Rare retro-patellar multiple osteochondromas in patellar tendon: A case report

Area of Science:

• Orthopedics
• Skeletal Biology
• Tumor Pathology

Background:

• Osteochondromas (OCs) are common benign bone tumors originating from the periosteum during enchondral ossification.
• Retro-patellar osteochondromas represent a less common subtype, occurring within or adjacent to the knee joint.
• These lesions can manifest in various intra-articular, intra-tendon, or peri-articular locations.

Observation:

• A 19-year-old male presented with a palpable mass and swelling in his left knee.
• Clinical suspicion for a bone tumor was raised due to the presenting symptoms.
• Diagnostic imaging, including X-rays, was performed to evaluate the knee abnormality.

Findings:

• Radiographic examination revealed an exostosis consistent with osteochondroma.
• Histopathological examination of the resected mass confirmed the diagnosis of retro-patellar osteochondroma.
• The lesion's location posterior to the patella was a key diagnostic feature.

Implications:

• This case underscores the importance of considering osteochondromas in the differential diagnosis of knee masses, even in unusual locations.
• Accurate diagnosis through imaging and histopathology is crucial for appropriate management of retro-patellar osteochondromas.
• Understanding the varied presentations of osteochondromas aids in clinical decision-making and patient care.