The differential diagnosis includes rhabdomyosarcoma, nodular fasciitis, paraganglioma, granular cell tumor, myoepithelioma, ectomesenchymal chondromyxoid
tumor, and aural polyp.
The cells constituting myoepithelial tumors demonstrate a spectrum of cytomorphology including epithelioid, histiocytoid, plasmacytoid, or spindled, with little matrix or in the background of a chondromyxoid
or collagenous/hyalinized stroma.
There are two forms of ABC- Primary (Occurring de novo) and secondary which complicates other benign and malignant conditions like-Fibrous Dysphasia, Osteoblastoma, Osteosarcoma, Chondroblastoma, Giant Cell tumour, chondromyxoid
fibroma, non-ossifying fibroma.
The epithelial architectural pattern was studied with respect to the ducts, trabeculae, solid nests while mesenchymal component was divided into myxoid, chondroid and chondromyxoid
Two components are required to reliably make a diagnosis of PA: myoepithelial cells and chondromyxoid
Histochemical reaction for PAS in the chondromyxoid
tumor stroma was negative (Fig.
Differential diagnoses of IOG cysts include: aneurysmal bone cyst, osteoblastoma, giant cell tumour, fibrous dysplasia, chondromyxoid
fibroma, osteiod osteoma, rheumatoid arthritis, simple bone cyst, enchondroma, chondroblastoma, and subchondaral bone cyst.
Morphologically, the differential diagnoses of this tumour includes chondromyxoid
fibroma and myxoid liposarcoma.
The differential diagnosis includes an eurysmal bone cysts, chondroblastoma, chondromyxoid
fibroma, giant cell reparative granuloma, nonossifying fibroma, Langerhans' cell histiocytosis, synovial sarcoma, and high-grade central osteosarcoma.
Differential diagnosis of the findings included benign fibrous lesions of bone-like non-ossifying fibroma and odontogenic fibroma, myxoma and chondromyxoid
fibroma or even fibrosarcoma.
In the differential diagnosis chondromyxoid
fibroma and osteitis fibrosa cystica were considered (Figs 1 a & b).
Lorenz diagnosed a chondromyxoid
fibroma, a non-malignant bone tumor that usually occurs in the limbs and feet.