Clinical Case Study 1
A 55-year-old woman presented to the Emergency Department with acute, severe abdominal pain that had begun earlier that morning. The pain was continuous and predominantly localized in the lower abdomen, without radiation.
She reported two episodes of vomiting and one bowel movement on the day of presentation, with no associated diarrhea. There was no history of fever, dysuria, hematuria, or other urinary symptoms. She described experiencing a similar but self-limiting episode of abdominal pain approximately two months earlier, which had resolved without medical intervention.
The patient had multiple chronic comorbidities, including type 2 diabetes mellitus, ischemic heart disease status post percutaneous coronary intervention, hypertension, dyslipidemia, depression, and overweight. She was a lifelong non-smoker. Her regular medications included insulin, ezetimibe/atorvastatin, acetylsalicylic acid, bisoprolol, and evolocumab. She had a surgical history of a cesarean section and a laparoscopic sleeve gastrectomy.
On clinical examination, the patient was alert but in moderate distress due to pain. She was hemodynamically stable, with no signs of shock. Abdominal examination revealed generalized guarding and central abdominal tenderness, with a firm lower abdomen more pronounced on the right side. Laboratory investigations showed potassium of 3.2 mmol/L, creatinine of 51 µmol/L, urea of 2.7 mmol/L, white blood cell count of 12.9 × 10⁹/L, hemoglobin of 13.4 g/dL, C-reactive protein of 1.5 mg/L, and random blood glucose of 159 mg/dL.
Initial non-contrast CT of the abdomen demonstrated mildly distended, fluid-filled distal ileal loops in the pelvis, measuring up to 2.2 cm, with mild mucosal thickening and associated mesenteric congestion.
These findings raised concern for early vascular compromise or a developing small bowel obstruction. A small volume of pelvic free fluid was also noted (Fig. 1).
Discussion
Small bowel ischemia continues to be one of the most challenging abdominal emergencies to diagnose early. Clinical presentation is often nonspecific, and laboratory markers remain limited in sensitivity. Conventional CT, although essential, frequently lacks sensitivity in early stages, as typical hallmarks such as pneumatosis and portal venous gas appear late. [1]
PCCT provides significant advantages in this setting due to its ability to detect subtle enhancement differences and quantify iodine concentration with high precision. Compared to DECT, PCCT offers superior energy resolution, reduced noise, and improved contrast to noise ratios. These factors contribute to better visualization of bowel wall perfusion abnormalities. [3]
Recent studies demonstrate that PCCT iodine mapping can detect ischemia earlier than conventional CT, particularly in cases where mural enhancement abnormalities are too subtle for standard detectors. Shaheen et al. reported improved visualization of non-enhancing segments in cases of bowel infarction using PCCT iodine maps. [4] Similarly, Giraud et al. showed that iodine quantification improves sensitivity in suspected small bowel ischemia. [2]
This case further supports these findings: while conventional PCCT images appeared inconclusive, iodine maps revealed a complete lack of enhancement in a diseased segment, providing diagnostic clarity. This timely detection enabled urgent surgical intervention, preventing perforation and further complications.
Fibrotic bands arising from the uterus are exceptionally uncommon. Although pelvic adhesions after Caesarean delivery are common, [5] fibrotic uterine origin bands producing strangulating obstruction are sparsely documented. Closed loop obstruction from such bands can produce rapid onset ischemia despite preserved mesenteric perfusion, making imaging-based perfusion assessment essential.
The ability of PCCT to distinguish perfused from non-perfused loops makes it uniquely suited for such complex scenarios where mechanical obstruction may not show overt CT signs. This case underscores the emerging role of PCCT as a powerful early diagnostic tool in emergency abdominal radiology.
Photon-counting detector CT (PCCT) provides several advantages over conventional energy-integrating detector CT (EID-CT), particularly for iodine mapping, due to its improved spatial resolution, spectral accuracy, and noise performance. The following key advantages are supported by peer-reviewed literature: The first key advantage is the Improved spatial resolution, achieved through smaller detector pixels and direct photon conversion, resulting in substantially higher spatial resolution, improving visualization of fine structures and small lesions. [6] In addition, PCCT provides superior contrast resolution and iodine quantification as energy-resolving detectors allow highly accurate iodine mapping and improved material decomposition, enhancing lesion detection and characterization. [7,8] The technology also reduces image noise and improved dose efficiency by minimizing the electronic noise and improves contrast-to-noise ratio (CNR), enabling lower radiation dose or lower iodine contrast volumes while maintaining diagnostic quality. [9,10] Moreover, several clinical studies have demonstrated a 20–25% reduction in iodinated contrast media usage with equal or superior diagnostic quality. [10] PCCT further improves spectral imaging, artifact reduction, and material discrimination, as the intrinsic multi-energy data enabling better separation of iodine, calcium, and soft tissue, and reducing beam-hardening and metal artifacts. [7, 10] Finally, these advantages translate into enhanced performance across multiple clinical applications, as PCCT improves chest, cardiac, abdominal, musculoskeletal, and pediatric imaging through combined gains in contrast, resolution, and dose efficiency. [9]
"PCCT provides significant advantages in this setting due to its ability to detect subtle enhancement differences and quantify iodine concentration with high precision."
Al Ahli Hospital Doha, Qatar
"PCCT iodine mapping enabled early recognition of small bowel ischemia secondary to a rare uterine fibrotic band."
Al Ahli Hospital Doha, Qatar