The results of 7,369 pregnancy GTTs were available for consideration. In winter, the median 1-h and 2-h glucose results after GTT were significantly (P < 0.0001) lower than the overall 1-h and 2-h results. The prevalence of GDM at the 1-h diagnostic level was 29% higher in summer and 27% lower in winter than the overall prevalence (P = 0.02). The prevalence of GDM at the 2-h diagnostic level was 28% higher in summer and 31% lower in winter than the overall prevalence (P = 0.01). CONCLUSIONS: The prevalence of GDM varies according to seasons, which leads to the possible overdiagnosis of GDM in summer and/or underdiagnosis in winter. Further research into standardization of the GTT or seasonal adjustment of the results may need to be considered.

The prevalence of hyperglycaemia in pregnancy in Australia.

BACKGROUND: The Australasian Diabetes in Pregnancy Society (ADIPS) has recently endorsed the World Health Organization (WHO) terminology and classification of hyperglycaemia in pregnancy. The prevalence is likely to increase, but no prospective data are available for a representative Australian population. AIMS: To determine the prevalence of hyperglycaemia in pregnancy (HIP) using results from both the public and private sectors in a population that has a similar ethnicity to the overall Australian population. MATERIAL AND METHODS: The results of all pregnancy oral glucose tolerance tests (POGTT) in the public sector and by a dominant private pathology provider in a major city have been prospectively collected for a three-year period and analysed using the ADIPS (WHO) criteria. RESULTS: The prevalence of hyperglycaemia in pregnancy (HIP) was 13.1% with diabetes mellitus in pregnancy (DIP) being 0.4% and gestational diabetes mellitus (GDM) being 12.7%. CONCLUSION: The new criteria will diagnose about one-third more women with GDM than the previous ADIPS criteria. This will have resource and health implications. Focussed local health economic data will be important.