Case of the Week 105 24 year old male presented to the practice of Daniel Mühlemann, DC (Zürich) with an insidious onset of knee pain for the past 6 weeks.

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Presentation transcript:

Case of the Week year old male presented to the practice of Daniel Mühlemann, DC (Zürich) with an insidious onset of knee pain for the past 6 weeks. He also complained of pain at night. The clinical question was pes anserine bursitis vs. an osseous lesion.

What are the abnormal findings? What is the DDX? What should be done next?

Answers Abnormal findings: Abnormal findings: There is a multi-lobulated lytic lesion in the proximal metaphysis of the tibia. In places it is well marginated (superiorly) while in others the borders are not that sharp. The cortex is intact, there is no periosteal reaction and no soft tissue mass. There is a multi-lobulated lytic lesion in the proximal metaphysis of the tibia. In places it is well marginated (superiorly) while in others the borders are not that sharp. The cortex is intact, there is no periosteal reaction and no soft tissue mass. DDX: DDX: Brodies abscess vs. Giant Cell Tumour (GCT) vs. Aneurysmal bone cyst (ABC) vs. low-grade Osteosarcoma. However, a GCT typically extends into the epiphysis to the articular surface and an ABC is very expansile. Brodies abscess vs. Giant Cell Tumour (GCT) vs. Aneurysmal bone cyst (ABC) vs. low-grade Osteosarcoma. However, a GCT typically extends into the epiphysis to the articular surface and an ABC is very expansile. What should be done next? What should be done next? Laboratory evaluation and MRI. Laboratory evaluation and MRI.

MRI slices (and on next slide) T1 Coronal slice T1 axial slice Contrast Enhanced fat supressed axial slice

What are the abnormal findings? What is the likely Diagnosis? Contrast enhanced fat suppressed sagittal slice T 2 weighted sagittal slices

Answers Abnormal findings: Abnormal findings: The multi-lobulated lesion previously noted appears well marginated on the MRI slices and is low signal intensity on T1 with high signal on T2 weighted images. The multi-lobulated lesion previously noted appears well marginated on the MRI slices and is low signal intensity on T1 with high signal on T2 weighted images. It enhances with contrast, particularly the border. It enhances with contrast, particularly the border. Bone marrow edema is noted surrounding the lesion (low signal on T1 and high signal on the contrast enhanced fat suppressed slices). Bone marrow edema is noted surrounding the lesion (low signal on T1 and high signal on the contrast enhanced fat suppressed slices). Contrast enhancement of the soft tissues anterior and medial to the proximal tibia is noted. Contrast enhancement of the soft tissues anterior and medial to the proximal tibia is noted. Likely Diagnosis: Likely Diagnosis: Brodies Abscess. Brodies Abscess.

Laboratory Results A CBC (complete blood count), Alkaline Phosphatase, LDH, and C-Reactive protein (CRP) were ordered. A CBC (complete blood count), Alkaline Phosphatase, LDH, and C-Reactive protein (CRP) were ordered. The only abnormalities found were: The only abnormalities found were: CRP = 28 mg/l (normal is up to 5) CRP = 28 mg/l (normal is up to 5) ESR (sedimentation rate) = 36 mm/h (normal is up to 8) ESR (sedimentation rate) = 36 mm/h (normal is up to 8) The WBC along with the differential were within normal limits. The WBC along with the differential were within normal limits.

Follow Up The patient was referred to an Orthopaedic surgeon. The patient was referred to an Orthopaedic surgeon. This was a proven case of Brodies abscess. This was a proven case of Brodies abscess.