Accumulation of Tc-99m DTPA in Ewing sarcoma

Thyroid Accumulation of 99m Tc-DTPA in Graves Disease

ABSTRACT

99m Tc-DTPA dynamic renal scintigraphy for evaluating glomerular filtration rate was performed in a 29-year-old woman with hyperuricemia and Graves disease. Subsequently, 99m Tc-DTPA orbital scintigraphy was conducted to determine the activity of Graves ophthalmopathy. Thyroid accumulation of 99m Tc-DTPA was incidentally identified. This should be cautiously distinguished from 99m Tc-pertechnetate uptake, considering that the salivary glands, oral cavity, and stomach were not visualized. Our case demonstrates that augmentation of blood supply, enhancement of capillary permeability, and accumulation of inflammatory exudate may be involved in the pathological process of Graves disease.

Incidental Detection of Ilium Langerhans Cell Histiocytosis on 99m Tc-DTPA Renal Dynamic Scintigraphy

ABSTRACT

We report the case of a 24-year-old man who underwent 99m Tc-DTPA scintigraphy for the evaluation the renal function. This scan incidentally showed an abnormal uptake of 99m Tc-DTPA in the left lower abdominal region. SPECT/CT fusion images showed osteolytic bone destruction in the left ilium associated with soft tissue mass and elevated DTPA uptake. Biopsy pathology of the ilium lesion demonstrated Langerhans cell histiocytosis.

Accumulation of 99mTc-DTPA in Lumbar Tuberculosis

ABSTRACT

A 70-year-old woman with lumbar and renal tuberculosis underwent 99mTc-DTPA renal scintigraphy to evaluate renal function before lumbar lesion resection and nephrectomy. The images incidentally identified a focus of abnormal DTPA activity in the midline of the abdomen, which corresponded to lumbar tuberculosis revealed by CT images. Subsequent pathology after the resection of the lesions was consistent with lumbar and renal tuberculosis.

Incidental Detection of Adrenal Pheochromocytoma on 99mTc-DTPA Renal Dynamic Scintigraphy

A 53-year-old man with a history of primary hypertension for over 8 years underwent Tc-DTPA renal dynamic scintigraphy to evaluate the renal function. The images revealed an unexpected focus of abnormally increased DTPA activity in the region superior to the upper pole of the right kidney. Subsequent MRIs confirmed an adrenal mass. The results of pathological examination and immunohistochemistry after the resection of the lesion were consistent with adrenal pheochromocytoma.

Incidental Detection of Skeletal Metastases on 99mTc-DTPA Renography

We present the case of a 53-year-old man with left hydroureteronephrosis who underwent Tc-DTPA renography for functional assessment of bilateral kidneys. Tc-DTPA renography of the patient showed diffusely increased extrarenal Tc-DTPA uptake in the visualized lumbosacral vertebrae and in the pelvic bones, on the blood flow and functional phase of the renography, which was suggestive of disseminated skeletal disease. Subsequent MRI lumbosacral spine and F-FDG PET/CT revealed extensive skeletal metastases corresponding to the increased extrarenal Tc-DTPA uptake in the lumbosacral vertebrae and the pelvic bones from primary left lung mitotic lesion.

Incidental bone metastases identified by renal dynamic scintigraphy: A case report

INTRODUCTION

The Technetium-99m diethylene triamine pentaacetic acid (Tc-99m DTPA) renal dynamic scintigraphy is widely used to evaluate the split renal function and continuously demonstrate the whole urinary collecting system. Furthermore, the extrarenal uptake of technetium-99m DTPA can provide useful information for the patients.

CASE PRESENTATION

We described a 72-year-old male with a history of flank pain for 8 months and gross hematuria for 3 days. The technetium-99m diethylenetriaminepenta-acetic acid (DTPA) renal dynamic scintigraphy was performed to evaluate the split renal function. Unexpectedly, there were 2 foci of abnormal increased tracer uptake in the midline of the abdomen. The diagnosis of renal cancer was made on the basis of the imaging characteristics on the ultrasonography. The 2 foci with elevated DTPA activity were consistent with bone metastases on the images of computed tomography and magnetic resonance.

CONCLUSION

The bone metastasis is one of the etiologies of the extrarenal uptake of technetium-99m DTPA, especially for the patients with several foci.

Unexpected Detection of Bone Metastases on Renal Dynamic Scintigraphy

A 57-year-old man with renal mass underwent Tc-diethylenetriaminepentaacetic acid renal dynamic scintigraphy for evaluation of renal function. The blood flow phase images demonstrated a focus of abnormal increased tracer uptake in the region of the right lower quadrant. On the functional phase images, the activity became unimpressive gradually. This focus corresponded to an osteolytic lesion in the right ilium on the CT and MR images, which was a typical pattern of bone metastasis.

Uptake of 99mTc-DTPA in Bone Metastases from Renal Cancer

A 67-year-old man with left renal cell carcinoma underwent Tc-DTPA renal scintigraphy to evaluate the kidney function. The images incidentally identified a large focus of abnormal activity in the right pelvic region, which corresponded to the site of metastasis in the right ilium revealed on CT image.