PMC8130677_01
(a) 99mtechnetium-methylene diphosphonate three-phase c perfusion-phase skeletal scintigraphy in posterior view shows abnormal perfusion in the region corresponding to the right sacroiliac joint. (b) 99mtechnetium-methylene diphosphonate blood-pool phase scintigraphy in posterior view shows mild tracer pooling in the right sacroiliac region. (c) Increased tracer uptake in the delayed phase seen in the region corresponding to the right sacroiliac region (bold arrow) and symphysis pubis (arrow). (d) 99mtechnetium-methylene diphosphonate delayed whole-body sweep showing increased tracer concentration in the sacroiliac joints (R > L, marked by bold arrow) and mildly increased tracer concentration was seen in the symphysis pubis (arrow). Injection site is noted near the right elbow
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F1
The scan revealed increased perfusion in the first pass and mild tracer pooling on the second pass in the right sacroiliac region [Figure 1a and b]. The static study [Figure 1c] and delayed whole-body sweep [Figure 1d] showed increase in tracer concentration in the sacroiliac joints (R > L), and mildly increased tracer concentration was seen in the symphysis pubis.
(a) Single-photon emission computed tomography with low-dose screening computed tomography of the pelvic region showing increased tracer concentration in the articular margin erosions with adjoining sclerosis in bilateral sacroiliac joints. (b) Computed tomography scan acquired with single-photon emission computed tomography for attenuation correction showing soft-tissue involvement in the right sacroiliac joint. (c) Single-photon emission computed tomography with low-dose screening computed tomography of the pelvic region showing increased tracer concentration corresponding to healed fracture in the left inferior pubic ramus
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F2
It showed increased tracer concentration in the articular margin erosions with adjoining sclerosis in bilateral sacroiliac joints (Right > Left) with minimal soft-tissue component on the right side [Figure 2a and b]. Old healed fracture was noted in the left inferior pubic ramus [Figure 2c].
(a) STIR coronal section of the pelvis showing bilateral sacroiliitis with peripherally enhancing collection around bilateral sacroiliac joints (Right > Left). (b) T1-weighted magnetic resonance imaging image showing bilateral sacroiliitis with peripherally enhancing collection around bilateral sacroiliac joints (Right > Left)
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F3
T2 SPAIR axial section showing hyperintensity in the right iliopsoas muscle
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F4