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All Journal Bioscientia Medicina : Journal of Biomedicine and Translational Research Bioscientia Medicina : Journal of Biomedicine and Translational Research
A Hussein S Kartamihardja
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Biochemistry, Genetics & Molecular Biology Immunology & microbiology Medicine & Pharmacology Neuroscience

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The FAPI-FDG Mismatch: Unmasking an Occult Pancreatic Lesion via Fibroblast Activation Imaging Amidst Negative Glucose Metabolism and Morphological Findings Nur Rohmat Maulana Saepudin; Hendra Budiawan; Arifudin Achmad; Trias Nugrahadi; A Hussein S Kartamihardja
Bioscientia Medicina : Journal of Biomedicine and Translational Research Vol. 10 No. 4 (2025): Bioscientia Medicina: Journal of Biomedicine & Translational Research
Publisher : HM Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37275/bsm.v10i4.1548

Abstract

Background: Fibroblast activation protein inhibitor (FAPI) positron emission tomography (PET) has emerged as a promising modality for imaging the tumor microenvironment, specifically targeting cancer-associated fibroblasts (CAFs). While 18F-FDG targets glucose metabolism, 68Ga-FAPI targets stromal activation. Discrepancies between these modalities can offer unique insights into early pathogenesis. We report a rare case of incidental focal pancreatic uptake on 68Ga-FAPI PET/CT in a patient with prostate cancer, occurring in the absence of metabolic activity on 18F-FDG PET/CT or anatomical abnormalities on contrast-enhanced CT. Case presentation: A 75-year-old male with a history of acinar adenocarcinoma of the prostate (Gleason 7, post-TURP) underwent multimodal staging to evaluate for metastasis. 68Ga-PSMA PET/CT showed intermediate uptake in the prostate but no distant metastasis. Subsequent 68Ga-FAPI-04 PET/CT revealed a striking, intense focal uptake in the pancreatic body. Conversely, follow-up 18F-FDG PET/CT demonstrated physiological background uptake in the pancreas, and abdominal CT showed no pancreatic mass. Laboratory results indicated a slightly elevated CA 19-9 (45.6 U/mL). The findings present a diagnostic dilemma between early stromal-rich malignancy and focal inflammatory processes. Conclusion: This case highlights the FAPI-FDG Mismatch, suggesting that stromal remodeling may precede metabolic reprogramming and morphological changes in pancreatic lesions. 68Ga-FAPI PET/CT demonstrates superior sensitivity for detecting occult stromal activity, necessitating new diagnostic algorithms for incidentalomas in the era of stromal imaging.
Metabolic Dysfunction Precedes Dopaminergic Loss in Early MSA-C: A Discordant 18F-FDG PET and 99mTc-TRODAT-1 Case Study Arvian Muhammad Barid; Kharisma Perdani; Trias Nugrahadi; A Hussein S Kartamihardja
Bioscientia Medicina : Journal of Biomedicine and Translational Research Vol. 10 No. 4 (2025): Bioscientia Medicina: Journal of Biomedicine & Translational Research
Publisher : HM Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37275/bsm.v10i4.1551

Abstract

Background: Differentiating early-stage multiple system atrophy-cerebellar type (MSA-C) from other ataxia syndromes presents a significant diagnostic challenge. While striatal dopaminergic denervation is a hallmark of synucleinopathies, it may be absent in the early stages of the cerebellar subtype. This study investigates the temporal dissociation between metabolic and dopaminergic biomarkers. Case Presentation: We report a 48-year-old male presenting with a 5-year history of progressive cerebellar ataxia and mild Parkinsonism, resistant to dopaminergic therapy. Written informed consent was obtained from the patient for the publication of this case details and images. To exclude mimics, a basic metabolic workup and High-resolution 3T MRI were performed. MRI revealed mild cerebellar atrophy but lacked the specific hot cross bun sign. Wilson’s disease screening was negative. Due to limited resources, advanced genetic panels for spinocerebellar ataxias were not performed. The patient underwent dual-modality molecular imaging. On Day 1, 18F-FDG PET/CT demonstrated profound hypometabolism in the cerebellum (Cerebellum/Whole-Brain SUVr: 0.68) and pons (SUVr: 0.72). Conversely, on Day 30, 99mTc-TRODAT-1 SPECT revealed robust, symmetrical striatal uptake with Specific Binding Ratios (SBR) of 1.15 (Right) and 1.12 (Left), indicating preserved presynaptic dopamine transporter density. Conclusion: This case illustrates a critical temporal dissociation in MSA-C pathophysiology: widespread pontocerebellar metabolic failure occurs prior to structural nigrostriatal degeneration. Clinicians must recognize that a normal DAT scan does not exclude MSA-C. In limited-resource settings where genetic testing is unavailable, 18F-FDG PET offers superior sensitivity in the early diagnostic window to support the diagnosis.
The FAPI-FDG Mismatch: Unmasking an Occult Pancreatic Lesion via Fibroblast Activation Imaging Amidst Negative Glucose Metabolism and Morphological Findings Nur Rohmat Maulana Saepudin; Hendra Budiawan; Arifudin Achmad; Trias Nugrahadi; A Hussein S Kartamihardja
Bioscientia Medicina : Journal of Biomedicine and Translational Research Vol. 10 No. 4 (2025): Bioscientia Medicina: Journal of Biomedicine & Translational Research
Publisher : HM Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37275/bsm.v10i4.1548

Abstract

Background: Fibroblast activation protein inhibitor (FAPI) positron emission tomography (PET) has emerged as a promising modality for imaging the tumor microenvironment, specifically targeting cancer-associated fibroblasts (CAFs). While 18F-FDG targets glucose metabolism, 68Ga-FAPI targets stromal activation. Discrepancies between these modalities can offer unique insights into early pathogenesis. We report a rare case of incidental focal pancreatic uptake on 68Ga-FAPI PET/CT in a patient with prostate cancer, occurring in the absence of metabolic activity on 18F-FDG PET/CT or anatomical abnormalities on contrast-enhanced CT. Case presentation: A 75-year-old male with a history of acinar adenocarcinoma of the prostate (Gleason 7, post-TURP) underwent multimodal staging to evaluate for metastasis. 68Ga-PSMA PET/CT showed intermediate uptake in the prostate but no distant metastasis. Subsequent 68Ga-FAPI-04 PET/CT revealed a striking, intense focal uptake in the pancreatic body. Conversely, follow-up 18F-FDG PET/CT demonstrated physiological background uptake in the pancreas, and abdominal CT showed no pancreatic mass. Laboratory results indicated a slightly elevated CA 19-9 (45.6 U/mL). The findings present a diagnostic dilemma between early stromal-rich malignancy and focal inflammatory processes. Conclusion: This case highlights the FAPI-FDG Mismatch, suggesting that stromal remodeling may precede metabolic reprogramming and morphological changes in pancreatic lesions. 68Ga-FAPI PET/CT demonstrates superior sensitivity for detecting occult stromal activity, necessitating new diagnostic algorithms for incidentalomas in the era of stromal imaging.
Metabolic Dysfunction Precedes Dopaminergic Loss in Early MSA-C: A Discordant 18F-FDG PET and 99mTc-TRODAT-1 Case Study Arvian Muhammad Barid; Kharisma Perdani; Trias Nugrahadi; A Hussein S Kartamihardja
Bioscientia Medicina : Journal of Biomedicine and Translational Research Vol. 10 No. 4 (2025): Bioscientia Medicina: Journal of Biomedicine & Translational Research
Publisher : HM Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37275/bsm.v10i4.1551

Abstract

Background: Differentiating early-stage multiple system atrophy-cerebellar type (MSA-C) from other ataxia syndromes presents a significant diagnostic challenge. While striatal dopaminergic denervation is a hallmark of synucleinopathies, it may be absent in the early stages of the cerebellar subtype. This study investigates the temporal dissociation between metabolic and dopaminergic biomarkers. Case Presentation: We report a 48-year-old male presenting with a 5-year history of progressive cerebellar ataxia and mild Parkinsonism, resistant to dopaminergic therapy. Written informed consent was obtained from the patient for the publication of this case details and images. To exclude mimics, a basic metabolic workup and High-resolution 3T MRI were performed. MRI revealed mild cerebellar atrophy but lacked the specific hot cross bun sign. Wilson’s disease screening was negative. Due to limited resources, advanced genetic panels for spinocerebellar ataxias were not performed. The patient underwent dual-modality molecular imaging. On Day 1, 18F-FDG PET/CT demonstrated profound hypometabolism in the cerebellum (Cerebellum/Whole-Brain SUVr: 0.68) and pons (SUVr: 0.72). Conversely, on Day 30, 99mTc-TRODAT-1 SPECT revealed robust, symmetrical striatal uptake with Specific Binding Ratios (SBR) of 1.15 (Right) and 1.12 (Left), indicating preserved presynaptic dopamine transporter density. Conclusion: This case illustrates a critical temporal dissociation in MSA-C pathophysiology: widespread pontocerebellar metabolic failure occurs prior to structural nigrostriatal degeneration. Clinicians must recognize that a normal DAT scan does not exclude MSA-C. In limited-resource settings where genetic testing is unavailable, 18F-FDG PET offers superior sensitivity in the early diagnostic window to support the diagnosis.
Co-Authors Arifudin Achmad Arvian Muhammad Barid Hendra Budiawan Kharisma Perdani Nur Rohmat Maulana Saepudin Trias Nugrahadi