Bone Lesions (Holes): Differential Diagnosis from Osteoporosis to Malignancy

"Holes in bones" on imaging represent lytic lesions. Differential includes:

Metabolic/Inflammatory

• Osteoporosis: Diffuse porosity, not discrete holes.
• Osteomyelitis: Lytic focus + sequestrum, involucrum, periostitis; fever, elevated CRP.
• Avascular necrosis (AVN): Subchondral collapse (crescent sign); femoral head common.

Neoplastic

• Primary bone tumors: Multiple myeloma (punched-out), osteosarcoma (mixed lytic/sclerotic + sunburst), Ewing sarcoma, chondrosarcoma.
• Metastases: Breast, lung, prostate, kidney, thyroid → "punched-out" (lytic) or blastic.

Other

• Paget's disease: Mixed lytic/sclerotic, expanded bone, cortical thickening.
• Fibrous dysplasia: Ground-glass matrix, cortical thinning.
• Brown tumors (hyperparathyroidism): Osteoclastic resorption.
• Enchondroma/Giant cell tumor: Benign lytic lesions.

Workup

History, exam, labs (Ca, PTH, ALP, SPEP/UPEP, markers), imaging (XR, MRI, CT, bone scan, PET), biopsy if indicated. Multidisciplinary tumor board for suspected malignancy.