Basal cell carcinoma is usually a straightforward diagnosis, however, in patients with tattoos, the lesson may be blurred. Notice the red pigment adjacent to the lesion!

25 yo. Skin nodule trunk. Diagnosis from 1 pic? or #TooCloseToDiagnose? Hint: these are NOT Touton cells! Answer ✅ youtu.be/5glY-kBjJmM?si… Digital slide & immunostains: kikoxp.com/posts/8455. More info about pigment here: kikoxp.com/posts/8457. #pathology #pathologists

33 M ear canal. Recurrent violaceous nodule. WSI digital slide: kikoxp.com/posts/21691 IHC: kikoxp.com/posts/21693 Answer: youtube.com/watch?v=tbFUG_… #pathology #pathologists #pathTwitter #dermpath #dermatology #dermatologia #dermtwitter #BSTpath

Purpuric Dermatoses #TheJPCNCR #PathTwitter

TERRIFYING case! 80 M pink papule nose. Answer ✅ youtu.be/Ok5axr0NDgY?si… Digital slides & IHC: kikoxp.com/posts/21794 Clinical photo (I would've NEVER guessed dx from this!): kikoxp.com/posts/21799 #pathology #pathologists #pathTwitter #dermpath #dermatology #dermtwitter

75 yo man. Erythematous thickened multinodular skin on nose. Diagnosis? Answer ✅ youtu.be/M7OLI3UlwMI?si… WSI digital slide: kikoxp.com/posts/8160 #pathology #pathologists #pathTwitter #dermpath #dermatology #dermatologia #dermtwitter

Skin ulcer biopsy. Your diagnosis? Answer ✅ youtu.be/-L_yJiSQ9bY?si… Pic from my #dermpath survival guide book by Innovative Science Press: bit.ly/2Te2haB. #pathology #pathologists #pathTwitter #dermatology #dermatologia #dermtwitter #IDpath #microbiology

16 yo Scalp. Answer ✅ youtube.com/watch?v=7M7Ol5… Another perfect example🔬: kikoxp.com/posts/17171 WSI (different case)🔬: kikoxp.com/posts/13673 #pathology #pathTwitter #dermpath #dermatology #dermtwitter

67 yo F. 1.2 cm nodule anterior thigh. Clinical dx: lipoma. CD10+. Your diagnosis? (It's NOT RCC!) Answer ✅ youtube.com/watch?v=VXpcFY… Digital slide: kikoxp.com/posts/8441 #pathology #pathologists #pathTwitter #dermpath #dermatology #dermtwitter #BSTpath

Skin biopsy. A pathology classic. One pic only. Answer ✅ youtu.be/yfs42lmFZfU #pathology #pathologists #pathTwitter #dermpath #dermatology #dermatologia #dermtwitter #usmle

Skin nodule in elderly adult. Hint: Spindled shape is uncommon for this tumor, but otherwise the nuclear features are classic for this entity. Answer ✅ youtu.be/zq51HMJNoZ4?si… #pathology #pathologists #pathTwitter #dermpath #dermatology #dermatologia #dermtwitter

30 F. Mass in lumen of femoral vein. Diagnosis? Answer ✅ youtu.be/9pBgqdjgEgY?si… Digital slides: kikoxp.com/posts/21727 Immunostains: kikoxp.com/posts/21729 #pathology #pathTwitter #dermpath #dermatology #dermatologia #dermtwitter #BSTpath

Pitfall alert! Dedifferentiated liposarcoma can aberrantly stain with CD117, which may be problematic in biopsy from an intra-abdominal mass. Resection showed clearcut abrupt transition between well-differentiated and dedifferentiated liposarcoma. #TheJPCNCR #PathTwitter

80 M scalp. Negative: SOX-10, p40, CK5, desmin, ERG. Your topline diagnosis? Any comment you'd add? Answer ✅ youtube.com/watch?v=mmuehu… Digital slide: kikoxp.com/posts/6840. Sample #pathology report: kikoxp.com/posts/5193 #pathTwitter #dermpath #BSTpath #dermtwitter

PENOSCROTAL POROKERATOSIS Well-developed cornoid lamellae, with acanthosis and patchy lichenoid infiltrate. pubmed.ncbi.nlm.nih.gov/32401728/ #dermpath #GUpath #PathX #PathTwitter

AMYLOID As Guannan Zhang ，张冠楠，MD, PhD mentioned, solitary amyloidomas at this site are often not associated with systemic amyloidosis. However, if resources allow, amyloid subtyping by mass spec should be done to explore it. If not, skin or fat pad bxs could be done. This pt had

Rare (in my practice) & classic! Only case in my collection. Foot nodule 50 M. Answer ✅ youtu.be/g7PlwuIDs7U?si… Digital slide: kikoxp.com/posts/2338 Clinical pics: kikoxp.com/posts/2341 #Pathology #pathTwitter #dermpath #dermatology #dermatologia #dermtwitter

3cm subcutis mass from posterior neck of adult. Diagnosis? More pics: kikoxp.com/posts/16001 Answer ✅ youtu.be/h7oxx9g7DH4?si… #BSTpath #pathology #pathologists #pathTwitter #dermpath #dermatology #dermatologia #dermtwitter

Spitzoid Melanoma In An Older Patient | Dermpedia dermpedia.org/programs/spitz… #pathology #dermpath

Can you make diagnosis from one pic, or is it #TooLowToDiagnose? (hint: all that palisades is not schwannoma) More pics: kikoxp.com/posts/16056 Answer ✅ youtu.be/FaWOulKWEPQ?si… #pathology #pathologists #pathTwitter #dermpath #dermatology #BSTpath #dermtwitter