BST

Question 1

Sarcomas with lymph node metastasis

Answer 1

Clear cell sarcoma
Epithelioid sarcoma
Alveolar rhabdomyosarcoma
Synovial sarcoma
Angiosarcoma

Question 1

Common locations of inflammatory myofibroblastic tumor

Answer 1

Mesentery, omentum, retroperitoneum most common
Can also happen in H&N, lung, bladder, gyne, CNS

Question 2

Histologic patterns of inflammatory myofibroblastic tumors

Answer 2

Spindle/stellate cells with loose myxoid stroma
Compact spindles in fascicles/storiform pattern
Hypocellular sclerotic matrix

Question 3

Sites of embryonal rhabdomyosarcoma

Answer 3

GU (bladder, prostate, peritesticular soft tissue)
H&N (orbit, oropharynx, sinus, tongue, middle ear)
Biliary tract

Question 4

CK+ sarcomas

Answer 4

Epithelioid sarcoma
Desmoplastic small round cell tumor
Chordoma
Biphasic synovial sarcoma
Adamantinoma-like variant of Ewing sarcoma
Epithelioid hemangioendothelioma

Question 5

Cd34+ non-vascular tumors

Answer 5

SFT
DFSP
GIST
Epithelioid sarcoma
Nerve sheath tumors
Myeloid neoplasms

Question 6

Possible lines of differentiation in spindle cell tumors

Answer 6

Muscle
Nerve sheath
Vascular
Myofibroblastic
FIbrohistiocytic
Adipocytic
Others: GIST, SFT, SS, Carcinoma, melanoma

Question 8

Grading treatment effect in Ewing’s sarcoma

Answer 8

Grade 1: 0% necrosis
Grade 2A: <50% necrosis
Grade 2B; 50-95% necrosis
Grade 3: 96-99% necrosis
Grade 4: 100% necrosis

Question 9

Most common histologic patterns of conventional osteosarcoma

Answer 9

Osteoblastic
Chondroblastic
Fibroblastic
Telangiectatic is rare
Small cell

Question 10

Subtypes of surface osteosarcoma

Answer 10

Parosteal
Periosteal
High grade surface osteosarcoma