Histopathologic Findings
| | | | | | | Table 8-11 Differential Diagnosis | | | Finding | | Seen in: | | | Deep lesion
(no epidermis/upper dermis seen) | | Rheumatoid nodule, malignant fibrous histiocytoma, neurothekeoma, paraffinoma, giant cell tumor of tendon sheath, nodular fasciitis, myxoid liposarcoma, angiolipoma, angioleiomyoma, ± neurilemmoma, gout, hibernoma | | | Painful tumors: BLEND AN EGG | | Blue rubber bleb, leiomyoma, eccrine spiradenoma, neurilemmoma, dermatofibroma, angiolipoma, neuroma, erythema nodosum, endometriosis, glomus tumor, glomangioma | | | Polypoid | | Accessory tragus, digital fibrokeratoma | | | Acral | | Digital fibrokeratoma, verruca, supernumerary digit, amputation neuroma, myoid cyst | | | Minimal change | | Tinea versicolor, macular amyloidosis, ichthyosis vulgaris, telangiectasia macularis eruptiva perstans, vitiligo, urticaria | | | Squared off (boxcar) biopsy | | Scleredema, pretibial myxedema, morphea, advanced NLD | | | | | |
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