.M# Metaphysis# Diatal end of humerus is most common site# Purely lytic eccentric radiolucency# Expansile ballooning lesion with/ without Soap-bubble pattern# Rapid progression within 6 weeks to 3 months# Sclerotic inner portion# Tumor respects epiphyseal plate.Fluid-fluid/ Fluid-blood levels20--30% recurrence rateHEMAN- GIOMA# 4th--5th decade;# M:F = 2:1Vertebra (28% of all skeletal hemangiomas) in lower thoracic/ upper lumbar spine.Vertebra with vertical striations i.e. Corduroy/ Accordion vertebra"Polka-dot" appearance on CT# Mostly cavernous;# In spine Percutaneous Vertebroplasty is a good Rx option.FD# Usually early adolescence- M=F# Usually diaphyseal.# Ribs, femur, tibia, jawbones, calvaria, and humerus are most commonly affected, in descending order.# Well-defined mixed-density lesion"Ground-glass" appearance or smoky matrix# Benign tumor# Usually asymptomatic# Monostotic form does not evolve into polyostotic form.# Polyostotic form accounts for 27% of cases, Monostotic form 70% cases and 3% are seen as a part of McCune-Albright syndrome.# In polyostotic form rarely transformation into osteosarcoma/ malignant fibrous histiocytom may occur.">